1999 Pontiac Sunfire Reving

1999 PONTIAC SUNFIRE
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DEZZIE41
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Engine Mechanical problem
1999 Pontiac Sunfire 4 cyl Front Wheel Drive Manual 145xkm miles

ok heres my problem..i just put in a new motor in my sunfire GT 2.4L the new motor has 145000 KMS on it..i noticed this morning when u start it and after the engine cools down all the way..that when u start it when it is all the way on C on the guage it like to rev its slef up and down between idel and 2600RPM until the temp guage is off C...wut could that be an indication of>???

Thanks
Mar 1, 2009 at 5:23 PM
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F4I_GUY
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This could be an idle air control valve acting up. This valve controls an air passage while your throttle plate is closed. If you hold the throttle down a bit and the vehicle stops surging it is usually an IACV issue.

You can try cleaning the valve/ports/ throttle body first to see if this does any good. If not, you may have to replace the valve.

You should also check for vacuum leaks.
Mar 5, 2009 at 2:12 PM
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DEZZIE41
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tyhere are no leaks in vac lines...and she only does it whene shes codl i cant figure it out
Mar 5, 2009 at 3:11 PM
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F4I_GUY
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It's probably the IACV then.
Mar 5, 2009 at 6:01 PM