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Chevy Silverado and GMC Sierra Duramax Diesel Questions

359 messages,  Last post on Mar 02, 2013 at 8:38 AM

You are in the Chevrolet Silverado & GMC Sierra Forum.

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

Messages Page 36 of 36

#349 of 359 Re: Gas Mileage [mercstorm] by 04duallygal

Apr 24, 2012 (9:57 am)

Replying to: mercstorm (Nov 05, 2010 2:28 pm)
i have an 04 3500 crew dually 4x4, 6.6L Duramax 180,000miles, all stock except the aluminum wheels. I am getting 23mpg open highway and 16mpg in town heavy traffic. My best fuel mileage open highway is 71ish mph... if I run 55-65 the mpg drops off. I typically drive 500+ miles per week for work so this one NEVER sits around idle, that might be the secret?

#350 of 359 2004 Duramax No Start by weephee

Sep 06, 2012 (6:05 pm)

Hello I am new to this forum and in need of help. I purchased a late model 2004 Silverado LLY diesel extend a cab 2500 HD truck that will not start. So far I replaced the fuel injection pump which is a job I hope I never have to do again. I replaced all the glow plugs and one injector. Also replaced the fuel filter. Truck has 230 k miles. It has been at a GM Chev dealership for 2 days and the mechanics have been unable to start it. (Fires a little when cranking) They have checked compression and all is good and the fuel pressure is at approx 5200 lbs when cranking. GM mechanic is telling me there are no trouble codes. He thinks it might be the Fuel Pump Injector Module ($2000) item but no guarantees. They are going to call GM Technical Department for some help. Can anyone give me some advice as to what might be preventing this engine from starting. Anything I can tell the mechanic to look into. Thanks

#351 of 359 Re: 2004 Duramax No Start [weephee] by dozerdogg

Sep 11, 2012 (4:20 pm)

Replying to: weephee (Sep 06, 2012 6:05 pm)
Weephee when u changed the fuel filter did u fill it with diesel and prime it? I know when I changed the fuel filter on my 03 DMax I have to prime it and crank it for 15 min. Before it would start back up. Open up the bleeder screw on top of the filter housing and push the primer. Fuel should squirt out with not bubbles. Hope this helps.

#352 of 359 Re: 2004 Duramax No Start [dozerdogg] by weephee

Sep 15, 2012 (8:36 am)

Replying to: dozerdogg (Sep 11, 2012 4:20 pm)
Thx dozerdogg for your reply. I did all you suggested and it still wouldn't start. After 4 days of consulation between the mechanic and GM tech support, they are 95% sure it is the FICM. Dealer wants $2000 for it and I found a new one on ebay for $450. Dropped it off at the dealer today so perhaps on Monday the truck will be running. I will report back soon. Thx again

#353 of 359 Re: 2004 Duramax No Start [weephee] by weephee

Sep 17, 2012 (4:21 pm)

Replying to: weephee (Sep 15, 2012 8:36 am)
I came back from the dealer today and the engine will still not start with the new FICM. GM techs and dealer mechanic and the shop forum can not figure it out. Any ideas out there what can be tried next. Please help.

#354 of 359 Re: 2004 Duramax No Start [weephee] by gmcustsvcsarah

Sep 18, 2012 (11:05 am)

Replying to: weephee (Sep 17, 2012 4:21 pm)
weephee,
 
We're sorry to hear that your dealership has not been able to get this resolved; if you would like for us to follow up on this with them, please email the following information to us at socialmediagm.com: your name and Edmunds username, phone and address, the last 8 of your VIN and current mileage, and the name of your current dealership.
 
Sarah, GM Customer Service

#355 of 359 Re: 2004 Duramax No Start [gmcustsvcsarah] by weephee

Sep 20, 2012 (6:51 pm)

Replying to: gmcustsvcsarah (Sep 18, 2012 11:05 am)
Still no solution after two weeks at GM Chev dealer. Can anyone tell me what the supply voltage is to the injectors. I believe supply voltage is from the FICM. Mechanic says it should be 48 volts but I can't find that anywhere in the shop manual. Is is 48 volts or 12 volts. THX.

#356 of 359 Re: 2004 Duramax No Start [weephee] by weephee

Sep 28, 2012 (6:59 pm)

Replying to: weephee (Sep 20, 2012 6:51 pm)
Truck has now been at the dealers for 3 weeks and still no start. Gave them another ECM which they programmed and it made no difference. BTw the voltage on the injectors is 48 volts. They also did a fuel by-pass on the two injector rails and the results were within GM tolerances so that isn't the problem. Now they want to remove a few injectors and have them tested to see if that might be the problem. When they did the by-pass test there were a lot of air bubbles entering the injectors. I think they might be coming from the fuel filter hand pump so I've ordered a gasket set to replace the 0-rings. Also replacing the water collector at the bottom of the fuel filter. Is anyone interested in what is happening here. If I don't hear from someone, I guess I will quit reporting.

#357 of 359 Re: 2004 Duramax No Start [weephee] by drjones1235

Oct 07, 2012 (8:46 am)

Replying to: weephee (Sep 28, 2012 6:59 pm)
i am currently going through same problam changed steering columb truck started ran fine put my steering wheel with computer buttons on steering wheel will not start again bin two months no truck if you solve this problem could you please let me know ill do the same thanks

#358 of 359 Re: 2004 Duramax No Start [drjones1235] by weephee

Oct 10, 2012 (4:17 am)

Replying to: drjones1235 (Oct 07, 2012 8:46 am)
Hi drjones1235. The only thing that we might have in common on these trucks is that my clockspring is broken so I get an airbag trouble code and the steering wheel buttons do not work. Are you getting any trouble codes. Is your truck at a gm dealer I will change the clock spring this weekend and see if that makes a difference although I can't see why. Let me know if you make any progress.

Messages Page 36 of 36

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