"That ticking sound is pretty normal in overhead cam engines... Try test driving a DOHC Integra, or Civic SI..."
I had a civic (DX), and it sounded like a sewing machine kind of ticking. Sometime I wondered whether it was the valvetrain or the fuel injection.
"Folks, the answer is neither. There are no valve lifters at all. This is a dual overhead cam engine and there are devices called "roller followers" that transmit movement from the camshaft to the valves...my two cents."
#8180 by burdawg On the bench seat issue: "I too generally prefer a split bench to buckets, as long as it has some contour to each side, not just a flat seat all the way across like my Suburban."
Yay! At least someone has one. I'd prefer a big, flat, vinyl bench myself. Tons of stuffing, and springy.
Got to thinking about this some more... The vast majority (all?) modern car engines still use some form of hydraulic lash adjustment somewhere between the cam lobes and the value stems. This is necessary to allow for thermal expansions and to keep the valve train quiet. So you could still have some ticking on cold start especially after a long period of non-use if the hydraulic adjusters lose their oil, until replenished.
The story is different on bikes. Many use "shim under bucket" direct valve activation (in concept like solid lifters in the old performance pushrod engines). This is why they require frequent adjustment. One of my sport bikes wanted valve adjustment every 6K miles!
The web's a wonderful thing. Check out http://delphi.com/automotive/engine/valve_train/ for lots of information about valve trains (Delphi is GM's parts supplier). In particular http://delphi.com/pdf/eandepdfs/ValvTran.pdf page 3 shows a nice view of a roller follower with an hydraulic lash adujster. The adjuster (left purple thing) keeps the follower in contact with the cam by taking up any slack between the roller and the cam lobe (the cam would be on top of this assembly). Non-gearheads can ignore this post!
I'm the proud owner of both a 2002 Bravada (I haven't posted here in awhile, though), and a shiny new iPod MP3 player. I own a cassette deck adapter (from the old CD player I had way back in the early '90s) which the Bravada stereo sees as a broken tape, and immediately ejects. I'd looked at the iRock FM transmitter, but I'd rather not use one of those as I've heard mixed reviews of it and I would rather not deal with batteries.
What I'm looking at is a FM Modulator like this one (http://www.themindfactory.com/Products/PLL-1_FM/pll-1_fm.html), or perhaps a different brand. Has anyone here tried one of these devices, and if so what kind of experience have you had? Is this a add-in that a fairly competent person like myself can do, or would I be better off handing it off to the pros?
Following up on my earlier question, I just wondered if anyone knows if the 22-gallon fuel tank is being installed in Envoys yet. Is this designated on the window sticker or someplace else? I'm in the market in the next three weeks, and don't really want to buy an Envoy with the smaller 19-gallon tank if the larger tank is on vehicles at...or on their way to...dealers. Thanks.
It would be really nice if the new 22 gallon tank could be put into the existing triplets. I hate getting gas every other day! I do about 600 miles per week commuting.
Non-hydraulic valve actuators were not confined to muscle cars. My '91 Civic, '87 Toyota FX-16, and '80's Corollas all had non-hydraulic valve actuation. The Civic and Corolla used threaded studs to adjust valve clearance, while the FX-16 used shims. All needed to be checked every 30,000 miles. I liken this to solid lifters.
We have a 2002 TrailBlazer EXT with 3,000 miles and have had good luck so far. After warm up, every time the tach revs to and past 1000 rpm, a loud strange vibration (with noise) occurs. If you hold the rpm's on 1000, the vibraion continues constantly. It does not matter if the A/C is on or not. It comes from just under the top of the dash to the right of center. Our dealer is 90 miles away so I am trying to take care of this problem myself. I've taken out the glove box and removed the lower heater area cover. When you pull on the lower heating duct, the vibration gets quieter, but does not go away. I can't get my hand to the top of or behind the heating assembly under the dash, there is not enough room. Any other way to get in the dash without taking out the radio? This vibration / rattle is driving me nuts! Anybody else had this low rpm dash vibration? If so, how did you take care of it?
