Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Buick Rainier, Chevy TrailBlazer, GMC Envoy



  • tblazedtblazed Posts: 945
    Was reading the 4-03 Techlink Newsletter and noticed a revision about using silicone on the weatherstrips. Having tried one of the GM recommended products "SuperLube with Teflon®" on the door seals and finding it actually causes the body seals to STICK to the doors after it sets for about an hour, maybe they came to the same conclusion. Can someone provide the details of the "replacement" bulletin below?

     99-08-64-016A; replaces 99-08-64-016; Use of Silicone for Weatherstrip Maintenance; 2003 and Prior Passenger Cars and Trucks
  • tjpushtjpush Posts: 9
    My TB EXT(4wd 3.73 rear/locker) is about 3 months old with 3000+ miles on it. I am constantly getting 14-15 mpg commute and highway and I use 87 grade gas(w/ 10% ethonal) almost all the time. The best was 17 mpg when driving back from Chicago to St. Louis(late March). The worst was 13.5mpg local drive.

    I have the gas pedal vibrations from time to time esp. when going up a small incline at 40-55 mph speed with the engine laboring, but I discovered this by accident: I put in some 89 grade gas by accident 2 weeks ago, the engine sounds much quieter and I can hardly notice the vibrations now(though no improvements on mpg).

    Other than the "poor" gas mileage and some wind noise on hiway, I think it is doing very well.
  • blrmkrblrmkr Posts: 40
    I used to put gas from the cheapest station on the corner into my Triplet, usually the one with 10% ethanol. That was until a friend of mine at work with a C5 told me that if you spend $30k+ on a vehicle, why not spend a little a few cents more per gallon getting the "good" gas at a station like Mobil, Shell, etc.
  • tblazedtblazed Posts: 945
    "why not spend a little a few cents more per gallon getting the "good" gas.."

    Because ALL gasoline sold in the USA has to meet certain EPA standards for injector clogging, vaporization, combustion chamber deposits etc with mandated additives. Of course some brands tout their specific additive package like Chevron with "Techron". I go to the cheapest high volume station close to me to ensure I get fresh gas, and not the dregs from the bottom of an old tank at a lower volume name-brand station.

     16.2 city/ 22.4 Highway, 3.42 gears, 2WD TB after having the PCM recal. done one a month ago. Can't complain. Even performs better!

    If you have the choice where you are located, avoid the gas diluted with 10% ethanol. Ethanol does not burn with the same amount of energy per gallon and will effect power and fuel mileage.
  • rye78rye78 Posts: 16
    I live in the Chicago area and I agree with tblaze about the gas thing. But around here. I don't know of any gas station that sells gas without 10% ethanol. If anyone knows of a brand, let me know.
      The other question is this. I have an 02 TB LS 4x4 and it has 24K miles. It is almost two years old. I haven't had a single problem with mine yet (knock on wood). I was wondering where on the internet I could find all the computer upgrades, recalls, and/or information on any service that needs to get done to the truck. Like I said, I don't have any problems but it is more for preventative measures.
      If anyone wants to see my truck, its posted at "" In the trailblazer section mine is on the first page and says "Bert's TB. New K&N intake".
  • jnshelljnshell Posts: 2
    I have a 2002 Trailblazer 4WD. I'm having a problem with the transmission starting off in the wrong gear. This problem is very intermittent, and occurs usually on a cold start. When I start the car it revs extremely loud and fast, and even if I allow the car to warm up for over one minute, the revving goes on higher than normal. Then, when I put the vehicle in drive, it bogs down in a higher gear than first, and I can't get any power. I usually have to stop, put the car in park, and then back in drive once or twice to get first gear to engage. Also, when passing or accelerating on the freeway, I am losing power. When I first bought the vehicle it had lots of pep, now it is pretty much a dog. I've had it at the dealer four times, and they've changed the transmission fluid pressure valve once. The service manager told us that this is a problem that GM is aware of, even though they will deny it, and they are trying to determine if the problem is one that they should recall or not. Has anyone else had this problem, and if so, did you get it resolved? I am so frustrated I'm ready to call a lawyer and envoke the lemon law. I feel like the dealers and GM want me to believe this problem is all in my head, so I'll just go away. Overall, I really like my Trailblazer, but I feel this problem is a real safety hazard. HELP......
  • macman246macman246 Posts: 118
    You are probably experiencing the "jet engine roar" and lack of power frequently discussed here. This typically goes away after 2-4 minutes of driving, and is considered "normal". If it doesn't go away after 2-4 minutes, it is fixed by replacing the fan clutch, fan switch, or reprogramming.

