Can't figure out this misfire

[NickL]

Fixed. Vanos Solenoid.

[sublimation]

Misfire at idle or when revving up / under load?

[ian e30 318is]

Maybe try different plugs. What are you currently using? I switched to NGK and my idle improved and made a slight hesitation disappear.

[Sea Aych]

Does it miss consistently now or does it happen intermittently?

[M3PO]

I had a slight misfire at idle on Bosch coppers and NGK plugs cured that for me too. I had a misfire at WOT above 4000 rpm that was caused by a cracked coil boot.

[ky0u]

I had a slight misfire at idle on Bosch coppers and NGK plugs cured that for me too. I had a misfire at WOT above 4000 rpm that was caused by a cracked coil boot.

Had the same issue. Misfiring when spark breached the insulation and arched

[5Toes]

it might be an intermittent crank sensor, coil packs likely are good if you can change the idle with each one. maybe try rebuilding your injectors for good measure - mepeh here on the forum can do it for $45 or so total.

[M3PO]

it might be an intermittent crank sensor, coil packs likely are good if you can change the idle with each one. maybe try rebuilding your injectors for good measure - mepeh here on the forum can do it for $45 or so total.

Mine would change the idle because they were firing. But at high RPM the car would misfire horribly and break up. The damage to the coil boot seemed really minor but it was enough to cause a major problem.