I think this may be related to a pipe or tube resting against the firewall and transmitting the "vibration" into what seems like the dash. Check under the hood for cooler, heater, p/s lines or something metallic contacting the firewall.
The window sticker on my 2003 Bravada also does not list gas tank size. However, the GMC Envoy website under "specifications" lists the fuel tank capacity of the 5 passenger Envoy as 22 gallons. I don't think GMC would have posted that if they hadn't started cranking them off the assembly line yet.
I now have the vibration in that gas pedal all the time and much more in 2nd gear. Before, it was only noticable between 55-60 MPH. It also feels like the whole vehicle has a low rumble. I saw someone post the same issue awhile back and was wondering if anyone else has this problem or a fix. It just started to happen when the temp. here was in the 20-30 degree range and the dealer just replace the (recall) fuel filter line clip(may have nothing to do with anything). Mine is a 2002 TB LS, 4WD, w/ 3.7 gear ratio, 11,000 miles,and 11/01 manufacture date. I've never experienced this vibration in any other vehicles gas pedal and I just lived with it in the 55-60 mph range but now it is driving me nuts since it is happening all the time!
Hey ross1962, I think maybe "babyshoes" meant DIAPERS. I tried going beyond the factory recommended time to change a diaper on my son and it didn't cut it either.
Worse yet, can you imagine trying to change one on the fly? At 300 MPH with a vibrator running wild on the dash - jet engine roaring in your ear - mirrors spinning in cirlces - hydraulic lifters ticking away indicating another time bomb on its way down the tailpipe.
I think you're right, it's getting kinda kinky here.
I also experienced more vibration than I am used to in the gas pedal today at 55mph (3.71 rear end). The temperature was around 35 degree f. The vibration wasn't as bad during the summer months. I mentioned it to the dealer, but they couldn't find anything. I found that odd since I can duplicate it 98% of the time at 55 mph.
Took my '02 Bravada in today for service on the AWD. Problem was that every time vehicle made tight turns the AWD kicked into 4WD mode. This happened almost every time I parked, and parking garages were absolute hell on the AWD. Lately the problem started showing up while driving normally and making sharp right turns.
The service dept applied a "temporary fix". Using a Tech2, they reprogrammed the ATC to "2 Speed Active & Repeat Steps 3 Times". This seems to have stopped the problem from occuring (1st time in a long while I've been able to back into my garage without being in 4WD mode). I wonder though if the AWD will kick in now in the snow.
The service rep said that GM was aware of the problem and was working on a permanent engineering solution. I asked if I was on a waiting list for the fix and his reply was that he thought that there was going to be a recall for this problem. Lets hope its sometime soon.
He also said that the problem may reoccur in the future, but didn't give any indication of what would trigger its reoccurrence.
I have been 'enjoying' my cassette adapter for some time in my Envoy. I had to be persistent -- it would eject the adapter a few times, but eventually it stayed in. Also, I suggest that you turn on the iPod and have it play some tunes while putting the tape adapter inside. The electronics may sense the signal and assume that the tape is in correctly (?).
I elected to go this route after realizing that an aftermarket stereo system would be a real pain -- installation of a special OnStar interface or relocating the radio seems expensive, possibly messy, and would probably get the service manager on my case when I bring in my Envoy for electrical problems.
I'm sure you'll find that the fidelity of the tape adapter is *much* better to that of an FM modulator. Any decent FM adapter will require that you put something between the radio and the FM antenna, so an FM adapter is not truly a wireless solution, either...
Also, to whom who it may concern, I've had my Envoy for a year now, and have put 7,300 miles on it. No major problems yet. Minor annoyances, such as the shift lock not unlocking, the 4WD selector goes on the fritz some times (dealer can't reproduce problem), and the automatic HVAC pretty much sucks -- thank goodness for seat heaters.
