Thread: 1991 ZR1 engine knocking on idle
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Old 04-21-2022   #6
Z51JEFF
 
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Join Date: Dec 2007
Location: Fremont,Ca
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Default Re: 1991 ZR1 engine knocking on idle
Keep in mind one of the O2 sensors is a real hassle to change. The knock is caused by injectors or spark.
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