This is topic Misfire in forum Tech Talk at Northern California Ford Owners .
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Posted by Boosted_DropTop (Member # 10728) on
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I changed my spark plugs and oil on Sunday and after I turned it on I developed a misfire on cylinders 5 & 6. It's a 97 cobra. Plugs are tr6 gapped at 28 like I always gap them too. I changed wire to different cylinders misfire didn't change, I swapped spark plugs to different cylinders still the same, I put old plugs back in no change, I swapped coil packs still the same 5 & 6. I checked for injectors for pulsation with a stethoscope I could hear them. Only thing I can think off is maybe I lost compression on those to cylinders. I have no check engine light. Car ran great before oil and spark plug change
Posted by kuku93 (Member # 14014) on
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How's the oil pressure
Posted by Boosted_DropTop (Member # 10728) on
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On my factory gauge between the A and L on normal, I don't have an aftermarket gauge to see actual psi.
Posted by NK2186 (Member # 12319) on
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check and make sure the spark plugs are tight, also make sure oil is not filling in the plug wells on those cylinders. if not ignition related you may have a bad headgasket since its two cylinders next to each other.
Posted by Autumnstang97 (Member # 6111) on
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Did you ever diagnose and solve your issue on the Cobra?
Posted by Boosted_DropTop (Member # 10728) on
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Yes i had knocked out a vacuum hose by accident was only touching the nipple but not fully inserted
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