WHERE IS THE IDLE AIR CONTROL MOTOR LOCATED?

  • Tiny
  • l2wo4our
  • 1991 Cadillac Brougham
  • 159,000 miles

In a 1991 Cadillac brougham 5.7. I know its in the throttle, but I cant find it. Need the exact location need exact location of idle air control motor. Picture would help too.

Saturday, June 30th, 2012 AT 4:54 AM

15 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,555 posts

Round housing with a 4 wire connector on the throttle body.

Why are you replacing it?

Roy

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Saturday, June 30th, 2012 AT 4:45 PM
  • Tiny
  • l2wo4our
  • Member

Roy im replacing it because my car turns off on idle. It always turns back on for like 3 seconds then it just turns off. I happen to believe maybe its the idle air control motor. Any suggestions?

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Saturday, June 30th, 2012 AT 5:23 PM
  • Tiny
  • l2wo4our
  • Member

Wrenchtech thanks you so much that was very helpful.

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Saturday, June 30th, 2012 AT 5:24 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,555 posts

I would check for vacuum leaks at the base as the base gasket is a common failure for this issue.

Make sure the egr valve is not stuck open causing a massive vacuum leak.

And lastly, it could be the valve but can be tested with a scan tool to manually operate it.

Roy

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Saturday, June 30th, 2012 AT 5:26 PM
  • Tiny
  • l2wo4our
  • Member

*UPDATE* I already changed the idle air control valve (IAC) and the EGR valve and also the throttle position sensor along with the pcv valve. I put all these parts new and it still does the same thing. The car always turns on but turns off after 3 seconds. I dont know if its either a leak or something causing it to choke. It also drains the battery I always have to jump start it to turn it on every time. Please help.

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Monday, July 2nd, 2012 AT 8:00 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,839 posts

Have you tested the fuel pressure?

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Monday, July 2nd, 2012 AT 8:23 PM
  • Tiny
  • l2wo4our
  • Member

No I havent not yet

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Monday, July 2nd, 2012 AT 8:34 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,839 posts

That probably should have been the first thing you did.
It has to be 9-13PSI

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Monday, July 2nd, 2012 AT 8:39 PM
  • Tiny
  • l2wo4our
  • Member

So I checked the fuel pressure and its good I even changed the fuel filter. What I did notice was that the car only stays on when I disconnect the hose that runs from the back of the throttle to the map sensor, once I connect it back to the throttle the car shakes and it turns off. So I'm thinking maybe I have a bad MAP sensor, so I go and replace it brand new and it still does the same thing. It only stays on when I disconnect the hose from the throttle that goes to the MAP sensor. What could this be? And after I replaced the MAP sensor the check engine light went off. So I dont know what to do anymore? Any suggestions?

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Tuesday, July 10th, 2012 AT 10:56 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,839 posts

Try unplugging the the electrical plug for the MAP sensor and see if it will run any better.

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Tuesday, July 10th, 2012 AT 11:08 PM

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