Thread: What would cause spark knock on a cold engine ('91 Escort)?
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Old 06-16-2009, 02:21 AM   #9
Davescort97
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Re: What would cause spark knock on a cold engine ('91 Escort)?
I might add that incorrect plugs will make it knock, but so will a faulty PCV valve or a vacuum leak. Check the rubber hose running from the PCV to the intake and make note that the 90 degree elbow is known to crack.
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