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Miscellaneous Automotive
Car Performance & Repair
Coil voltage problem.
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<blockquote data-quote="Bradmph" data-source="post: 8760375" data-attributes="member: 683833"><p>I would guess possibly a vacuum leak, you can spray fluid around areas that may be leaking and see if it raises rpm or idle as you spray.</p><p>Check your distributor cap for carbon build-up on that one cylinder's electrode. You said when you rev it, that it comes up and matches the other 7 at higher rpms. </p><p>Does the spark plug electrode show any signs of heat or carbon built up, compared to others? I would do a compression test on that cylinder for sure and compare to the others. Could have a sticking valve at low rpms or a bad spring. The ceramic on the plug for that cylinder is intact? Sometimes a crack can be hidden until it gets some dirt in it. </p><p>Trying to think of all the reasons that could cause this.</p></blockquote><p></p>
[QUOTE="Bradmph, post: 8760375, member: 683833"] I would guess possibly a vacuum leak, you can spray fluid around areas that may be leaking and see if it raises rpm or idle as you spray. Check your distributor cap for carbon build-up on that one cylinder's electrode. You said when you rev it, that it comes up and matches the other 7 at higher rpms. Does the spark plug electrode show any signs of heat or carbon built up, compared to others? I would do a compression test on that cylinder for sure and compare to the others. Could have a sticking valve at low rpms or a bad spring. The ceramic on the plug for that cylinder is intact? Sometimes a crack can be hidden until it gets some dirt in it. Trying to think of all the reasons that could cause this. [/QUOTE]
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Coil voltage problem.
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