    Make sure your repair orders document your specific concern VERY CONCISELY. It will help your lemon law case immensely if you can show the dealer has been unable to fix the exact same problem every time.

    My '02 Envoy was great the first year, lots of power and a nice ride. Then it started to have a stalling problem, tried to get it fixed 6 times, and now GM is in the process of refunding my money.
  • tblazedtblazed Posts: 945
    "where on the internet I could find all the computer upgrades"

    Go to the web site below and enter in your VIN. You won't be able to tell what you have exactly but if yours has not had any updates done since manufactured, there are some worthwhile. I ran my VIN a couple of months after I bought my 11-01 built TB in 1-02, and printed out the data. Then about 2 months ago I ran the VIN again and found several updates that had been done to improve cold performance and shift, 1-2 shift, fan control, etc. I can say that after having mine done there are more tweaks than just those. Other things have improved as well like quicker overall trans shifting, up-or-down shifting, shifts back to 1st doing a rolling stop much quicker now is ready to go in 1st rather than being in-between gears, better low-end torque, snappier throttle response, runs a HECK of a lot better when cold. And gas mileage has gone up. Can't beat that!
  • m2icemanm2iceman Posts: 27
    I decided to change my own oil on the TB and noticed something that I have to ask a question about. When I took off the cover and saw the oil filter, I saw two plugs. One had oil on it, so I figured that was the one to drain. As it was draining, I noticed that only about 1 1/2 quarts came out. Knowing that the TB takes 7 quarts I know I didnt get it all. I noticed the plug that faces down and opened it up and drained the rest of the oil.

    I just want to make sure I didnt drain anything other than oil. They both looked like oil, but did I drain something I should not have with the plug that I facing left if your looking at it from underneath? It kinda seemed weird that there would be two plugs, but having 7 quarts may be the answer. Anyone else that has changed theirs, let me know. Im making sure before I decide to drive it, if I had drained something that I have to replace other than oil.\

  • scottc454scottc454 Posts: 356
    Real simple - just reopen the first plug - the wrong one. If another 1.5 quarts comes out, you're fine.

    If not, you must have drained transfer case fluid.
  • m2icemanm2iceman Posts: 27
    Ok, the oil that wasdrain wrong, was the transfer case. Now the only question I have is, where do I put it back in. I can see a line that goes to the top of the engine block, and a larger bolt on the top of the case. Just need to know where it goes so I can complete this and not have to worry.
  • twinrottstwinrotts Posts: 161
    Changing out the stock exhaust to dual is supposed to be good for 30 ponies.
    Anyone on this board have that done??
    Was wondering who is making the equipment, what it cost and if you can really feel the extra power.
    Anyone know what it does for torque??
  • gam2gam2 Posts: 316
    30 h.p.? What a hoot! Most aftermarket systems might give 5-10 h.p. at most, and that's at high rpm's. It's only duals after the rear axle. Get it for the looks, not the performance.

    I have an article on tweaks to a Z-28. They added an K&N air filter, underdrive pulleys, and a Borla exhaust. They gained 10 h.p. as measured on a dyno. If the manufacturers could find 30 h.p. by changing the exhaust, they would.