I'm still keeping the Envoy, but have been eyeing the Hyundai Santa Fe for my sister.
I just installed a pair of Bosch MicroEdge Excel blades on my TB a couple of weeks ago. The wipe quality seems to be far superior to the OEM blades that I had since delivery 04/01. BTW, I never had a problem with the OEM blades freezing last winter and I decided not to install winter wipers this coming winter for fear of the wipers chattering on the glass at highway speeds. NOTE: The Owner's Manual lists the wrong wiper size. Autozone had the correct size in their computer.
I also have a vibration coming from the floor board and gas pedal. Dealer says he can't feel it but everyone else that sits in the driver's seat can. Very annoying!!
Well, here in San Diego, it has rained about 1 inch total since I got my TB in April '02. So, I'm thinking of just taking them off. They flap around too much at speeds over 300 mph anyway!
I have a 2002 Trailbalzer LT with the following problem: When I first start the vehicle in the morning on a cold day (50 F or less), the engine sounds like it's racing, the tach shows 1500rmp, and the truck has no power. I live on a hill and it can barely move up when I step on the gas. In about 5 minutes time, power is restored and then it drives just fine for the rest of the day. This repeats every morning if it's cold. I took it to the dealer and left it overnight for them to check in the morning, but they told me they could not reproduce (sounds familiar?). Has anyone experienced similar symptoms? Any idea what it might be? Some bad electronic component maybe that's temperature dependent or? Any help is appreciated.
This engine roar happens occasionally and is normal. It has to do with built up fluid in the fan clutch (or something like that) when motor was shut off. The r.p.m. and roar go back to normal after a few minutes. GMC/Chevy trucks have been doing it for years. My ole 93 GMC Sonoma did the same thing. No harm what so ever to the motor or fan.
I had the TB in for reprogramming twice in the year and a half I owned it. Some of the folks on this site do not always differentiate between the fan noise which has been found on other GM trucks and the fan noise/lack of power issue which is unfortunately common to the triplets. The reprogramming of the TB never worked and GM finally did come out and say it was "normal". I live in a residential neighborhood and could limp along the side streets for 5 minutes until the leaf blower like sound subsided and the vehicle could finally get past 30 mph. If one had to merge quickly on a busy street from startup that could be a safety issue unless one wanted to sit idle for 5 minutes. Once GM told me this was "normal", I traded the vehicle in with 21,000 miles on it. I found that initially the problem was in colder weather but as time progressed the outside temperature really did not matter as it happened frequently in the summer months.
Just had the encoder motor replaced for the second time. I had to wait for about a month for the redesigned unit. It's been a week and no problems yet. While GM wouldn't give me a loaner for the month of waiting for the redesigned part, the dealer did give me one for the day it took to replace it. The dealer was very supportive.
Just had the gas tank replaced it was leaking at the top of the tank,,,,, to see if u have a bad tank fill tank to the top then park the truck on a hill or incline,front of truck needs to be up hill take a flash light and look right where the filler tube goes into the tank it will be leaking right there.. now i need ur help still have the squeaks in stop and go traffic or when leaving a stop sign, dealer lubed up the bushings on the stableizer. when i drive the truck in the rain the noise is goneTo me almost feels like the springs in the front are squeaking as u give it gas and then slow down only happens at slow speed any one have a fix? Thanks in advance
Found a nice resource ofs list of TSBs for each of the triplets. Doesn't have full detail, but does list the TSB numbers that you can give your dealer:
I looked at just a few other SUVs for the number of TSB and recalls (mostly foriegn) and it seems like the Trailblazer has 3 times as many TSBs as the others for the same 2002 model year. Am I looking at this incorrectly?
1. the 2002 trailblazer is a first model year. Most new model year vehicles have more tsb's than later years.
2. G.M. Tends to be more proactive regarding TSB's Foreign manufacturers begrudginly list tsb's and usually fight on minor issues that GM would readily issue a TSB.
