Misfire and clutch

Naser Naser · 2019-10-15T08:57:17+00:00

Clean car listed above with the M54 engine. misfires on cylinder one. thinking it could be the coil since they are notorious for it. switched cold around, nothing.bought a new coil, still.the misfire goes away and check engine light goes off while driving randomly and the car drives perfectly. Compression is around 130, thought maybe the ring is a bit sticky, so added some Rislone compression repair and started driving it, the check engine light went away sometimes, and that is only after i added this stuff. so hopefully it is helping. but i want to test the wire going to the coil. is there a way to do that? what else could it be? Another issue with it is that the car while idling and parked has a similar to a knocking sound from the clutch, but when i press the pedal that goes away and the engine misfires decreases a lot...

2004 BMW 525I

72,000 MILES • 6 CYL • 2WD • MANUAL

JACOBANDNICKOLAS

✓Experienced Mechanic
110,240 POSTS

You know, when you depress it, you place lateral pressure on the crank. I wonder if there is excessive end play in the crank? Worn thrust bearing on the crank aren't uncommon with a manual transmission.

Just a thought.

Joe

Nov 3, 2019 at 12:59 PM

NASER NASER

MEMBER
836 POSTS

Not sure, 72,000 on the car, harmonic balancer doesn't wobble or play.

Nov 3, 2019 at 7:37 PM

JACOBANDNICKOLAS

✓Experienced Mechanic
110,240 POSTS

Okay. If there was excessive end play, then it would make sense. Since it has low mileage, there is even a lower chance of that as a problem unless it wasn't serviced properly.

Joe

Nov 4, 2019 at 12:17 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.