  • aldan93aldan93 Posts: 202
    Are you sure you have a TRIP? not a TRACK?, The best I could do is 22MPG, I guess if the wind was right, and I lost 50 pounds, with the windows rolled up, may just maybe. Can I ask If you drive on NEW YORK 90, do you stop in Veronia NY to get gas? I drive from Buffalo to Veronia, I thought that was an accomplishment in my FORD EXPLORER, b4 heading up to the ADAKS.. My TB at 28 mpg, maybe I can make to OLD FORGE!!!! HE HE.
  • momstruck1momstruck1 Posts: 206
    I have had this noise for a little over a month now and it makes me nuts . It is in the front end and only happens at low speeds over bumps. Now it seems that the bumping noise is somehow traveling up the steering wheel. I feel a slight shake to the steering wheel after I hit a bump while the noise happens . I am thinking that maybe it has to do with the steering or tire rod or maybe an axle? It is not the hoses as the chevy tech first thought that they were miss-alined and then they thought it was the shocks but they changed those to no avail. So now i must wait till my dealership opens in about 2 weeks to have it fixed because the other dealer I was going to refuses to look at it he thinks I am nuts and supposedly doesn't hear it but two people who drove my truck last week both felt it and heard it . What does everyone think ??
  • baleaverbaleaver Posts: 2
    A big thanks to tjcishere1 for message #10856 detailing the location of the frayed ignition wire. Mine was in the same location but failed at 44k miles - the purple wire appears to rub slightly on the bracket whenever the brake pedal is pressed. My guess is that this problem is going to be seen by many people - yours was an Envoy, mine is a Trailblazer.
    Chevy dealer (service guy)in Golden, CO would not say if they were aware of the problem or not but would fix for $50.00 - I felt like I had just been breathed on by a Snake Oil Salesman (and this is a dealer I have bought 6 vehicles from in the last 15 years).
  • ficussficuss Posts: 541
    Prior to buying this 2002 TB, I had a 2001 TB. The truck had 3 incidences of frayed wires. This left such a doubt in my mind that I sold it after 6 months of owning it. The first time a wire frayed it left me stranded, I couldn't shift out of park,. It had to be towed in. The second time, the air wouldn't work, a frayed wire in the engine compartment shorted the power to the compressor clutch. The third time the entire turnsignal control stopped working due to a frayed wire. I guess the general hasn't learned much.

  • I just installed the Borla cat back set up on my 02 Envoy. I can't honestly say if I gained any HP but I've only driven a few miles of in town driving so far and haven't really noticed much of a difference. Borla claims 15HP/20ftlbs of torque,that's only 5% more than the 275 stock HP so you're not likely to feel it too much. The dual polished tips sticking out from under the bumper do look really cool! The sound is VERY mellow, not like what you would hear on a V8 with a performance adds just a hint of rumble in the cab under load, If you're looking for hot rod loud, this is not the system for you. $800 bucks for this is not cheap but it is a very well made set-up with lifetime warranty. Custom muffler shops in town quoted me $475-$550 for regular steel that would rot out in 2-3 years here in WNY. I am expecting a Jet Stage 1 module today which promises 24HP/28 torque plus firmed up shifts.....this is the part I expect to deliver some "seat of the pants" improvement to the performance.
  • 4jwv4jwv Posts: 6
    I had a JBA "EVOL" cat-back exhaust installed on my Trailblazer, last December. This exhaust did produce more upper RPM Power, less low end torque, and a very annoying low bass, droning noise, at about 1900 to 2800 rpm. Also gutted the airbox and installed a K&N airfilter. After about three weeks, I couldn't take the noise anymore. I called JBA and did some research which led me, to have the original tailpipe and small muffler reinstalled. I kept the front half of the JBA system, (bigger diameter pipe and straight-thru main muffler). Now the noise is gone, low end torque is back, midrange power is better than stock, and it has a nice muted growl!
    I also tried a Volant Cool Air Intake, this replaced the entire stock airbox and both resonators, and hooked-up right to the throttle body. The Volant seemed to flow well, but was very loud, whenever the throttle was opened, even a little. I sent it back, and reinstalled the gutted "stock" airbox and both resonators.
    If I was to start over, I would go with a Borla Exhaust and an Airmax Cold Air Intake.
    The best improvement I have made to my Trailblazer is changing to 18" AT Italia wheels and Pirelli Scorpion Zero Tires (same tires the new Porsche SUV uses). Now the ride is firmer, I have less lean in corners and it sticks to the road like glue!
  • Has anyone heard of this problem yet ... I have a 2003 Envoy XL. After 2 weeks, the Service 4wd light came on. THey replaced the switch for the 4wd in the truck and it still came on. They opened up a TAC case with GMC and I was told that it's a software issue and they are working on it. There is no ETA for a resolution. In the meantime, my 4wd system is flaky. Sometimes the switch has lights, sometimes two lights, sometimes no lights and sometimes lights on A4wd when it's set for 2wd. This has been going on since January 15th. I called GMC and they just say too bad, there's no resolution yet.

    Since then as well, the ignition switch went, which caused the tranny to stop working. And last MOnday, the tranny went again and now they are replacing the Transfer motor and Transfer case. I've already downloaded the lemon law papers for NY.

