Cylinder compression, 170--225 psi
100 psi min
The reading on all cylinders should be within 25% of each other.
IT is not "what should it be," it is what is the difference between all the cylinders in the engine. You are looking for a bad cylinder in comparison to all of the others. Lets say they are all at 160 except one that is 20 pounds lower, that one should be checked closer to see why. Even 20 lbs is marginal so you might want to use a cylinder leak down test instead of a compression test.
SOURCE: 2008 dodge dakota check engine light
hello. Call around to a few auto parts stores until you find one that offers a free computer scan service. Regards, Joe
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