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Old 8th April 2006, 13:55
holgate86 holgate86 is offline
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Join Date: Apr 2004
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Default hunting at idle

The Sierra injection engine has common problems relating to idle faults, firstly the throttle butterfly and idle valve get carbon deposits buiding up over time and require a thorough cleaning with good carb cleaner. There is a mod on the butterfly that ford recommended which is to drill a 2mm hole through it, if it hasn't already got a hole that is (this is a known cure as I have done many in my daily job). There is a procedure for setting the throttle stop depending on the year etc, is it sohc or dohc. The idle valve may need to be replaced if the hunting doesn't stop. The misfire is probably unrelated to idle problem and it's worth checking all the ignition components or just replace them if they're getting old.


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