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Hi I recently replaced a head gasket on my 98 cavalier 22L and since Ive had a really bad idling problem On startup it idles really low like its about to die and the engine shakes really bad But after maybe 20 seconds the rpms go through the roof It starts idling at about I would guess 4000 rpm I don't have a rpm meter but it concerns me that even just starting it without driving anywhere is going to cause another very bad problem please help I never messed with the throttle body or idle air control valve while fixing it And I don't know what or where the vacuum lines are to check them but it seems to be a lot worse than just a leak

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Check that you have connected all wires properly. Run fault codes to find the sensors that are affecting the engine running properly. If you have disconnected the battery the you may need to reset the CPU program with a code reader as the program may be corrupted.

Posted on Mar 18, 2014

  • 1 more comment 
  • Dacota Fox
    Dacota Fox Mar 18, 2014

    Thank you very muchfor your help and input Bill I will check it as soon as possible

  • Dacota Fox
    Dacota Fox Mar 19, 2014

    Dude I checked it and you were absolutely right There was a sensor on the back of the throttle body that came unplugged I didnt think to check it because I never messed with the throttle body while changing the head gasket but I guess when I dropped the intake back agaisnt it it slipped out Sorry to waste your time and thank you very much

  • Bill Boyd Mar 19, 2014

    hey bud you haven't wasted my time and I was glad to give some information that pointed you right, Thanks for the come back

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Posted on Jan 02, 2017

  • 66 Answers

SOURCE: Shaking at idle

ck cyl compression cyl 2 or 3 is not fireing also could be stopped up intake

Posted on Dec 18, 2008

  • 150 Answers

SOURCE: idle at 1500 to 2000 rpm

Most likely the throttle body gasket (between the throttle body and the intake manifold) is leaking.

Posted on Feb 12, 2009

  • 295 Answers

SOURCE: 1997 DODGE RAM 1500 360 VERY LOW IDLE

I think you have ruled out the engine with all the parts you have replace. The transmission torque convertor is in lock up mode all the time. The engine is having to hard of a time to stay at the normal idle. The over drive clutches and soleniod are most likely damaged in the transmission.
I think you should take the vehicle to a trasnmission shop , The can check the torque convetror soleniods and pressure control soleniod.

The oil light coming on bothers me. I know you have the rebuilt engine in the vehicle but I think the oil pump in the engine is starting to go out or could be weak. The lower bearings connected to the crank shaft might be starting to leak. Have the oil pressure checked .

Posted on Mar 19, 2009

  • 39 Answers

SOURCE: 1999 saturn sl1 rough idling

a pit\ston might not be working properly

Posted on May 29, 2009

  • 72 Answers

SOURCE: ford freestar, idle is wierd,

try a tune up

Posted on Jun 11, 2009

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Locate the TBI assembly ( follow the air intake tub from the cor support back. It leads directly to it ). Next look on the lower left side of the TBI just above the throttle linkage connection to the TBI.
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