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What could cause low compression in all cylinders of a 1986 Isuzu Trooper with an inline 4?

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2006-11-20 13:28:48
2006-11-20 13:28:48

AGE ! if it is low compression and not no compression then your piston rings and valves are worn too much and the engine probably needs to be rebuilt.

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Isuzu Trooper was created in 1981.

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I'm not sure of the exact values; they should be in your Haynes repair manual. However, if you compression test all of the cylinders and find one that is lower you have a compression problem with that cylinder. It is also possible to have 2 that are lower, this would most likely indicate a warp in the head between those two cylinders. Other causes for compression loss are damaged or gunked up valves that do not close all the way or a crack in the head.

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