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1999 Pontiac Sunfire Reving

Tiny
DEZZIE41
  • MEMBER
  • 1999 PONTIAC SUNFIRE
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
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Sunday, March 1st, 2009 AT 5:23 PM

3 Replies

Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
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.
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Thursday, March 5th, 2009 AT 2:12 PM
Tiny
DEZZIE41
  • MEMBER
  • 2 POSTS
Tyhere are no leaks in vac lines. And she only does it whene shes codl I cant figure it out
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Thursday, March 5th, 2009 AT 3:11 PM
Tiny
F4I_GUY
  • MECHANIC
  • 3,302 POSTS
It's probably the IACV then.
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Thursday, March 5th, 2009 AT 6:01 PM

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