Mechanics

99 GRAND HIGH IDLE

1999 Mercury Marquis • V8 2WD Automatic • 103,000 miles

99 grand marquis LS stayed high idled after throttle body cleaned.
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Oscar7410
May 16, 2011.



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.

PROTECH1980
May 16, 2011.
How do I clean the iac? What do I use to clean it?

Tiny
Oscar7410
May 16, 2011.