Somkes under accelaration 6.5 Diesel

Tiny
ROB.KELA
  • 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.

SPONSORED LINKS
Do you
have the same problem?
Yes
No
Sunday, May 13th, 2012 AT 2:50 PM

6 Replies

Tiny
ASEMASTER6371
  • EXPERT
  • 25,509 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

SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, May 13th, 2012 AT 2:53 PM
Tiny
ROB.KELA
  • MEMBER

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

Was this
answer
helpful?
Yes
No
Sunday, May 13th, 2012 AT 4:22 PM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,509 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

Was this
answer
helpful?
Yes
No
Sunday, May 13th, 2012 AT 4:28 PM
Tiny
ROB.KELA
  • MEMBER

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

Was this
answer
helpful?
Yes
No
Tuesday, June 12th, 2012 AT 12:15 AM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,509 POSTS

Lift pump just supplies fuel to the injector pump. It sounds like you have injector issues.

Roy

SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, June 12th, 2012 AT 12:24 AM
Tiny
ROB.KELA
  • MEMBER

Ok I just wanted to make shure I will order 450.00 In injectors for this thanks.

Was this
answer
helpful?
Yes
No
Tuesday, June 12th, 2012 AT 12:35 AM

Please login or register to post a reply.

Related Smoke Black Content

VIEW MORE

Recommended Guides