1989 Mercury Cougar Idles High

1989 MERCURY COUGAR
154,000 MILES • V8 • 2WD • AUTOMATIC
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1989 Mercury Cougar mileage: 154,000. Our car started to idle at 2000 rpms after we steam cleaned the engine and we just did an oil change. Any suggestions?
Nov 19, 2010 at 11:35 PM
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Computer controlled engines with all the electronic sensors and motors do not like being wet. Therefore, they should not be steam cleaned. The moisture in the wire connections changes the resistance fed to the computer. Try disassembling the wire connections and drying them out.
Nov 19, 2010 at 11:37 PM