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Chevy Silverado and GMC Sierra Duramax Fuel Mileage

506 messages,  Last post on Nov 30, 2009 at 5:21 PM

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What is this discussion about? Chevrolet Silverado 2500HD, Chevrolet Silverado 3500, GMC Sierra 2500HD, GMC Sierra 3500, Diesel, Fuel Efficiency (MPG), Truck

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#460 of 506 Re: Duramax Injector Problems [kodiak12] by madbrit427 Apr 05, 2009 (2:18 pm)
Replying to: kodiak12 (Apr 05, 2009 10:39 am) As far as I am aware when the LLY engine with the redesigned heads was introduced was when the main injector problem was cured. That being said, my 2004 LLY engine has had 3 injectors replaced at around 50,000 miles. They blamed it on the injector pump as I also had a rough idle and hunting at slow speeds. Extended warrantys are good, I extended the factory one and will extend it again next year if the option is still available especially as my truck has only just over 52,000 miles on it.
#461 of 506 Re: considering chevy [madbrit427] by pistolace Apr 13, 2009 (5:12 pm)
Replying to: madbrit427 (Apr 04, 2009 12:52 am) ON YOUR DISPLAY WHERE IT SHOWS AVERAGE MPG PRESS THE CLEAR OR ARROW BUTTON AND IT WILL DISPLAY INSTANT MPG. I JUST LEARNED THIS MYSELF Replies to this message: vaughninms (Nov 28, 2009 5:22 am)
#462 of 506 low fuel rail pressure by jodie1614 Apr 26, 2009 (4:43 pm)
I have a 2003 Chevy Silverado 2500HD Duramax with cooking oil conversion that is throwing a low fuel rail pressure code. I push on the gas and it acts like it is out of gas and wont go over 1500 rpms. Replies to this message: madbrit427 (Apr 27, 2009 12:55 am) roland3 (May 07, 2009 7:34 am) unionman1 (Jun 13, 2009 11:34 am)
#463 of 506 Re: low fuel rail pressure [jodie1614] by madbrit427 Apr 27, 2009 (12:55 am)
Replying to: jodie1614 (Apr 26, 2009 4:43 pm) Probably clogged up the fuel system using that gunk. Monitored this used cooking oil fuel with a bunch of friends who ran bus conversions and many dumped the system because it was so labor intensive. Forget to swqtch over to regular fuel before shutting off the engine for the day just once and you had a bunch of cleaning out before you were on the road unless you were really lucky. Fuel has to be heated to keep it flowing properly, etc, what a pain. I could see using used cooking oil if you drove all day and night but for day to day, what a pain it can be.
#464 of 506 Smoke by smokin May 07, 2009 (4:47 am)
I have a 2006 Duramax milage is OK 16-18 mpg. BUT when I reslly get on the pedal the exaust pours out a HUGE cloud of black smoke. I am I running too rich or is this normal?? Replies to this message: madbrit427 (May 07, 2009 9:26 am) jbull454GMC (May 11, 2009 5:15 pm) wear04 (May 20, 2009 1:55 pm) jbull454GMC (May 20, 2009 5:40 pm)
#465 of 506 Re: low fuel rail pressure [jodie1614] by roland3 May 07, 2009 (7:34 am)
Replying to: jodie1614 (Apr 26, 2009 4:43 pm) ... Are you heating, starting and shutting down on regular Diesel fuel like m.britt says, and also changing filters more frequently. I don't think it would be that much problem for one POV.
#466 of 506 Re: Smoke [smokin] by madbrit427 May 07, 2009 (9:26 am)
Replying to: smokin (May 07, 2009 4:47 am) Take it back to your dealer, you did buy an extended warranty didn't you? Anyway, it should be covered under the 5 year 100K engine warranty. I had bad smoke and a really stinky exhaust. After two trips to the dealer, they had replaced 3 injectors, the fuel pump and goodness knows what else and it seems good now (touch wood!!!). But I still don't know what the problem was as they appeared to change parts until the problem was cured. They did say the faulty fuel pump pressure had damaged the injectors. Great truck, just love it, but it goes away when the warranty runs out...... LOL.
#467 of 506 Re: Smoke [smokin] by jbull454GMC May 11, 2009 (5:15 pm)
Replying to: smokin (May 07, 2009 4:47 am) On an 06 16 to 18 isn't bad with this new low sulfer fuel. although 19 to 20 is more normal. A puff of smoke like that I would have checked out. Duramaxs aren't known for snoke unless they have had a tuner put to them. Could lead to an injector or injection pump problem though so have it looked at.
#468 of 506 Re: Diesel truck advice for girls! [chani] by svetter May 16, 2009 (11:44 am)
Replying to: chani (Jan 16, 2005 8:34 am) I have driven chev all my life (45 years) but I think am going ford next time The duramx and the allison have been good but I've had lots of problems with other things. (Transfer case, door locks, u-joints, transmission lines,rear end vibration,) So I may try a ford. Besides they have not taken any tarp money. Replies to this message: jbull454GMC (May 16, 2009 7:18 pm) jerrydock (May 17, 2009 5:29 am) jbull454GMC (May 17, 2009 11:38 am)
#469 of 506 Re: Diesel truck advice for girls! [svetter] by jbull454GMC May 16, 2009 (7:18 pm)
Replying to: svetter (May 16, 2009 11:44 am) Working for a Chevy dealer I know about those problems. I will admit, they need to be addressed and dealt with. Along with window regulators, and a few other things. On the Ford subject though, you may want to ask people who have them about the fuel economy. I've talked to a few and they say its horrible. 11 unloaded and 8 with a trailer. Thats more like the old 454 gas engine. They say they pull and haul great just drink fuel. I'm not real thrilled with 15 to 18 on my 08 duramax, truthfully. Especially after talking to people with older ones getting 20 on average. How do you use more fuel and be safer on the enviroment? We can thank the government for that idea...Honestly I don't think there are too many differences anymore. I almost bought a Cummins before I got my Duramax and remember, I work for a GM dealer. Replies to this message: jerrydock (May 17, 2009 5:29 am) jbull454GMC (May 17, 2009 11:38 am)

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