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How to check/ replace idle air control valve?

Tiny
BLUEYEZCA
  • MEMBER
  • 1993 OLDSMOBILE
  • 3.8L
  • V6
  • AUTOMATIC
Rough erratic idle but no trouble codes. Tps just replaced, air filter new, no hydrocarbons in coolant, pcv valve good. At first would run great until car began to warm up in slightest bit, but now it just idles rough & inconsistent when stopped or in park. Unsure how to clean intake/throttle body. I do need to replace two u-shaped rubber hoses that are to the left of the tps and air filter connector hose. Look like vac lines, but possibly part of idle air control? Please help
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Thursday, August 7th, 2014 AT 8:08 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is unlikely to be an IAC as if they are an issue the engine normally just cuts off. This sounds more like a vacuum leak.

However, I will attach the IAC info below.

Here is a guide that will help with checking for a vacuum leak as this is where I would start:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please see the info below on how to replace this so let's run through this and let me know what you find.

Thanks
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Tuesday, March 8th, 2022 AT 4:44 AM

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