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1991 Jeep Cherokee, 4x4,b inline 6 engine, Laredo edition

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1991 Jeep Cherokee, 4x4,b inline 6 engine, Laredo edition

Old 04-13-2019, 08:08 PM
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Default 1991 Jeep Cherokee, 4x4,b inline 6 engine, Laredo edition

Just bought my Cherokee. Has a nocking sound coming from the engine area. Don't know exactly what is wrong with it. A friend said it was a piston but want to know if someone has a different opinion before we start pulling engine apart. Any ideas are helpful.
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Old 04-13-2019, 08:23 PM
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Welcome to CF Libromason !

Really hard to tell you what a knock is without hearing it. There are several things it could be. one yes is piston slap does it change when warm? is only at idle? only when hot/warm?
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Old 04-14-2019, 04:00 AM
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Default Nocking sound

It sounds like a rock hitting inside the engine area. It's starts when the Jeep is warmed up and that's in idle. Also at low speeds. But if I hit the gas or drive at a higher speed roughly 30 mph it goes away. I've googled it and I found out it could be one of three things, flexplate bolts are loose? The converter is bad? Or a bad piston or valve stem?
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Old 04-14-2019, 04:01 AM
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My uncle who works on cars said its a piston or the flexplate. My friend thinks it's the valve stem.
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Old 04-14-2019, 09:28 AM
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First thing I'd do is tighten the flexplate bolts.

https://www.cherokeeforum.com/f51/ho...ocking-125547/
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