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Also, I have found with my CRD that the acceleration portion of any trip uses a lot of fuel, which also really brings down the mpg average. After following the great advice in this forum, your best mileage will always be at constant speed on flat or downward sloping ground.
Last week I got an aggregate 25.5 mpg on a 500-mile loop across Texas, mostly highway speeds of 65-70 mph (calculated by hand). My best yet in 4,800 miles!
I ordered a Magnaflow muffler and once installed I'll report on any impact to my mileage.
It took three trips and my check-engine light was rectified. The EGR and Mass Air Flow were replaced to the tune of $550 billed to DCX.
Has anyone who has run ULSD from their FIRST FILL-UP had to replace their EGR?
--Boiler
Since I have not been at home, I did not actually read the recall but by wife said it was a body module.
Anyway. She took it to my ***** and when she got there they told her that they could not perform the recall because they didn't have to tools. If she left it they would have to keep it for a week.
They don't have the tools? Keep it for a week? What are they going to do to my jeep? Does anyone know what this recall is about or have you gotten the same run around. I was wondering if they were just feeding her a lot of crap to get her to go away because they were busy over the holiday weekend.
By taking the last 8 characters of your VIN, you can see what the recall is at:
link http://www.jeep.com/owners/index.html
Click on "recall notices"
--Boiler
odometer/gallons/date/trip distance/mpg this tank
5952 17.462 06/26/06 459 26.3
6290 12.872 06/27/06 338 26.3
6642 14.829 06/27/06 352 23.7
7041 13.8866 06/28/06 399 28.7
7236 8.173 06/29/06 195 23.9
7607 13.847 06/30/06 371 26.8
7988 13.87 07/01/06 381 27.5
8261 10.818 07/01/06 273 25.2
8658 16.1186 07/02/06 397 24.6
8912 8.285 07/03/06 254 30.7
I will need to fill-up today and see if the 30.7 was a fluke or not (which would be indicated if I only get, say, 20mpg on this tank). As you can see, the mpg was pretty good, though most tanks were only right around the EPA rated 26mpg highway.
1) On I-70 in the Colorado mountains, coming back from Grand Junction (desert - 5000ft elevation) to Breckenridge (alpine valley - 9000+ft elev) we were going down a long incline around 11pm, with an air temp around 40 degrees, maybe less. After we exited the freeway into Frisco, we found almost no power from the engine. We could barely go 30mph up a hill that we had gone up at 50mph no problems the day before. This lasted all the way until we parked at the hotel. The problem disappeared the next morning when we left. However, I also added a fuel additive and more diesel shortly after we started that day. My theories are:
A) Fuel gelling. I'm sure I had summer diesel #2 in the tank since the last two fill-ups had been at warm, low altitude areas. The 40 degrees should not have been low enough for gelling, but I understand our CRD has a throttle body as part of the emissions controls, and maybe the lower pressure over that throttle reduced temperature in the intake below freezing and caused straight #2 diesel to reach its gelling temperature.
EGR valve failure. Symptoms don't match EGR failure and problem went away.
C) Turbo hose loose. Since problem went away, this is unlikely. I also checked all turbo hoses and all were tight.
Any other ideas???
2) At numerous times during the trip, but especially in the mountains, there was an exremely harsh upshift around 35mph (I think this is 3rd to 4th gear) which was jarring and not normal for the vehicle. Ideas?
3) Quite a number of times, but mostly in the last few days (low altitude, more humid air, mild temps, only two tanks of fuel) I had the infamous shuddering problem. Almost all of these were when I backed off the throttle after hard acceleration - either to pass another vehicle on a two-lane or to accelerate up a hill. It was quite severe and was not easy to get rid of - I had to add some throttle and back off multiple times to get it to go away. Fuel quality could be a factor as I used stations that I'm not familiar with (no choice being on a trip), but mpg seemed pretty good and there were no other fuel problem indicators. Ideas?
Overall the CRD performed quite well, returning 25+mpg on average, but all three of these problems together have me concerned.
On a sidenote, apart from the #1 problem, the CRD did very well in the mountains, even at over 10,000 feet. The turbo lag is far greater at 9000+feet, but full power is still there after the lag time. Brakes worked fine and engine braking was significant and useful on steep descents. Once reliability is there, the CRD would be a great choice for someone living high up in the mountains.
