HELP! Engine RPMs and Power Dips/Stutters | 545i
#1
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My Ride: ///M5 BEAST
Model Year: 2006
hey everyone, i am having some issues with my engine performance. while driving (never at idle) i have intermittent power loss. the engine RPMs dip down by about 3 or 4 hundred, the lights on the dashboard dim a little bit. it only happens for about one second then it goes back to normal. however it happens in spurts. there will be like 5 to 10 power dips/lights dimming in a row....then nothing.
overall performance is still the same. i can floor the throttle from a red light and the car shoots off like a missile. i only notice the problem when cruising along at regular speeds or highway speeds.
my car has the following specs (im not sure if it will help diagnose the problem):
please help!
overall performance is still the same. i can floor the throttle from a red light and the car shoots off like a missile. i only notice the problem when cruising along at regular speeds or highway speeds.
my car has the following specs (im not sure if it will help diagnose the problem):
- 2004 545i w/ 51k miles
- Dinan Stage 3 software
- Dinan dual cold air intake (RPI scoops)
- Supersprint Exhaust
- i have been running 87 octane here and there but the last two full tanks were 93 octane
please help!
#2
I would say a bad vacuum hose or coil can reduce engine performance no? But I would get that alternator and battery tested it could be sudden dips or spikes in power. Just throwing stuff out there, maybe someone with more knowledge can chime in
#4
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My Ride: 05 545/6
although I'd investigate the check engine light, the only thing that would cause the lights to dim is the alternator. a Bad O2 sensor wouldn't do that, nor would a bad coil (you'd have some rough running all the time if that were the case) and a vacuum hose leak wouldn't affect the lights either. your battery could be shorting out, too.
#5
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My Ride: 545I and a half dozen other rides
I'm wondering if it is gas, I got a bad load and it acted exactly like you did and after putting a bottle of techron in and running three good tanks of chevron it is slowly getting better.
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