99 grand marquis high idle

1999 MERCURY MARQUIS
103,000 MILES • V8 • 2WD • AUTOMATIC
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OSCAR7410
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  • 2 POSTS
99 grand marquis LS stayed high idled after throttle body cleaned.
May 15, 2011 at 6:56 PM
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PROTECH1980
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  • 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.
May 15, 2011 at 8:00 PM
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OSCAR7410
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  • 2 POSTS
How do i clean the iac? What do i use to clean it?
May 15, 2011 at 8:23 PM
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