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compression test

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Old 05-03-2009, 09:04 AM
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Can someone tell me which relay or fuse to disable so i can crank the engine over with out it starting. I want to test compression in a cylinder.

I have one cylinder that the threads on the spark plug are oily. I think its causing a misfire at idle. The plug doesn't really look fouled though just oily threads. Its number 8. I also notice the engine has a funny knocking noise when it misfires at an idle but only if its in gear. If i give it any throttle the knock goes away??? odd huh?
Old 05-03-2009, 09:17 AM
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Pull the fuel pump fuse under the hood. I also pull the ign fuse but Im ****.
Old 05-03-2009, 09:18 AM
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Thanks...i think the knock i hear is the cylinder unloaded when the plug misfires.
Old 07-08-2009, 11:00 AM
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Pulling both injectors fuses disables everything you need to do a comp test.
Old 07-08-2009, 11:49 AM
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Pulling all of your plugs out makes it easier on your starter and give more consistent results.




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