Also, keep in mind that many of the TB TSBs are not necessarily for problems with the vehicle. Some are just better procedures for certain maintenance routines.
I've never been entirely happy with the exhaust system on my Bravada, especially the large resonator. Not only does it reduce departure angle, but it also looks misplaced. In addition to the Bravada, I own a 2002 Jeep Wrangler... inline 6 and no where does it have one of these resonators in the exhaust system. Does anyone know why GM put one on our vehicles?
If you look around for aftermarket triplet exhaust systems, you'll find one from Borla, which is expensive I might add. If you look around for aftermarket Wrangler exhaust systems, you'll find many reasonably priced systems. I'm thinking that I should be able to purchase a cat back Wrangler exhaust system and retro fit it onto my Bravada, maintaining low noise, but yet, streamlining appearance. What does everyone think? Please provide comments.
I have a Wrangler, and had a local shop do a performance type exhaust for me for less than one of the premade types. You'd have better luck just going somewhere and telling them what you want. If it already has one muffler, you might be able to get away without another, or maybe a glasspack type for space savings. I got a Magnaflow, and it is pretty decent. Good luck.
I, for one, have owned many GM cars, from Buicks to Cadillacs to Chevrolets and I, unlike the charges here, know that cars do not behave perfectly all of the time.
I'm not so upset with my Bravada's terrible engine knocking and the license plate gasket thing (my build date is 4/01 and I have yet to see a fleck of paint off). HOWEVER, when a vehicle has the MAJOR problems as these have and GM fails to do a MAJOR recall to fix the problems, we need to act.
FOR EXAMPLE:
When you are going 60+ miles an hour on the freeway and your engine just quits on you (several times and it's happened to several posters here) that is a MAJOR problem.
When you come home from a trip and you go to start your vehicle in the parking lot (in the rain) and it will not start that is a MAJOR problem.
Referencing above: When Olds has to replace my battery for the second time because it is faulty and causing the "no start" problems that is a MAJOR problem.
When the rear suspension fails in your 3 month old vehicle and it has to be REPLACED with one that has many of the same problems, that is a MAJOR problem.
Here is my question to those of you who charge us "unhappies" with "whining".
What would your Chevrolet/GMC/Oldsmobile dealer say if you went in and told him that your current vehicle (without specifying the vehicle) does the above things? He would tell you "Sounds like you need a new vehicle!".
Pretty much decided... gotta see if the Honda dealer wants to deal though... Probably going to get an Accord('03 coupe) Can't justify keeping the truck... payments, gas, and insurance all go down... (gotta buy that house while the intrest is low..) and that ~$200 in savings will go a long way on a house...
I'd be twice as mad! Seriously, I don't expect any vehicle to be perfect, but 30 days out of service and 20 problems in the first 7 months is obscene. I could possibly deal with it if GM and the dealer would stop lying to me and admit this was a problem vehicle. The only way to get their attention is with a lawsuit. After the dealer fixed only 3 of the 8 problems from my last service visit, I called my GM corporate rep. No reply. Their next call was from the BBB to set up arbitration. If that doesn't work, a lemon lawyer will be next. I don't want to treat GM this way, but they have forced me to respond. It's a crappy way to run a business.
Weather is finally cold enough for the heating system to be needed for reasonable comfort. Has anyone noticed a cold air source that chills your left foot? I noticed it tonight driving in 37D temps with the auto climate control blowing heat. Likely an air leak somewhere. Anyone find a way to fix this?
well....sorry to say my LTZ has to go back in again for the heat issue. No real heat or anything outside very low temp/cool even in manual or auto modes with temp set at 86 or below.
worst auto system in four cars that I've had with it.
this will no doubt follow the car forever. I love the ride, but have become increasingly disappointed in the HVAC Sytem.
they fixed this last january with a reprogram and the AC worked in the summer. outside the fact that it zaps power from the motor, it was a good summer friend.
