Sorry if this is an obvious question:

How does one perform a compression test with the engine rotated for service?
Or, more precisely - How do you get the starter motor to turn with engine rotated?

Don't see how you can do it with the engine in position so you could do it warm etc due to plug access.

I've wired the starter motor directly to the battery with the starter and solenoid energised, battery not connected: Result - a few random lights on dash. No response from starter motor.

Your thoughts much appreciated.

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Rules are for the guidance of wise men and the obedience of fools.

Have you disconnected any earths?....

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'98 M2 Razorback, it's a keeper.

Yes he has.

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

Thank you

Turning over now

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Rules are for the guidance of wise men and the obedience of fools.

I don't dare to ask how you do a compression test as per the manual - with a warm engine.

Paul

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Rules are for the guidance of wise men and the obedience of fools.