Question about 1995 Jeep Grand Cherokee

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Valve knocks when running reaches 1500 rpm

I have a 1995 model Jeep Grand Cherokee Laredo 4.0 L. My valve tapet starts to knock when vehicle running reaches 1500 rpm. I have replaced rotor, distributor cap, plugs, high-tension wire, temperature sensors and TPS. What is wrong with my engine? I intend to replace intake manifold air temperature sensor and manifold air pressure sensor, will it eliminate my problem?

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First, nothing you have done has anything to do with valve tappet noise. What is your oil pressure? Have you positively identified the noise as a lifter (tappet), OR COULD IT BE AN ENGINE BERARING OR WRISTPIN? Other than tearing it down and replacing lifters, rockers or pushrods or possibly even the cam, if oil pressure is good, change the oil and put a quart of Marvel oil in there. If that does not clear it up in a few days, you will have to go inside the engine. You likely have over 160k on that engine...consider using a replacement. Get an older tech to listen to it...it takes years to be able to differentiate between different component noises with any accuracy.
Personally, without hearing it myself, I'm betting it's a rod knock.

Posted on Feb 20, 2009

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