Replaced spark plugs, ignition coils, now cylinder 4 misfires
I ordered N55 spark plugs & ingition coils from FCP Euro. Disconnected battery, replaced spark plugs & ignition coils with new ones now cylinder 4 misfires (P0304 Cylinder 4 misfire detected). I didn't use any dielectric/grease. I made sure its torqued at 17 lb-ft with a husky torque wrench.
In order to diagnose, I removed the spark plug & ignition coil in 4th cylinder and replaced with cylinder 1. Now 1 misifres. Replaced cylinder 1 with original coil/spark plug. No misfire so far but I hear minor hesitation & very minor occasional shake when idling.
My car is all stock.
What should I do?
N55 2011 135i
Last edited by taranfx; 01-11-2018 at 03:18 AM..
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