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Question DetailsAsked on 1/13/2014

Is a compression test done at the same time as a fuel injection cleaning?

I'm taking care of some cars and am learning what to ask. When I took the Maxima to a repair shop I forgot to ask when do they do a compression test? Is it done on a regular basis? Is it a routine part of some other maintenance procedure? How often should it be done?

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2 Answers


A compression test is not done as part of a normal maintenance schedule.

A compression test is used to determine the condition of the internal engine components (valve train, cylinder walls, piston rings, etc.) and most often the result of a diagnostic suite of tests to determine the nature of failure in a poorly running car and/or if the engine is worthy or repair.

Some compression tests are done as part of a comprehensive analysis prior to sale but it is not part of any regular scheduled maintenance schedule that I have ever seen.

Answered 6 years ago by WoWHomeSolutions


As WowHomeSolutions said, not a normal part of maintenance for cars and light trucks - usually only done if a problem is suspected, a cylinder is sooting or oiling up the plug, or one cylinder shows consistent misfires on the computer and the probloem is not spark plug or injector.

Compression tests are a regular part of the testing for large diesels like for buses and over the road trucks, but they also run at a much higher compression ratio, the combustion depends on the compression rather than a spark plug, and they commonly go 300-500,000 miles before a major overhaul as opposed to the 100-150,000 or so for a normal car.

Answered 6 years ago by LCD

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