Question about Chevrolet Astro

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Put new plugs, wires,cap & roter on a 1996 chev astro 4.3 vortec, all a/c delco parts, ran great for two days now have a miss fire on #6 took to a small garadge with a hand held read out, computer says all fine, they tried a few things but couldnt fix it, what can i try.

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  • mdorosz Jul 08, 2010

    I will check all the mentiond and see if any of then are the reason for the misfire. Thanks.



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Mis fire on cylinder 6 or on any cylinder is related to this possibilities. As you mentioned you have replaced the wires and parts but for this problem get the voltages checked on each cylinder also interchange the cylinder connectors and check if the cylinder 6 is properly firing.Also check the voltage at each coil one by one.The spark plugs gets power to spark from the coil pack.If the coil pack is not providing proper power that cylinder will misfire.

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 08, 2010


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If you are sure they said, a distributer cap a roter and a distributer, there is a problem! Because on a 1998
plymouth, there is no distributer or cap or roter.
Your cam sensor along with the crank sensor-temp sensor and a few other sensors, send a signal to the
powertrain control module, that sends a signal to the
coil pack(that you said was replaced) that fires the
spark plug. I would hold off from having any further
work done there, until you can check out what they
say they have already done. Ask if you can have the
old parts they replaced so far. You will want to have
an OBDII scan test done, to see what codes come up. It should have one of the first tests they did.
If I have read your post correctly, have them write an
estimate for what they will replace next. This info. is
based on the car being a 1998 plymouth and not a
1988 I would not wan't to acuse somone of anything
based on a typo. Hope this helps. Good luck.

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