Having problems with your 2004 GMC Envoy ?

What is a knock sensor - 2004 GMC Envoy

Posted / edited by AnonymousUser on : 15-04-2019

Answers :

Possible bad valve seats you may need a head or machine shop may b able to re seat valves
A knock sensor is what the computer uses to detect misfires
in other words the knock sensor tells the computer when u have a misfire and what cylinder is misfiring
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