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I have a 2001 C3500 HD that is running very rough,
I have a 2001 C3500 HD that is running very rough, backfires, and no power. Won't go over 2500 rpms. Could it be the throttle position sensor? I've changed every sensor but the TP sensor. … read more
Amedee
Amedee
Automotive Consultant
Vocational, Technical or Trade Scho
19,701 satisfied customers
I have a 2010 gmc 2500 w/ the 6.6 duramax. The enigine acts
I have a 2010 gmc 2500 w/ the 6.6 duramax . The enigine acts like it has water in the fuel. The throttle is sluggish , a lot of black smoke , won't go over 15mph. I already changed the water / fuel fi… read more
Ethan Lankford
Ethan Lankford
Self Employed
Diploma
174 satisfied customers
My fuel filter goes from 100% to 0 in about 3 weeks. This is
My fuel filter goes from 100% to 0 in about 3 weeks. This is the second time it has happened. Don't know what the issue is … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
55,773 satisfied customers
Pete what I had found out was that my 94 gmc 5.7 had jumped
good morning Pete what I had found out was that my 94 gmc 5.7 had jumped timing I had put the crankshaft to zero nd saw that the camshaft was pointing showing the mark was at ten while the crankshaft … read more
Pete
Pete
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General auto certifications
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I have a 5.7 g2500 vandura I have added a new pump new carb
hello I have a 5.7 g2500 vandura I have added a new pump new carb I have checked the fuse ok I put in a new pump relay new oil sensor I have tried hot wiring the pump it comes on so it does work I don… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
I hava 94 gmc g2500 vandura my fuel pump is nd so is my carb
I hava 94 gmc g2500 vandura my fuel pump is nd so is my carb but is not pumping nor does my carbs injectors I have changed the pump fuse nd the pump rely plus the oil sensor… read more
Tim\u0027s Auto Repair
Tim\u0027s Auto Repair
Mechanic
High School or GED
14,755 satisfied customers
I have a 2012 gmc 2500 6.6 duramax in my shop, it is a no
I have a 2012 gmc 2500 6.6 duramax in my shop, it is a no stsrt but will crank over. Customer drove truck ,stopped shut truck off ,went to re start and would crank but not start. I have no 12 power at… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,838 satisfied customers
Wont start!! it cranks, 2002 gmc sierra 2500 hd new injector
I put a fass 150 lift pump. rebuilt the filter head. new fuel filter new injectors and new cp3 Cranks at 180 rpm and I only get 1.2kpsi rail pressure … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
55,773 satisfied customers
Just added performance injectors and now I have no power. I
Just added performance injectors and now I have no power. I have a 2006 duramax … read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
55,773 satisfied customers
250,000 miles normally running fine ,suddenly lost power and
250,000 miles normally running fine ,suddenly lost power and started to blow white smoke after stopping and then eccelleration, tends to lighten up after driving for a time. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
965 satisfied customers
Resetting the exhaust fluid light on a 2500 hd, we replaced
we replaced the reductant heater and float and the light for exhaust service is flashing and truck cant go over 55 … read more
BOBBYSS
BOBBYSS
Automotive Repair/Damage Investigator
Associate Degree
14,595 satisfied customers
Ok, 2008 6.6 duramax diesel, what's been done so far,
ok, 2008 6.6 duramax diesel, what's been done so far, replaced injectors, replaced injection pump, replaced ecm. vehicle has been modified from stock. after market exhaust and intake tubes. only codes… read more
Tool Hut
Tool Hut
Owner
519 satisfied customers
On a 2004 GMC 2500 HD witha 6.6l diesel engine, I am getting
On a 2004 GMC 2500 HD witha 6.6l diesel engine, I am getting smoke from the tailpipe at idle, not so much while moving.It acts like it has a slight engine miss, but you really have to pay attention to… read more
Wayne Auto
Wayne Auto
47 satisfied customers
I have 91 GMC Serria, 4WD 2500, with a 5.7, automatic trans.
I have 91 GMC Serria, 4WD 2500, with a 5.7, automatic trans. My problem is I can start the engine and in neutral or park I am able to rev the engine up just fine and it doesn't miss a beat, but when I… read more
Joe
Joe
Owner Kingsland Auto & Marine Services
Vocational, Technical or Trade Scho
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GMC Sierra 2500 HD Classic SLE: I have a 2007 GMC HD 2500 pickup
I have a 2007 GMC HD 2500 pickup with a duramax engine. lately it takes a lot longer cranking time than normal to start and under fairly hard acceleration it boggs for a few seconds then pulls hard as… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC 2500 Series: HI, Cam! i have a 2001 gmc sierra 2500 6.6
HI, Cam! i have a 2001 gmc sierra 2500 6.6 duramax. I have a starting issue, the truck at first started to take longer to start. it start fine in the morning but if i drove to the store i would have t… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
GMC Yukon XL 2500 SLT: 2002 GMC Yukon XL 2500 w/ 8.1L engine
2002 GMC Yukon XL 2500 w/ 8.1L engine cuts out. Did a Schrader valve check and the pressure was at 50+ and then rapidly dropped off. Had the Crank sensor and front pump about 40K miles ago. Replaced t… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
1,838 satisfied customers
my 04 gmc 2500 hd 6.6 duramax diesel is smoking white smoike
my 04 gmc 2500 hd 6.6 duramax diesel is smoking white smoike and smells like diesel at idel and is missing and running rough… read more
Randy
Randy
619 satisfied customers
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,838 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

55,773 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

291 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

234 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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