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99 Grand Marquis high idle

Tiny
OSCAR7410
  • MEMBER
  • 1999 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 103,000 MILES
99 grand marquis LS stayed high idled after throttle body cleaned.
Monday, May 16th, 2011 AT 1:56 AM

2 Replies

Tiny
PROTECH1980
  • MEMBER
  • 901 POSTS
Check for possible vaccum leak, loud hissing or sucking sound in and around engine compartment, if checks ok, try to clean IAC and see if idle changes, if not replacement may be necesary.
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Monday, May 16th, 2011 AT 3:00 AM
Tiny
OSCAR7410
  • MEMBER
  • 2 POSTS
How do I clean the iac? What do I use to clean it?
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Monday, May 16th, 2011 AT 3:23 AM

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