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Erratic idle

Tiny
HAL STEWART
  • MEMBER
  • 1988 DODGE RAM
  • 5.2L
  • V8
  • 4WD
  • MANUAL
  • 117,000 MILES
When I start the truck it immediately revs up (no tachometer) to sounding relatively high but then comes back down to a normal idle, temporarily. As the truck then continues to idle, the engine slowly slightly goes up and down, up and down, etc. The maintenance required light recently turned on also.
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Thursday, December 3rd, 2020 AT 11:45 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

There is a idle control motor that causes this issue. The gears inside strip out and the motor does not stay stable. The idle will go up and down.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

https://www.2carpros.com/articles/engine-idles-too-high

I attached a picture for you of the part on the throttle body.

Roy
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Thursday, December 3rd, 2020 AT 12:33 PM

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