Question about 1999 GMC Sonoma

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99 Sonoma. engine light

99 Sonoma. Occasionally would "shudder" when starting to drive, usually up to around 30km/hr. Would eventually stop. Today in heavy rain did it again, then after going through large puddle the engine light now on. Ideas?

Being Sunday I can't get code read. Hoping to tomorrow if I can find a free read. Being recently unemployed this is the last thing I need!

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  • lukewarmail Jul 27, 2009

    It is (was)the light that looks like an engine. Don't have a/c (I wish!)

    Funny thing...I was just out again, and the rain has stopped. Drove about 1 minute, the engine light went out. Weirder, when the light was on there was no 'shudder' when I was driving either? I would have thought if light was on it would be worse?

    Last year I had new plugs, wires and cap replaced, but it had similar symptoms at that time too. Something else was fixed but I will have to ask my brother what it was, I am not good remembering car things...

  • Joe Alexander
    Joe Alexander May 11, 2010

    when you had the cap replaced did anyone check the ignition control module?

  • Joe Alexander
    Joe Alexander May 11, 2010

    is it the engine light or the charging light also if equipped does the a/c work?

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HAD A SIMILAR PROBLEM A COUPLE OF YEARS BACK.

THE SHUDDER INITIALLY MADE ME THINK DRIVELINE..U -JOINTS..

TURNS OUT IT WAS ELECTRICAL.

MY SPARK PLUG WIRES.

COULD BE THAT OR YOUR PCM/ECM.IS ALLOWING MOISTURE IN, BAD SEAL.

IF YOU TRY THE WIRES, GET GOOD ONES AND SLEEVE THEM.

A CODE READER IS THE WAY TO GO WITH THE PCM/ECM.

SOME MANUFACTURES DON'T LOCATE/ PROTECT THE PCM/ECM ANYWHERE NEAR ENUFF FROM EXPOSURE TO WATER, ROAD SALT/MOISTURE.



IF YOU GO THAT ROUTE

GET GOOD ONES AND MAKES SURE YOU SLEEVE THEM.

Posted on Oct 02, 2009

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