Quote:
Originally Posted by Jamiewelch
You can't check compression on a T4. You can check injector compensation and cylinder balancing, but not compression. Just because the car isn't compensating on a cylinder doesn't mean that it is ok. It just means it isn't aware of an issue.
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It might not be as accurate as using a gauge but you can. The engine turns over with the injectors not firing and T4 checks how the crankshaft speed slows as each cylinder comes up on compression.