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1995 GMC S15 spark still everywhere

Tiny
IINVNO1
  • MEMBER
  • 1995 GMC S15
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
Would this cause the vehicle to idle rough? Also on the highway it seems to run fine plenty of power and such but when we go hunting it loads up and when given gas black smoke pours out exhaust and most of the time will clean up. But sometime plugs foul out and need cleaned does this sound like a valve prob? Or spark?
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Thursday, November 6th, 2008 AT 7:52 PM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
HI there,

Faulty spark plug leads will arch out and cause rough idle and miss fire, replace with good quality leads and see how you get on.

Mark (mhpautos)
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Thursday, November 6th, 2008 AT 7:57 PM
Tiny
SWILLIAMS
  • MECHANIC
  • 597 POSTS
I would also suggest looking into the intake manifold for a leaking injector unit or a failed fuel line to the injector. The extra fuel caused by the leak would also cause those symptoms and is a common problem with the CPI units.
The good thing is that the unit is easy to get to and check. The bad thing is that the replacements are not cheap.
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Sunday, November 9th, 2008 AT 10:33 AM

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