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Cyl #7 dead miss

Changed coil and spark plug and injector. Checked for power and ground to each using noid light and ok. Compression=155lb. Removed valve cover and valve spring and lift ok. Any suggestions?

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  • Cars & Trucks Master
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Do a running compression test. What you are experiencing IS mechanical. I would suspect a lifter collapsing at higher/faster rpm and you will not see it with the valvecover off.I have seen this numerous times and a running compression test will let you know

Posted on Apr 25, 2015

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Posted on Jan 02, 2017

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Sounds like #2 is still missing. Misfires can be caused by an ignition problem, a fuel problem, or a mechanical problem where there is no compression in the cylinder.
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If still no help, have the compression checked in #2. Low compression from a valve problem or head gasket problem can cause misfires.
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