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Old 06-06-2006, 09:54 PM   #15
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I had the same problem with my 4wd. Fixed under waranty and has not been a problem sence. I can get 22mpg on interstate doing about 63. The only thing I had done was a K&N cold air intake. On a crew cab Z71 short bed.
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Old 06-07-2006, 04:01 PM   #16
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For those who may not know , www.Dieseplace forum is all about Duramax/Allison . Like this forum , more reading than you have time for , have fun
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Old 06-07-2006, 07:22 PM   #17
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Corrected link:
GM -- Diesel Place
And to be P.C. ... Fords: Diesel Stop
And Mopar: What-evah

Ruh-roh Scoob, they're getting closer .... . No really, one of my best friends owns a 6-cylinder never-fail Dodge and swears by it. I honestly don't know their online forum. Soliciting best advice .... puh-lease?
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Old 06-07-2006, 07:45 PM   #18
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Quote:
Originally Posted by Canoe stream
Corrected link:
GM -- Diesel Place
And to be P.C. ... Fords: Diesel Stop
And Mopar: What-evah

Ruh-roh Scoob, they're getting closer .... . No really, one of my best friends owns a 6-cylinder never-fail Dodge and swears by it. I honestly don't know their online forum. Soliciting best advice .... puh-lease?
Mopar = www.Dieseltruckresource
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Old 06-10-2006, 08:36 AM   #19
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As you all had stated the computer had to be re-set. And we were soooo lucky the warranty was out by a few months but since the mileage was within the limits the dealership went ahead and fixed it for free guess it was my lucky day
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Old 06-10-2006, 11:12 AM   #20
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Chevy 2500 HD question?

Greetings Becky!

Quote:
Originally Posted by rebel beck
As you all had stated the computer had to be re-set. And we were soooo lucky the warranty was out by a few months but since the mileage was within the limits the dealership went ahead and fixed it for free guess it was my lucky day
Based upon my experience, it was fortunate that your dealer was willing to work with you based upon my experience. The only recurring problem that I have had with my '99 GMC K2500 Suburban has been with the electronic transfer case control board that was part of the automatic 4WD system that was a new standard feature for '99 on my 4WD Suburban. Beginning at 34,000 miles, this electronic circuit board has routinely failed at approximately 10,000 to 15,000 mile intervals (I purchased the truck new, and it now has 162,000+ miles on the odometer). During this time, the circuit board has been replaced under warranty (12-month/12,000 miles on the replacement circuit boards) all but two times. The two times when I have had to pay for the replacement, the cost has been close to $700 for the part and labor.

I watch the mileage/time very closely, and when the warranty on the part is nearing the expiration of its warranty I make it a point to cycle the truck through all of its 4WD options (Auto-4WD, 4-Hi, 4-Lo, and 2-Hi) -- several time a week. My last repair on this system was at 154,000 miles, and the warning light illuminated when I had to select 4WD on Thursday to navigate dew covered grass in the camping area where I was parked -- I haven't been able to get the truck out of 4-Hi since then so will be taking it into my GMC dealer for what will likely be another circuit board replacement -- hopefully it won't take 10-days to get the replacement board this time.

I hope that your fortunes with the GM 4WD electronic controls is better than mine has been.

Kevin
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Old 06-10-2006, 01:58 PM   #21
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Wow, after reading all these tales of woe, I am glad I got the good old fashioned shift lever on my 4X4.

I am getting 23 mpg mixed/around town/some freeway, about 31 mpg freeway, 70-80 mph, with propane on. Cost per mile is about the same, sometimes less, sometimes more, depending on cost of propane and diesel. My cruising range is 800 miles per tank of diesel and gas. So I can plan my fuel stops at the most economical stations.
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Old 06-10-2006, 03:57 PM   #22
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[quote=Pick]Wow, after reading all these tales of woe, I am glad I got the good old fashioned shift lever on my 4X

Pick , Overlander64 has a whole different animal . The 2500HD dosn't come with that system(automatic 4WD).We have electronic switch 4WD . The part that goes bad is about 50 bucks.
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Old 06-10-2006, 04:12 PM   #23
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Hi All,

I just got back from Jackson Center with my 86, 32' Excella on the back (2400 miles round trip) and I averaged 15 mpg! I get the same towing Pearl (54, 21' Flying Cloud) and I thought the bigger trailer would take more fuel! The big guy just likes pulling trailers and doesn't seem to mind which one!

Patti
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Old 06-10-2006, 05:01 PM   #24
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Great Mileage...

Quote:
Originally Posted by Pearl54FC
Hi All,

I just got back from Jackson Center with my 86, 32' Excella on the back (2400 miles round trip) and I averaged 15 mpg! I get the same towing Pearl (54, 21' Flying Cloud) and I thought the bigger trailer would take more fuel! The big guy just likes pulling trailers and doesn't seem to mind which one!

Patti
What was your average highway speed?
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Old 06-10-2006, 11:38 PM   #25
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I have the GMC 2002 HD2500 crew cab Duramax Allison with hard shell taneau cover.
Solo I get 19-21 mpg depending on how easy I am with it enjoying the acceleration of all that torque...(sure is hell on tires) and if I am doing 70ish mph or 80ish mph affects it.
Pulling the 1984 Excella 31 ft, I get 14ish if I am 60ish mph, and 12 if I am 70ish mph on speed.
Ken, sounds like you may have an incorrect code on your injector pump, or you may be in the early stage of injector seat failure on one or more of them.

My injector seats washed out starting at about 80,000 miles and in a space of about 2000 miles, I went from 19-21 mpg to less than 11 and the crankcase full of diesel instead of oil and oil all over the undercarriage of the truck displaced out the slobber vent. My injectors were fully warrantied and continue to be warrantied to 200,000 miles on a recall. A dealer in Denton TX repaired my troubles and provided a rental all at no charge. I was on a trip and it screwed up my schedule, but it all turned out ok with no apparent damage to the truck as it now has almost 100,000 miles on it.
So, keep careful watch on your oil level....if you start "making oil" you may be in the early stages of injector seat failure. I hope not, but just a thought.
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Old 06-11-2006, 09:13 AM   #26
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Quote:
Originally Posted by dscluchfc
Ken, sounds like you may have an incorrect code on your injector pump, or you may be in the early stage of injector seat failure on one or more of them.
David,
Which of us Kens are you replying to? I'm pretty sure the injecter problem was fixed when my late 04 LB7 was built.

Ken
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Old 06-11-2006, 10:56 AM   #27
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Quote:
Originally Posted by silverback
David,
Which of us Kens are you replying to? I'm pretty sure the injecter problem was fixed when my late 04 LB7 was built.

Ken
Don't count on it , not as many as '01-'02 , but some are still having problems.
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Old 06-11-2006, 11:12 AM   #28
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Quote:
Originally Posted by silverback
David,
Which of us Kens are you replying to? I'm pretty sure the injecter problem was fixed when my late 04 LB7 was built.

Ken
Silverback,
I'm pretty sure he's talking to me... I asked you the low fuel mileage question, and if you thought the bed cover or the Banks contributed most to your sweet mileage numbers.

I'm only getting 13.3 pulling my 31' Sovereign at 65-72 mph in the wide open spaces of NM, AZ, and UT. In the mountains of CO, where average speed is more like 55-60, I still get 13.3. In four wheel drive dragging a Jeep on a trailer in and out of the wildereness, I get 13.3. Around town not towing, I get 13.3. I have never taken a road trip without a trailer, so I don't have data for non-towing highway. I have a 2005 4X4 Crew Cab, short bed,with fewer than 10,000 miles. Should I have the dealer check it out?
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