Agreed. Some people have had major and/or numerous problems with their vehicles. Some people have had no problems. Is it fair to say that the earliest purchasers have had the most problems? Maybe GM has a great continuous improvement process that has kept later purchasers from experiencing lots of these problems! (That was said sarcastically).
Some of the backlash on here, I believe, was due to the volume/repetitiveness of some of the more vocal critics and the existence of "problem" reports that were either trivial or naive (e.g. there's liquid dripping from under my car just forward of the passenger compartment).
By the way, I WOULD be concerned if my Bravada had "terrible engine knocking." Not cold start ticking or cheap gas pinging, but knocking. No engine should have that.
I agree that it should not have the loud knocking however the service people (who I've come to the decision are all college drop-outs who know nothing about automobiles) tell me this engine will do it regardless.
I cannot tell you how embarrassing it is to have people, both outside the vehicle and inside, ask me "what is wrong with your car" as I am accelerating and everyone around hears it.
I guess my whole problem with this vehicle is GM itself. I've been fortunate to have nearly flawless cars in the past (I had a 1998 Buick Century Limited for three years that NEVER went to the dealer except for the standard oil changes) and I hate to have the service people (not to mention the sales people WHAT KIND OF AN IDIOT SALES PERSON WOULD TELL SOMEONE THE BLACK DOTS ON THE WINDOW ARE FOR THE SATELLITE RADIO???????) look at me dumbfounded when I hand them TSBs or other knowledge about the car they know nothing about.
After 15 months and 19,000 miles, my Envoy has had an attack of the dreaded "engine fan roar." I had read all the posts about it as they came in, but was never able to comprehend how loud it really was, since my Envoy had never made a strange sound at all. It started yesterday. Well, let me tell you, it really does sound like a jet plane! Everyone who used to look at the Envoy as it passed (because it was so darn attractive) now looks to see what is causing that horrible jet sound! I activated On Star and had them run a diagnostic. They found a drivetrain PCM code, turned on the service engine soon light, and linked me to my dealer so I could tell them I was bringing it in right then. So, it is at the dealer now. I will report what happens. Those who have had this problem in the past, you now have my complete understanding and sympathy. I will be glad to get it fixed, as I still love my Envoy every time I drive it.
A rock finally found my Envoy's windshield and cracked it. No problem -- take it to the windshield replacement place and have a new windshield installed. New windshield looks great, no mess when it was installed. Even looks like the rain sensor is o.k. Unfortunately the windshield "flexes" over some bumps and is either moving around or rubbing against something -- it is making alot of noise that it never used to. Windshield replacement place wants me happy, so they are going to install another new windshield and mouldings. My questions: Shouldn't a replacement windshield be as "quiet" as the original? Am I expecting too much for a quiet windshield like the original?
Yes, it should be just like the original. It's either loose, or doesn't fit right. Also, the original equipment windshield is an assymetrical windshield in that the outer glass piece of the glass "sandwich" that the winshield is made from is thicker than the inner piece. So I would make sure they use the same type, or an OEM part.
Comments
I had a civic (DX), and it sounded like a sewing machine kind of ticking. Sometime I wondered whether it was the valvetrain or the fuel injection.
"Folks, the answer is neither. There are no valve lifters at all. This is a dual overhead cam engine and there are devices called "roller followers" that transmit movement from the camshaft to the valves...my two cents."
And there's the answer!
(I didn't know it was an OHC engine either!)
"I too generally prefer a split bench to buckets, as long as it has some contour to each side, not just a flat seat all the way across like my Suburban."
Yay! At least someone has one. I'd prefer a big, flat, vinyl bench myself. Tons of stuffing, and springy.
Please, GM, bring this back!
From the specs:
"Valve Lifters = Roller followers, with stationary hydraulic lash adjusters"
The story is different on bikes. Many use "shim under bucket" direct valve activation (in concept like solid lifters in the old performance pushrod engines). This is why they require frequent adjustment. One of my sport bikes wanted valve adjustment every 6K miles!
