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2003 Ford Mustang Q&A

Tiny
BBAYNARD
  • MEMBER
  • 2003 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 102,000 MILES
My mustang won't keep a steady idle. It runs from 700 to 1500 at times. The cars been doing this for 4 plus months now, in summer and now winter. It changes on a whim. I asked Bobby kurgan a NMRA Champion that owns a shop and he said it could be a vacuum line but I can't find a bad one. The car has no codes could you help me?
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Monday, December 22nd, 2008 AT 3:37 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Could be a vaccum leak somewhere, best way to test that is to use a smoke tester, carb cleaner works well too but isnt no where as easy and conclusive as a smoke test.

Clean out your throttle body also, and your iac module, check the pintle should be moving freely.
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Saturday, December 27th, 2008 AT 9:09 AM

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