94 Explorer Spark Knock? | Ford Explorer Forums

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94 Explorer Spark Knock?

Drg racr

Well-Known Member
Joined
November 18, 2006
Messages
244
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0
City, State
Dublin, Indiana
Year, Model & Trim Level
2001 Explorer XLT 2WD
My 94 has a pronounced spark kock when it's warm upon acceleration. You can't hear it when it's cold, or under normal driving/low rpm. I accessed the computer and it's flashing a 33 or 133 code. I looked it up and it said the EGR valve is non-functional. Could this be the problem? Maybe a coolant temp sensor also? I'm just grabbing straws here.
It also has the clunk noise another member asked about, so I'll check the radius arm bushing on that one.
Thanks
 






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