What I'm looking at is a FM Modulator like this one (http://www.themindfactory.com/Products/PLL-1_FM/pll-1_fm.html), or perhaps a different brand. Has anyone here tried one of these devices, and if so what kind of experience have you had? Is this a add-in that a fairly competent person like myself can do, or would I be better off handing it off to the pros?
-Josh
GAM
I only get them when I go transsonic! You might want to check your insulation. ;-)
tidester, host
Let me know if you find anything out about this. I also have an iPod, and would like to connect it to my TB. thanks!
minn_tb
Only on the EXT. The standard TB still has the 18.7 Gl tank.
What the !@#$$ are "wippers"?? Sounds kinda kinky!
Worse yet, can you imagine trying to change one on the fly? At 300 MPH with a vibrator running wild on the dash - jet engine roaring in your ear - mirrors spinning in cirlces - hydraulic lifters ticking away indicating another time bomb on its way down the tailpipe.
I think you're right, it's getting kinda kinky here.
The service dept applied a "temporary fix". Using a Tech2, they reprogrammed the ATC to "2 Speed Active & Repeat Steps 3 Times". This seems to have stopped the problem from occuring (1st time in a long while I've been able to back into my garage without being in 4WD mode). I wonder though if the AWD will kick in now in the snow.
The service rep said that GM was aware of the problem and was working on a permanent engineering solution. I asked if I was on a waiting list for the fix and his reply was that he thought that there was going to be a recall for this problem. Lets hope its sometime soon.
He also said that the problem may reoccur in the future, but didn't give any indication of what would trigger its reoccurrence.
I have been 'enjoying' my cassette adapter for some time in my Envoy. I had to be persistent -- it would eject the adapter a few times, but eventually it stayed in. Also, I suggest that you turn on the iPod and have it play some tunes while putting the tape adapter inside. The electronics may sense the signal and assume that the tape is in correctly (?).
I elected to go this route after realizing that an aftermarket stereo system would be a real pain -- installation of a special OnStar interface or relocating the radio seems expensive, possibly messy, and would probably get the service manager on my case when I bring in my Envoy for electrical problems.
I'm sure you'll find that the fidelity of the tape adapter is *much* better to that of an FM modulator. Any decent FM adapter will require that you put something between the radio and the FM antenna, so an FM adapter is not truly a wireless solution, either...
Also, to whom who it may concern, I've had my Envoy for a year now, and have put 7,300 miles on it. No major problems yet. Minor annoyances, such as the shift lock not unlocking, the 4WD selector goes on the fritz some times (dealer can't reproduce problem), and the automatic HVAC pretty much sucks -- thank goodness for seat heaters.
I'm still keeping the Envoy, but have been eyeing the Hyundai Santa Fe for my sister.
Regards,
Jeff
what replacement WIPER BLADES do you guys like? Winter is coming and these 2 month old WIPER BLADES aren't going to cut it.
So, I'm thinking of just taking them off.
They flap around too much at speeds over 300 mph anyway!
Has anyone experienced similar symptoms? Any idea what it might be? Some bad electronic component maybe that's temperature dependent or?
Any help is appreciated.
Mike
now i need ur help still have the squeaks in stop and go traffic or when leaving a stop sign, dealer lubed up the bushings on the stableizer. when i drive the truck in the rain the noise is goneTo me almost feels like the springs in the front are squeaking as u give it gas and then slow down only happens at slow speed any one have a fix? Thanks in advance
2002 GMC Envoy 4WD:
http://www.alldata.com/TSB/23/0223BGJ2.html
2002 GMC Envoy 2WD:
http://www.alldata.com/TSB/23/0223BFJ2.html
2002 Chevy Trailblazer 2WD:
http://www.alldata.com/TSB/11/0211AVJ2.html
2002 Chevy Trailblazer 4WD:
http://www.alldata.com/TSB/11/0211AWJ2.html
2002 Olds Bravada 2WD:
http://www.alldata.com/TSB/44/024403J2.html
2002 Olds Bravada 4WD:
http://www.alldata.com/TSB/44/024404J2.html
1. the 2002 trailblazer is a first model year. Most new model year vehicles have more tsb's than later years.
