Choke or idle speed surging from fast to normal when first started and when AC and Heat is turned on.

Tiny
AIRFLIGHT
  • 1991 TOYOTA PICKUP
  • 140,561 MILES

When engine is first started something is making the idle speed surge to fast back to normal. After a few minutes the idle speed is normal.I also notice this when the AC and heat is turned on. The vehicle is a 1991 Toyota truck 4cyl, 4x4 5 speed manual transmission with 140561 milage. Thanks

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Friday, September 23rd, 2011 AT 11:49 PM

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Tiny
MHPAUTOS
  • EXPERT
  • 30,751 POSTS

I would first be checking that the IAC is not faulty, clean the throttle body, check any A/C idle up valve and get a scan done for any unresolved fault codes, start here.

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Saturday, September 24th, 2011 AT 1:42 AM

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