25-29 mpg etc. I usually keep my vehicles 8-15 years and are concerned after warrenty. Does anyone know of a reasonable priced interface with the ECM, TCM? A few years from now dealers may try to recoup their training costs by
charging more for service. Without a second source to query
our controllers, the dealer has a monopoly.
I have a diesel van which is generating back pressure through the coolant system, could this be the problem?
thankyou in anticipation. :sick:
Good luck, I left mine for the morning only because I didn't have the time for them to pull in and reflash the computer. Leaving it for a week seems pretty screwy
I've experienced this as well on mountain roads. I think the transmission shifts immediately from 3rd to 4th gear because the egr is closed (engine is under load), so there is no delay, and the revs are high enough (above 1700) for the controller to skip the sequence that leaves the converter open. I usually leave the O/D out of the way in this case. You have to reduce or increase your speed in such a case. Always keep in mind the torque arrives rapidly in the low rpm and we don't have a tranny designed for mountain conditions. I would have preffered a shorter 3rd gear and and longer 4th. The same applies while driving at 35 mph (city speed limit here). I expect the 6 gear manual to be more adequate for this speed.
Farout
Dr.Z has not answered my question yet.
I wonder why? I now have 16,200 miles. I find myself wondering how much longer before some typical thing goes out, you know EGR or Trans or ...... whatever. Maybe I got a good one that was made on a Tues. morning when everyone was happy on June 14, 2005 of last year. I wonder what day the 14th was in 05?
Just for the heck of it can most of you burn rubber when you punch it to the floor? I can with no effort at all. But because I buy my own tires I don't do that too much. Just when a gas Liberty is next to me, and I feel I want to make him think he has a lemon of a gas Liberty.
Buy the way when are we to get this super ULSD?
Farout
Are you not happy us "test market" high sulfer, low cetane owners have proven these CRD's will endure this USA diesel, so you in France won't have to go into all this EGR replacement? Is your Trans a 5 or 4 speed Automatic?
At least your soccer team did a lot better than ours did......ouch!
Farout
My CRD is happier on B20 than anything else, but the two stations from which I buy B20 seem to be blending it with quality, clean, fresh petrodiesel. My CRD seems quite fuel sensitive and when I'm not using B20, it runs much better on two brands of premium diesel (BPAmoco and Meijer; Meijer is a midwest grocery store chain) than on any other brands or "regular" diesel.
I can just barely squeak the tires if I floor it from a stop. It accelerates very well, and I hardly ever floor it from a stop - maybe once a month at most. I will say that if you've never floored it, you probably think the CRD is much more sluggish than it is. The more I drive back to back with my Ram/Cummins the more I notice the non-linear and slow throttle response for the CRD when it is driven sedately. The Ram/Cummins is smooth and extremely linear, but never very fast.
When we first drove ours in Feb. '05, pressing the accelrator did nothing and then full turbo kick in and afterburner acceleration. Those does are gone now with all the tsb's.
Today, put a whole bottle of redline catalyst in the fuel and repeated our recent drive but only with the evic. Fuel additive, tranny adapting, whatever. Reset evic and with evic readout only, drove out on the highway cruise at 65 mph but overdrive off, 2850 rpms and evic bounced between 23.7 and 24.5 mpg. Reset evic for return trip with O/D on 65 mph cruise on. Evic steadily climbed and bounced between 27.9 and 28.3. Now I am totally confused.
The non-linear, I think was explained by caribou1 early last year as the potentiometer for an accelerator pedal. When bought and until the first tsb, we could depress the accelerator watch the green light and wait for the response which was the afterburner kicking in effect.
Oh, to top it off, the Cummins for 2006 does not have an EGR valve (looks like it will for 2007, sigh) nor glowplugs* and is fairly insensitive to fuel quality, unlike the CRD. (* in case you're wondering, it has manifold heaters instead of glowplugs)
When I change the oil from 0w-40 to 5w-40 the engine was running a lot quieter than with 0w-40, maybe because the oil was thicker.
The other day I bought a CM filter 25-462 well known in the speed world; they have very high oil flow and filter down to 8 micron.
