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1990 Pontiac Bonneville idle air control motor

Tiny
BALLD72
  • MEMBER
  • 1990 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 65,000 MILES
The plunger on the iac motor runs in and out with the ignition off. I heard a noise under the hood, pulled the iac and found the plunger going in and out. Now what?
Friday, August 28th, 2009 AT 7:40 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS


https://www.2carpros.com/forum/automotive_pictures/62217_bonnIAC_1.jpg


1. Disconnect harness connector to motor. Check resistance across IAC coil terminals "A" to "B" and "C" to "D". Resistance should be 40-80 ohms. See Fig. 12 . If okay, go to next step. If resistance is not as specified, replace IAC motor. 2. Check resistance between IAC terminals "B" to "C" and "A" to "D". Resistance should be infinite. If resistance is not as specified, replace IAC motor.
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Friday, August 28th, 2009 AT 7:46 PM

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