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E34 (1989 - 1995)

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  #1  
Old 02-13-2014, 06:49 AM
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Doktor Bert Doktor Bert is offline
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Intermittent Idle Misfire - Injektor???

Past couple of days I have picked up an idle misfire at stop signs that will go away when you pick the RPM's up to about 1700. This will happen after an hour or so of freeway driving, but only at idle, which leads me to suspect a fuel injector. However, I have no codes present to indicate any type of recognizable fault.

Think I'm on the right track???
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  #2  
Old 02-13-2014, 07:08 PM
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Hmmmm...coil perhaps, but no CEL...
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  #3  
Old 02-13-2014, 07:32 PM
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E34ZombieHunter E34ZombieHunter is offline
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It is OBDI, and can't catch everything even OBDII can miss stuff, my M60 does the same every once in a while, has a slight miss usually after a heat soak like riding it hard.
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  #4  
Old 02-13-2014, 07:37 PM
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I must solve this riddle...I'm OCD you know!!!!
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  #5  
Old 02-13-2014, 07:50 PM
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E34ZombieHunter E34ZombieHunter is offline
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When i smoked my side markers i got some fish eye in one light from not being cleaned enough. I soaked all in gas to remove the paint and re painted them all to make sure it matched.
I have tried to help my miss, but many parts later nothing changed, hope you find the issue, and maybe i can apply it to my M60.
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  #6  
Old 02-13-2014, 11:59 PM
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There's no provisions for injector specific issues in Bosch Motronic, or any OBD I for that matter.

With OBD II and CAN Bus, you can see a bad coil or at least an upstream electrical component through the ECU, but still cannot detect a mechanical problem out on the nozzle without physically pulling the injector and bench testing it.

Oddly enough, CAN Bus treats the injector coil as a sensor, but can't specifically detect if it's getting to point of being too plugged.

I've seen partially clogged Delphi injectors pulling full trim, yet as long as Lambda was satisfied, so was mother brain. No DTC. Meanwhile, the car had a loping idle and returned 6 MPG average less than normal.

Prudence would dictate that if an engine has driven over 90K miles, the injectors will require an off-car cleaning to be returned to spec....code or no code. Doing so also provides a good opportunity to scope out the intake valves, replace the fuel filter, and change out any questionable fuel lines.

Worth looking into IMO.
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  #7  
Old 02-14-2014, 05:32 AM
Mamij Mamij is offline
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I had pretty much the same issue a while back. Missing when hot. Turned out to be a bad coil. ****ty thing was my coils were new OEM and just 1 year old.

If you have no coil code (and you could get all kinds of codes I got the cam sensor) you need to sub a good coil(s) in and trial and error till you find the bad one.
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  #8  
Old 02-14-2014, 09:01 AM
rainman0833 rainman0833 is offline
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I had the same problem. It was a bad coil.
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