Question about 1992 Chevrolet C1500

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93' 4.3 chev runs rough at times

Hard to start, have to floor it and when it starts runs rough for a mins then smooths out, run rough sometimes when driving around town

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  • jtschwable Mar 12, 2009

    ok ill try that also i forgot to add that i add some injector cleaner to my gas and it seemed to help would start on first crank and run fine then start up again half way threw tank

  • jtschwable Mar 12, 2009

    its a 93" not sure on the TBI or CPI

  • jtschwable Mar 12, 2009

    yes it has a round air cleaner

  • jtschwable Mar 13, 2009

    ok thanks im going to try it first thing in the morning

  • jtschwable Mar 15, 2009

    ok i checked the o rings and didnt see any leaks, and this morning on my way to work its starting to run rough alot more if i slow down at a light, also fuel filter and fuel pump has been changed in the last 6 months

  • jtschwable Mar 15, 2009

    no check engine light and with it being a 93 i cant check it my self

  • jtschwable Mar 15, 2009

    ahh i'll try that and see what i get thanks

  • jtschwable Mar 15, 2009

    ok all it flashed was 12 over and over

  • jtschwable Mar 15, 2009

    could it be my TPS, or would it throw a code if it was that.

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  • Master
  • 4,669 Answers

Have someone turn the key on while you watch the injectors. If any gas leaks out of the injectors, without cranking on it) replace the o'rings around the injectors.

Posted on Mar 12, 2009

  • 4 more comments 
  • Clint Smock
    Clint Smock Mar 12, 2009

    Wait a minute, is this a 1992 C1500 with a 4.3 TBI or a 1993 4.3 with TBI or CPI? This makes a big difference.

  • Clint Smock
    Clint Smock Mar 12, 2009

    Is it a C1500 with a round air cleaner on top of the engine.

  • Clint Smock
    Clint Smock Mar 13, 2009

    O.k. then it is TBI. Do the procedure that I posted first.

  • Clint Smock
    Clint Smock Mar 15, 2009

    Any check engine light?

  • Clint Smock
    Clint Smock Mar 15, 2009

    Yes you can, all you need is a paper clip. Jump terminals A and B of the ALDL connector and the check engine light will flash trouble codes.

  • Clint Smock
    Clint Smock Mar 16, 2009

    O.k. no codes. 12 means system O.K. Try starting with the coolant temp sensor unplugged.

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