Jeep Grand Cherokee owners have reported 37 problems related to engine clicking and tapping noises (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Jeep Grand Cherokee based on all problems reported for the Grand Cherokee.
The motor has a metallic type knocking or tapping noise that increases in rapidity as the rpm increases until it becomes a high pitched screaming type sound. The dealer refuses to accept this as a problem since other 1999 6 cylinder Jeeps do it also. However my 1996 Jeep with the same engine didnot make these noises.
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Have experienced numerous quality problems including the 4 wheel drive grinding and jumping, window function problems, rear washerhose leak into rear compartment, rough transmission into reverse from park, oil gauge failure and engine clicking noise during acceleration. Dealer on many occasions says they are normal for the truck to experience and not to worry. I don't believe them.