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Old 11-01-2012, 04:21 AM
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idjit idjit is offline
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Location: Fredericton area, New Brunswick, Canada
Join Date: Feb 2012
Posts: 147
Mein Auto: 2003 525i
Well I finally had a decent day to swap injector 3 and 4 allong with the O-rings. BTW all 12 O rings looked great.

Still throwing cylinder 3 misfire with fuel cut off.

To date...

The spark plugs have been replaced since last year and I swapped the number 3 coil with number 1. Also a new DISA unit this summer and there are no vacumm leaks. (Thorough smoke testing was done as hoses ccv, etc were all replaced last January.) ICV valve cleaned. Unplugged Vanos intake solenoid to rule out vanos. A can of injector cleaner, a can of seafoam. Injectors swapped.

Is there a cold start injector in this engine? Would it feed primarily into Cylinder 3? I'll have another look at the spark plug chamber before moving on to a compression check.

Always starts smooth then goes rough and then rougher as the idle drops then smooths out again about when the needle comes out of the blue.

Thanks -Bob
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