Do these symptoms go with a bad injector?

Tronner · 12-06-2011, 05:03 PM

So I’m noticing a few things that are making me wonder if I might have a faulty fuel injector that could be causing some other problems I am having.

1. Erratic / slight stumble at idle – even with brand new spark plugs
2. Engine feels a little sluggish and doesn’t rev as freely as normal on any map
3. Feel of slight vibration / weakness under load
4. Fuel mixture control codes thrown - 10720 and 10721
5. After the car sits for about 30-40 minutes there is definitely a noticeable fuel smell when I go to get in the car. Not after it sits all day (the fuel would have evaporated by then right?) and not if I drive it within 5-10 minutes or so
6. Slightly longer cranks happening at startup
7. 11566 Angle of throttle valve- intake pipe underpressure, correlation code (one time)

Would any / all / some of these things make sense if an injector were leaking / faulty? If so, is there a way to tell with the engine cover off, or a way to tell with a BT cable?

FastBimmerN54 · 12-06-2011, 05:19 PM

Definitely plausible. Were your injectors replaced under warranty/recall?

Tronner · 12-06-2011, 05:55 PM

Yes, I believe they replaced at least 2 injectors when they did the HPFP recall as well.

12-06-2011, 05:03 PM	#1
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	Do these symptoms go with a bad injector? So I’m noticing a few things that are making me wonder if I might have a faulty fuel injector that could be causing some other problems I am having. 1. Erratic / slight stumble at idle – even with brand new spark plugs 2. Engine feels a little sluggish and doesn’t rev as freely as normal on any map 3. Feel of slight vibration / weakness under load 4. Fuel mixture control codes thrown - 10720 and 10721 5. After the car sits for about 30-40 minutes there is definitely a noticeable fuel smell when I go to get in the car. Not after it sits all day (the fuel would have evaporated by then right?) and not if I drive it within 5-10 minutes or so 6. Slightly longer cranks happening at startup 7. 11566 Angle of throttle valve- intake pipe underpressure, correlation code (one time) Would any / all / some of these things make sense if an injector were leaking / faulty? If so, is there a way to tell with the engine cover off, or a way to tell with a BT cable?
	Appreciate 0 Tweet Quote

12-06-2011, 05:19 PM	#2
FastBimmerN54 Banned 10 Rep 375 Posts Drives: Seats and a Steering Wheel Join Date: Jul 2011 Location: Around iTrader: (1)	Definitely plausible. Were your injectors replaced under warranty/recall?
	Appreciate 0 Quote

12-06-2011, 05:55 PM	#3
Tronner Second Lieutenant 76 Rep 291 Posts Drives: 2018 X3 M40i Join Date: Sep 2010 Location: Edwards, CO iTrader: (2)	Yes, I believe they replaced at least 2 injectors when they did the HPFP recall as well.
	Appreciate 0 Quote