Somkes under accelaration 6.5 Diesel

ROB.KELA

MEMBER
1996 GMC SIERRA
118,000 MILES

This truck has a lot of black smoke comming from the exhaust when you rev it up or just going down the road. If you could give me some pointers on where to start diagnosing this that would be great.

Sunday, May 13th, 2012 AT 2:50 PM

6 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Most common issue is the injectors? How old are they and when did you have them serviced last?

If the injector timing is off, that will cause smoke as well.

Also, fuel quality is another factor. Old, bad low cetane fuel will do the same thing.

Roy

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Sunday, May 13th, 2012 AT 2:53 PM

ROB.KELA

MEMBER
21 POSTS

Changed a fuel solinoid driver also instaled a 8 or a 9 chip the stock was at a 7 does that effect it.

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Sunday, May 13th, 2012 AT 4:22 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

The driver, no, the chip should not effect it. Is this a turbo? If it is, there is another reason it may smoke as the seals may be bad and oil may be going out the turbo into the exhaust.

Roy

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Sunday, May 13th, 2012 AT 4:28 PM

ROB.KELA

MEMBER
21 POSTS

Yes it has a turbo, is it posible the fuel lift pump is bad is there a easy way to check it, the injectors are original. The injector pump was changed at 80,000 after the fsd was changed it stiil never semed right. It is not consuming any oil it seames its getting to much fuel. Thanks

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Tuesday, June 12th, 2012 AT 12:15 AM

ASEMASTER6371