Question about 1994 Jeep Grand Cherokee

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I have a 94' Jeep Grand Cherokee Laredo. I have white smoke when ever I'm stopped or parked, and it idles a little rough at those times also. I've changed the plugs, spark plug wires, valve cover gasket, air filter, oil, and oil filter. Please help me to resolve this because I love this truck. Matthew.

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White smoke generally indicates a blown head gasket or cracked cylinder head, permitting coolant to enter the combustion chamber. You may see a small amount of antifreeze on spark plugs, or, you may see a loss of compression in one, sometimes two adjacent cylinders. Have you had any unexplained coolant loss?
If smoke is present, does it do this all the time or only when first starting? (don't forget, water vapor is a by-product of combustion) Watch other vehicles...is yours smoking more than theirs?
Other than this, intermittent rough running can be caused by nearly anything in either the fuel or ignition system. You will need to check codes and do testing to determine which system(s) need attention. Your spark plugs can also be a good reference when testing. After plugs have been in service for a while, they should all have pretty much the same colouring on the insulator surrounding the electrode...any variation is a clue to which cylinders are malfunctioning.

Posted on Jan 31, 2009

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