My CRD run with it very well but is noisy as it was with the 0w-40 but my mileage went up 3 mph.( from 25 to 28 and counting). I think the oil flow is so great that the engine run smoother that before but one thing for sure is that I have a better oil flow and the engine will last me longer without problem.
I now use Shell Rotella 5W-40. My dealership provided Yacco 5W-40 and I saw no difference between the two brands. There is still something I can't explain about mileage variations: I get the best mileage when buying fuel from shopping mall filling stations :confuse: and I just don't know what I'm buying :sick:
Concerning egr problems, I'm out of the game... This morning I was following a MB ML270CDI that produced lots of black smoke when accelerating from customs lines getting on the motorway, so I floored mine to stay away from his puff and I sent quite a lot of light brown smog for a few seconds. All this to say that I doubt LSD or ULSD will solve the egr problem. He had a new one, I have none
My transmission is a flawless 5 speed automatic, 462RLE if I remember correctly. I read somewhere it's what you should be getting soon.
By the way, my truck was assembled in April 2003. I'm close to 50,000 miles with ZERO defect apart from the mechanical fan clutch that had too much play from the beginning and the egr valve I put aside...
This is the best vehicle I owned in 38 years :shades:
I have run only Mobil One 0W-40, only because I can't find the 5W-40. Odometer reads close to 5,500. Have changed the oil twice, keeping up with the extreme driving conditions as mentioned in the book. (I use my Jeep on the beach quite often,sandy/dusty conditions, many short trips, stop and go driving, every 3,100 miles)
Fuel additives: Lucas fuel treatment at every fill up. On some recent long trips I have gotten a best of 29mpg while most are in the high 26 range. I do not use cruise control or putz along at 65. I am usually heavy on the gas, in the left lane at 75-80 hoping that Mr. State Trooper doesn't jump out of no where.
If you haven't tried the Lucas fuel treatment I highly recommend it. I have tried the Cetane Boosters from other companies and they have done little to boost the mpg. A Big bottle will set you back about $8 and last for quite some time. Those are my 2cents.
As far as problems, the trans shifts like a paddle in a septic tank and I had it into the dealer for a recall on the 06 Model for the Module Reflash. The dealer I took it to didn't know anything about the infamous "trans shudder" and said I would need to leave the Jeep there for an extended period so they may diagnose the problem. I said "I can take you out of the parking lot and show you" but they don't like customer input. I'll just wait for it to grenade itself and get the whole thing rebuilt. I figure then they can truly diagnose the problem. Happy Motoring :shades:
It seems the crd is cleaner than the MB with your smoke report. Since your turbo hose sweats, I assume you have oil in your cac and intake. But with a bigger intake than a vw, you may never have a problem.
The turbo hose picture shows the crap on the replacement hose and the missing rubber sleeve broke while the new bottom part of the airbox was replaced.
If you read my posts, when travelling we keep up with the herd. And while the arrows tell me where the action is, I try not to be the point man - short life.
Gas can be additive blended per individual request before a tanker leaves the tank farm. Diesel is not. Everyone gets the closest refinery's output. The only difference is if it was adulterated (which apparently is allowed) or not. Maybe our new standards for sulfur and labels at the pump will get us all good unadulterated diesel. Someone posted about a cetane test of fuels near a big mid-west dealer. Mixed together the cetane rating was 38? - well below the presumed 40-42? everyone talks about. And well below the 49 cetane some have access to.
Have you tried doing a fast take-off when the permanent mode 4WD is engaged? You won't burn rubber, but in two second you'll be way, way ahead of those who spin their tires :shades:
An oily/sooty deposit could build-up on the intake pressure and temperature sensor. I can imagine that being a source of error for the ECU leading to poor mileage.
Besides poor quality fuel not giving the expected angular acceleration to the engine and a slower (delayed) response from the 'coated' pressure and temperature sensor affecting the fuel-air mixture, I don't see what could go wrong. Remember we have no flywheel inertia anymore...
I've seen dirty air filters not affecting performance due to the nature of the trapped dirt. We seldom have the very fine dust that penetrates everywhere, like the red stuff you collect when driving through the Monument Valley. I usually have insects and leaves, sometimes bird feathers, once a mouse, but no flour textured dust. In my case I leave aside the idea of the airfilter affecting performance: I vacuum clean the folds, the airfilter housing and check for cracks looking towards a light source.
