Anyone ever have a stuck (closed) injector??? (archive)

I had a misfiring problem on cyl #2 on my M5. I removed the plugs, cleaned them all, checked gap, checked cap/rotor, reassembled. I also tapped each injector firmly before firing it up again. Car ran fine after that. Same thing again 2 days later, but it magically cleared up after driving 2 minutes. Then it happened again, but never cleared up. So I replaced the plugs. No difference. WTF??

I removed the plugs again last night (less than 5 mins run-time on brand-new Bosch X5DC), and I noticed there was no gas smell on #2. Weird! Has anyone else ever had a stuck injector?

So I removed the injector harness, clicked the injector a bunch of times with 12VDC from the battery, sounded fine. cranked the engine to check for voltage at the wire harness, saw 3VAC (due to the switched nature of the injectors) at #1 and #2, so I assumed the wires were OK. Plugged everything back up, car runs great now. What happened? Why did the injector stick shut? It appears that I'm the first person to ever open the injector wiring loom, and there is no damage, burnt wire, or anything out of the ordinary.

Anyone seen this before? Should I get my injectors cleaned or replace them? Car has 132k miles, and I run 94 octane Sunoco almost exclusively.

Thanks
James
james_535@yahoo.com
88 M5
88 M3

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