2. G.M. Tends to be more proactive regarding TSB's
Foreign manufacturers begrudginly list tsb's and usually fight on minor issues that GM would readily issue a TSB.
Walter
Mike .T.
If you look around for aftermarket triplet exhaust systems, you'll find one from Borla, which is expensive I might add. If you look around for aftermarket Wrangler exhaust systems, you'll find many reasonably priced systems. I'm thinking that I should be able to purchase a cat back Wrangler exhaust system and retro fit it onto my Bravada, maintaining low noise, but yet, streamlining appearance. What does everyone think? Please provide comments.
I'm not so upset with my Bravada's terrible engine knocking and the license plate gasket thing (my build date is 4/01 and I have yet to see a fleck of paint off). HOWEVER, when a vehicle has the MAJOR problems as these have and GM fails to do a MAJOR recall to fix the problems, we need to act.
FOR EXAMPLE:
When you are going 60+ miles an hour on the freeway and your engine just quits on you (several times and it's happened to several posters here) that is a MAJOR problem.
When you come home from a trip and you go to start your vehicle in the parking lot (in the rain) and it will not start that is a MAJOR problem.
Referencing above: When Olds has to replace my battery for the second time because it is faulty and causing the "no start" problems that is a MAJOR problem.
When the rear suspension fails in your 3 month old vehicle and it has to be REPLACED with one that has many of the same problems, that is a MAJOR problem.
Here is my question to those of you who charge us "unhappies" with "whining".
What would your Chevrolet/GMC/Oldsmobile dealer say if you went in and told him that your current vehicle (without specifying the vehicle) does the above things? He would tell you "Sounds like you need a new vehicle!".
Read this: http://www.insidedenver.com/drmn/business/article/0,1299,DRMN_4_1486664,00.html
GAM
Has anyone noticed a cold air source that chills your left foot?
I noticed it tonight driving in 37D temps with the auto climate control blowing heat.
Likely an air leak somewhere.
Anyone find a way to fix this?
worst auto system in four cars that I've had with it.
this will no doubt follow the car forever. I love the ride, but have become increasingly disappointed in the HVAC Sytem.
they fixed this last january with a reprogram and the AC worked in the summer. outside the fact that it zaps power from the motor, it was a good summer friend.
will keep you posted.
tim
Some of the backlash on here, I believe, was due to the volume/repetitiveness of some of the more vocal critics and the existence of "problem" reports that were either trivial or naive (e.g. there's liquid dripping from under my car just forward of the passenger compartment).
By the way, I WOULD be concerned if my Bravada had "terrible engine knocking." Not cold start ticking or cheap gas pinging, but knocking. No engine should have that.
I cannot tell you how embarrassing it is to have people, both outside the vehicle and inside, ask me "what is wrong with your car" as I am accelerating and everyone around hears it.
I guess my whole problem with this vehicle is GM itself. I've been fortunate to have nearly flawless cars in the past (I had a 1998 Buick Century Limited for three years that NEVER went to the dealer except for the standard oil changes) and I hate to have the service people (not to mention the sales people WHAT KIND OF AN IDIOT SALES PERSON WOULD TELL SOMEONE THE BLACK DOTS ON THE WINDOW ARE FOR THE SATELLITE RADIO???????) look at me dumbfounded when I hand them TSBs or other knowledge about the car they know nothing about.
ARRRRGGGGHHHHH
I activated On Star and had them run a diagnostic. They found a drivetrain PCM code, turned on the service engine soon light, and linked me to my dealer so I could tell them I was bringing it in right then. So, it is at the dealer now. I will report what happens. Those who have had this problem in the past, you now have my complete understanding and sympathy. I will be glad to get it fixed, as I still love my Envoy every time I drive it.
Thanks.