Poor acceleration - Chevy and GMC Duramax Diesel Forum
06-07.5 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 01-15-2013, 05:05 PM   eBay Motors  #1 (permalink)
 
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Poor acceleration

I have a 2007 GMC Sierra Classic with a 6.6 Duramax and a 6 spd Allison trans. The engine light comes on after driving for 5 to 30 minutes and I lose acceleration power. The engine will only tach up to 1800-2000 RPMs even in neutral. The manual shift selector displays all 6 gears but I cannot downshift with the control buttons. I can get up to speed if on a flat or downhill grade but not on inclines. It hasn't left me sitting but I am worried that it may soon. I replaced the spin off trans filter after receiving that suggestion from an online forum. It didn't make a difference. Any idea what the problem is?
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Old 01-15-2013, 05:10 PM   eBay Motors  #2 (permalink)
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We need the codes.....If you have a P0700 in the ECM, Check for codes in the TCM.
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K&N intake tube w/ stock box, Built trans, Michelin A/S.
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Old 01-15-2013, 05:47 PM   eBay Motors  #3 (permalink)
 
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Ok. I dont have a code reader but I believe Auto-Zone will check the codes for free. I'll do that tomorrow. Thanks.
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Old 01-15-2013, 05:58 PM   eBay Motors  #4 (permalink)
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When was the fuel filter changed last. How many miles are on the truck? Is the check engine light on?


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Old 01-15-2013, 06:17 PM   eBay Motors  #5 (permalink)
 
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The mileage is 205k. The check engine light comes on after driving for 5 to 30 minutes. Thats when the loss of acceleration happens. The fuel filter was changed not long ago. It is currently at 75%.
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Old 01-15-2013, 07:43 PM   eBay Motors  #6 (permalink)
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Any mods or all stock engine?
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Old 01-16-2013, 03:56 AM   eBay Motors  #7 (permalink)
 
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Its completely stock.
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Old 01-16-2013, 01:54 PM   eBay Motors  #8 (permalink)
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Your truck is going into limp mode. A number of things can cause this but without knowing what codes are coming up theres not much we can do. Mine did the same thing when I bought my truck 3 years ago, fuel filter, problem solved. Can't really go by the DIC for filter percentage since it could have been reset at anytime
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Old 01-16-2013, 04:24 PM   eBay Motors  #9 (permalink)
 
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Thanks. I picked up a fuel filter today in case I got some dirty fuel or the filter is just bad for some strange reason. I bought the truck new and have only had fuel filter concernes when I didn't change it after hitting 0%. I had the codes read today and got a P0087 code for fuel pressure too low. It also indicates something about the fuel rail. I didn't make a note of what the exact wording is. Looks like it may need to be repaired by a worthy diesel mechanic if it is within the fuel rail system. Ugh!
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Old 01-16-2013, 05:40 PM   eBay Motors  #10 (permalink)
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Change the filter first, Clear the code. A plugged fuel filter can cause a P0087.
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2006 Chevy LT3 CCSB 2500HD LBZ/Allison
AirDog 100, Nicktane CAT filter head, Billet bleed screw, Blocked EGR, Bilstein, AAM alum. diff cover, Michelin M/S2.

1985 Chevy C20 Suburban with a '04 5.3L/4L60E
K&N intake tube w/ stock box, Built trans, Michelin A/S.
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