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I have an 1987 gmc jimmy s15 with a tbi 2.8 v6 with about 201000 miles on it.I've been haveing a few issues with a bad miss and revs at idle and now is blowing black smoke. I've changed the plugs and wires but to no avail the problem is still there.

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  • 57 Answers

Bad miss & erratic idle can be the T.P.S. had the same problem on an 89 S10 & 91 Sonoma. As for black smoke sounds like oil in cylinders. If the truck has REALLY bad blow by & REALLY worn P.C.V. Valve that can make it smoke too. If not then probably the piston rings with that many miles.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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  • 255 Answers

SOURCE: i have a gmc jimmy

Hi,you can re check timing, run compression test,

Posted on Aug 23, 2008

brainyass
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SOURCE: sputtering during idle blue smoke

You are burning oil, causing the blue smoke. It is mainly cause by worn piston rings. Also will coat your spark plugs with oily residue. Try an oil additive such as "stop smoke" or another such brand to reduce burning your oil and it may recondition your seal sand stop it all together.

Posted on Nov 20, 2008

  • 71 Answers

SOURCE: 92 chevy truck 5.7 idle revs up and down high emissions

sounds like a vacuum leak check hoses and manifold

Posted on Mar 28, 2009

mkv0525
  • 358 Answers

SOURCE: I have 96 gmc 350 vortec. missing really bad. Ive

ou need to check compression on all the cly. do you know which cly is dead?

Posted on Jun 12, 2009

  • 1 Answer

SOURCE: 1991 s15 4.3 TBI jimmy will not idle

I had this problem also and it turned out to be egr solenoid

Posted on Feb 20, 2010

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Where is the fuel pump relay for a 1991 gmc jimmy?


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