Question about 1999 Chevrolet S-10 Pickup

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Misfire problem I've got a 1999 sonoma truck with a misfire. Distr. cap, wire and coil have been replaced. Ditributor vent is clean. If the weather man annouce rain or snow the truck seems to or by time i think the truck called the weather man to annouce the precipitation! those 4.3 v-6 engine are good engine but i've come throw a fiew that had the same problem. I've ask around but it seems like theres no fix!

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  • oldrig Mar 04, 2009

    I've tried to retrieve the code; no code. Code sets only during damp condition. I replace the distr. cap again and I applied a coat of copper plate with a brush, + covered the cap with a piece comming out of a tube (tire tube). Weather is nice right now, waiting for rain or snow storm! I'll keep in touch don't worry.

  • oldrig Mar 05, 2009

    Acording to the GM Service Bulletins #03-06-041A and #05500 it seems that no cure from their parts should be expected! For the owner of that vehicle damnation is close.... Is their a special distributor cap made of material coming from N.A.S.A Space Shuttle available?

  • oldrig Mar 11, 2009

    Right now, weather is nice and the S.E.S. is on. I've retrieve the code...PO 300. the tach is jumpy when it misses; about 200 rpm i would say.

  • oldrig Mar 15, 2009

    From you're point of view; I should try a crank sensor. I'm scaptical ! A crank sensor cost a 1oo dollars. Expensive for a try. I'll try to find a use one for a try. I don't know if a c.s. coming out of a V-8 is the same one.The problem that I encounter only acts in winter! summer time...I forget the miss... That's why the c.s....I don,t know...

  • carhob May 11, 2010

    is your code p0300?random missfire!

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  • Master
  • 4,669 Answers

Is your tachometer jumpy when it misses?

Posted on Mar 08, 2009

  • Clint Smock
    Clint Smock Mar 11, 2009

    I have had a problem with the crank sensors on these. If it misses and has a jumpy tach, replace the crank sensor. I have had a couple of these with this problem.

  • Clint Smock
    Clint Smock Mar 16, 2009

    Try giving the crank sensor more air gap. Put an o'ring around the sensor before you stick it in the hole. I fixed 1 with this solution, maybe it will work for you. And it might save you the money on a new one.

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