If there is a sensor in the intake port with the throttle valve, it is now clean from the simple green. I'm guessing that oil from the ccv (and turbo cooling oil? from dirty air filters from vacuuming the highway) is one cause of the egr failure codes thrown. The oil and goo and tar might be too much for the solenoid to overcome to partially close the throttle to let more egr gasses in. Failure throws the code because egr gasses cannot be added to the fresh air intake. That's why the mileage goes up with a cel. Failure is a good thing in that it keeps egr gasses out. If it is running good and the cel is on and the egr is not an early one or has high miles, maybe it is better to leave things alone until inspection time. Of course, if it can't function as an anti-shudder valve then shut down could be not so smooth.
I am encouraged by how many miles you have on your. What do you expect your CRD to run till, like 200,000 miles?
Thanks again, it's always good to hear from your side of the pond.
Farout
If I punch mine it has a short lag and then it takes off like a rabbit. I have the wider 245 70 16 on and when I had the cheap factory tires it was even more so. I do floor it from time to time, I have never seen brown or black smoke, a misty light gray when starting it in the winter.
Farout
farout
With ULSD, will come s few things that will greatly aid engine and EGR valve life. The lower the sulfur, the better. Less sulfur, less PM, less corrosive emissions like the precursors of sulfuric acid. Also coming with USLD will be higher cetane. Higher cetane means a faster and cleaner burn. In the process of making USLD, certain aromatic compounds are removed, that when burned reduce cetane, increase PM.
If you put this all together, it adds up to longer EGR life and longer engine life.
If you read what the owners manual states, it uses the word recommended when it talks about oil. If there is a problem with the engine, and you are using a different viscosity range other than what DCX recommends, then the onus is on DCX to prove that the oil caused the failure.
Again, I suggest you look at the specs for Mobil 1, Shell, and Amsoil, 5W-40's and 15W-40 respectively. You will find that they are so close, that the engine probably does not know the difference.
As to the CRD engine being considered a small diesel, okay, I will give you that, but there are some big diesel concepts in this engine so it will stand up and give you good service so long as you give it reasonable care.
Let me include some specs here.
Amsoil 15W-40 90.8, 14.4, 164
Rotella 5W-40 90, 15, 176
Mobil 1 5W-40 102, 14.8, 151
First two columns are ASTM-445 at 40 and 100 celsius. Third column is ASTM-2270. Note how similar they are.
The fuel mileage would be great for me coming up from a truck that runs 13- 15mpg in my driving conditions. I would love a cummins Dodge, but the price is just outa reach and i think the fuel useage for my driving wouldnt be much better than where I am now. I really need to make a decision soon to get the good pricing. I see a few CRDS down near Detroit available yet. CAnt find anything up near Lansing- GR area.
Thanks for any input-
Bob in Mich.
In Missouri CRDs are getting fewer and the choice is becoming limited. The 05's have a 7 year 70,000 mile power train warranty the 06 has 3 years or 36,000 mile warranty. I chose a 05 last Sept. 29. Hope this answers your questions, and good luck.
Farout
40* C-----97
100* C---14.5
VI----------155
Can you confirm what I heard (but did not see) - LBJ replacements come in boxes labeled MOOG.
At this point, I would be very happy at 19mpg and anything after that would reassure me that I did the right thing. I just put another $50 bill in the quad cab gas tank tonight- its depressing.
I would say the ball joints not having a zert in them could be a big issue. We have a 2001 Hyundai, and the 2003 Dodge truck and both have what the steering industry calls" grease for life"-- no zerts. We build class 5 and up steering sockets and tierod assemblies at work - there are some big trucks out there that are of that technology now. I think its bad- those pcs need fresh grease. If I buy a CRD I will drill the caps and put zerts in just for piece of mind since I know they could be an issue. Was always gonna do it on my truck but never did. It would be cheap insurance.
Guess I'll go out and try a test drive and see how the CRD feels and go from there. I need to tow 3,000lbs about 4 times a summer- looks like they should be capable. I just need to make sure it has a tow package. I will also get the extended warranty- It has proved it pays with this truck I have.
Thanks, Bob