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Chevy Silverado and GMC Sierra Duramax Diesel Questions

220 messages,  Last post on Dec 04, 2009 at 4:59 PM

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What is this discussion about? Chevrolet Silverado 2500, GMC Sierra 2500, Chevrolet Silverado 3500, GMC Sierra 3500, Engine, Diesel, Truck

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#164 of 220 Re: Recommended truck [magras60] by dieselrookie3 May 25, 2009 (10:00 pm)
Replying to: magras60 (May 25, 2009 3:07 pm) I dont know much on the used diesel trucks but good maintenance is a must. Our current truck is a 2008 duramax 6.6 litre diesel 2500. We tow a 25.5ft trailer(dry weight 5500 lbs.) with no problem. We use approx. 15.5litres of fuel/ 100kms(Canadian). I have talked with a lot of my diesel friends and all have been very happy with their duramax diesel powered trucks. I suggest purchasing the newest as possible(budget allowing of course) GMC or Chevy Duramax diesel with the Alison transmission. Other friends have been happy with their Dodge cummins diesel motor with the allison transmission. Both are very highly rated. I dont support chips or alterations to the truck unless it has been proven to be a asset(mainly because I dont need it with my new 6.6 litre). The new 6.6 doesnt even require a lubricant to the fuel as it has high pressure fuel injectors, apparently. I suggest taking a GMC shop foreman out for lunch and quiz him on the pros and cons of different year trucks. I hope I have assisted you in some way.
#165 of 220 Can anyone help me out by evansdad Jun 07, 2009 (4:21 am)
I have just gotten a 2004 gmc 2500hd duramax. When I take off I hear a thumpin noise like thump..... thump......thump........ but at higher speeds I cant hear it what could it be and also when I turn left I can hear a squeaking noise only to the left please help Replies to this message: evansdad (Jun 07, 2009 4:24 am) folb (Jun 07, 2009 1:51 pm) evansdad (Jun 11, 2009 4:56 am)
#166 of 220 Re: Can anyone help me out [evansdad] by evansdad Jun 07, 2009 (4:24 am)
Replying to: evansdad (Jun 07, 2009 4:21 am) I forgot to say the thumping noise seems to be in the front right tire and also the squeaking noise in the right front tire as well Replies to this message: folb (Jun 07, 2009 1:51 pm) evansdad (Jun 11, 2009 4:56 am)
#167 of 220 Re: Can anyone help me out [evansdad] by folb Jun 07, 2009 (1:51 pm)
Replying to: evansdad (Jun 07, 2009 4:24 am) Check the front hubs. Had mine replaced. 2005 Duramax. Mine felt like it would drift and had a thumping sound. Replies to this message: evansdad (Jun 11, 2009 4:56 am)
#168 of 220 Water Pump Change Out by toomanymiles3 Jun 09, 2009 (5:49 pm)
My 2005 Duramax 3/4 ton 4/WD just turned over 179,000 miles . My water pump is leaking and I started to change it out but there is one Bolt behind the Harm. Balancer. Of course the water pump is driven off the timing gear and to the right below the power steering pump but one bolt is behind the Harm. Balancer. Does anyone know if the center bolt holding the Harm. Bal. on is right or left hand thread. I installed a Bullydog on the fly programmer at about 65,000 miles and instantly saw a increase from 19 MPG to 22MPG in town. With no head wind I now can drive at 72 or 73 to get my best mileage. I now can get 24 to 26 MPG on cruise on long trips. I have got the front fan off and will work on the Harm Bal. Tomorrow. Hope someone knows about the center bolt and what tool to take it off. I have more time than money. Thanks
#169 of 220 You was right by evansdad Jun 11, 2009 (4:56 am)
Replying to: folb (Jun 07, 2009 1:51 pm) Hey thanks alot that was the problem i sure do appreciat the help The new hub assembly was 379.00$ and the labor was 72.00$ Good deal im back up and running and i cant beleive the power this thing has why would anyone need a chip i dont understand
#170 of 220 Duramax Limp mode problem by beast5 Jun 12, 2009 (6:47 pm)
Hello I have read some postings about some problems with duramax going into Limp mode. The truck I have is a 2001 2500 4X4 runs great until I put a load on it. It may go 30 miles and it may not go but 10 before it acts up. I can pull off and it will reset in about 5 min. The dealer I use has changed injectors ,fuel pressure sensor , fuel rail, fuel pressure relief value and something they called a dump value. I just got it back today and it is NOT fixed. The dealer said they started a case on it and they are at a dead end. Anybody got any ideas. Replies to this message: folb (Jun 13, 2009 2:03 pm)
#171 of 220 Re: Duramax Limp mode problem [beast5] by folb Jun 13, 2009 (2:03 pm)
Replying to: beast5 (Jun 12, 2009 6:47 pm) Give me more info. Have you put a power enhancer on, chip, etc? Does it give you a check engine light? Is it mainly when you're going say over 50 and you try to accelerate quickly from there and it downshifts and then the engine light comes on? Did they replace the fuel pressure valve on the back of the fuel rail on the driver side? I got a shim kit for that and then just ordered a new valve from PPE out of California. I got their programmer and it gives my engine so much torque on level 4 out of ten that it causes the tranny to go into limp mode. You may have a pressure problem. Bully Dog sells a pressure kit for a 100 or so for the tranny. I need to get that too. You don't have to drop the trans. Let me know how it goes. Any DTC's??? Jeff
#172 of 220 oil pressure by evansdad Jun 14, 2009 (3:26 am)
I need to know what is good oil pressure when you come to a stop mine runs around 60 to 70 while driving but when i stop it goes to 30 or below just had the oil changed im kinda worried thanks its a 2004 duramax
#173 of 220 duramax problems by jegriswold Jul 28, 2009 (9:49 pm)
This is my 2nd Duramax. Never experenced problem until now.   Start of problem: - picked up water during long distance trip. Water in fuel indicator came on many miles down road. Engine quit. Was able to bleed filter to continue. Added heat for three tanks. Changed fuel filter three times. Light finally went out. -Started experience problems since then. If I try and start engine before glow plug light goes out, engine will not start and will not start for sometimes hours. Now after driving on longer drives, engine will not restart if engine is shut off. Will also die sometimes going up hills and will not restart until setting for awhile. Engine guages show no overheating. Runs great on the road. Idles very rough. Notice that fuel hand pump has no pressure. Repumping does not help restart. Starting fluid (eather) will not work. Only setting for sometimes hours works. -Does not use excess fuel. Does not use oil or smoke. Oil pressure shows low oil pressure but is not low on oil. Use to show about 60% guage but now almost red. Anyone have suggestions without replacing everything on engine?   Stranded Replies to this message: dieselrookie3 (Jul 28, 2009 10:24 pm)

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