    OTher then that, my wife and I love the truck. It's rides nice, I like the interior and how it's laid out. A little too much wind noise, but I can deal with it. Not much more then my 96 pathfinder. Sometimes I wish I splurged and got the Acure MDX.
  • You stated you have 18 inch tires. What kind of 18 inch wheels do you have and how wide are they? If one would get new wheels that were any wider than the 7 inches, would they stick out further than the body? I'm looking for some 17X8 NON-crome 4X4 wheels but they are impossible to find with this bolt pattern. I do occasionally take this off road but hate the look of my 16X7 factory wheels. I like the 17X8's on the top end Durangos.
  • tblazedtblazed Posts: 945
    A "2001" TrailBlazer? Never knew they sold the current gen 360 chassis as an '01. You must have had one of those pseudo-TrailBlazers based on an S-10 Blazer??
  • tblazedtblazed Posts: 945
    Just went out and looked for any purple wire that might be rubbing against anything metal when the brake is applied, did not see anything close. Only the part of the harness that goes to the brake switch on the arm itself. I can see how that might possibly get up against a metal edge if it weren't positioned right. Trying to visualize exactly what wire is getting damaged from the brake pedal movement and do a little preventive maintenance.

    While under the dash looking around for potentially abraided wires, I did notice the way the gas pedal and its sending unit are mounted to a 90° bracket and it does seem to have a sideways resonant vibration to it when tapped or bumped. On occasion I do feel the pedal vibrate under certain engine RPM and loads but it doesn't bother me - very minor. But it looks like to me anyway it wouldn't be all that difficult for the engineers to come up with a second brace to kill that vibration people complain about.
  • 4jwv4jwv Posts: 6
    I have 18"x8.5" AT Italia Presa wheels and 255/55VR-18 Pirelli Scorpion Zero Tires (they are very close to the stock tires outside diameter, so the speedometer is correct). The offset of the wheels is perfect, they do not stick out beyond the body, but close to it. I got the whole package from: they were great to deal with! I would highly recommend this tire and wheel package!
  • He writes
    I ask If you drive on NEW YORK 90, do you stop in Veronia NY to get gas?

    Nope, I don't buy gas from Indians. They sell without collecting sales tax or paying property tax which puts all the other busineses which has to out of business. Our spineless governor wont make them collect it like the supreme court said they had to.

    I go Buffalo to Rochester and Rochester to Syracuse. I fill up right before I get on and the second I get off. I really am getting 26 to 28 MPG. Good luck to you and wave if you see a dark blue Envoy going by on the back of a flat bed, hey thats how I get the great mileage. Just kidding :)
  • ficussficuss Posts: 541
    There were Trailblazers in 2001. They were the same as the the other Blazers but had a "Trailblazer" insignia stitched onto the top front area of the front seats, as well as other small add ons. I forget what the rest of the package included, tires, wheels etc. but it was called a Trailblazer. Something like Ford's Eddie Bauer Edition. By the way, when the first wire shorted, it blew the fuse needed to power the park release solenoid. That is why it needed to be towed in. They found the wire pinched in between two sharp pieces of metal. On Star came in handy during the 6 month ownership of that POS. Looking back to that car, it also had the roaring cooling fan. It only activated a few times, when the engine was heating up. But it did make a loud roaring sound and it felt like it was robbing a lot of power.
     The 02 TB is far more advanced technically than the 01 TB, but unfortunately it still has some basic design problems as well as some far more advanced design problems. I guess we'll soon have third generation design problems to deal with. Oh well. It will keep this forum going.

  • jr45jr45 Posts: 45
    My two-week old '03 Bravada has all of 900 mis. on it now, and it has begun to shudder when turning hard - whether you're going forward or backing up. It's as if the 4 wheel drive is locked in or the rear diff is locked. Anyone had this problem?
  • He writes:
    They found the wire pinched in between two sharp pieces of metal. On Star came in handy during the 6 month ownership of that POS.

    I had a 2000 Blazer, a LS I believe was the designation. POS instead would have been much better "truth in advertising" frankly.
  • tidestertidester Posts: 10,059
    I am sure you meant Pesky OnStar rather than something that might offend some readers. :-)

    tidester, host
  • badgerpaulbadgerpaul Posts: 219
    I had a 99 Blazer LT and in the 45,000 miles I owned it, it had only one warranty repair and that was for the digital outside temperature gauge. In the six months I've had my 03 TB LT it's been equally trouble free. So not all of them are bad.
Sign In or Register to comment.