Originally Posted by vasillalov
What I'd like to know is this:
OEM specifications for electrical resistance of the coils. One could easily do a home test with a mid-range volt meter.
hotrod posted a thread on this a few weeks back. He checked his used coils versus new ones. I don't think they solved his misfire, but he did solve it in that thread.
Resistance doesn't tell us enough about the behaviour of the coil under load. It's useful to check, but probably isn't the end-all of the coil diagnosis.
I agree on not throwing parts at a problem - wastes time and money. But you can easily sell the set to anyone here on the forums. Any track or drag race enthusiast should have a spare set whenever they go to a track event.
E92 335i/6MT Dinan Stage 3: intercooler, oil cooler, intake, flash, exhaust, LW dual-mass flywheel.
Vishnu PWM methanol custom trunk mount, Diffsonline 3-clutch Salisbury custom diff, Ohlins Road and Track coilovers, Vorshlag camber plates, much more...
E28 M5 w/ buncha stuff, R171 SLK350