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rough running at low rpm and low throttle rough running at low rpm and low throttle
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E34 M5 Discussion 1988-1995 Sedan and Touring


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Old 25th November 2007, 14:32   #1
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rough running at low rpm and low throttle
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rough running at low throttle
Hello,i live in France and own a 12/92 M5 touring since 9 years.At low rpm and low throttle,when i just want to keep the same speed without to push the pedal to the metal i feel hesitations and rough running.I changed spark plugs,6 coils,camshaft sensor,air sensor and nothing better...If you find what happen to my baby it would be great to let me know.Take care.Best regards,Stephane.
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Old 25th November 2007, 16:04   #2
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Have you checked for leaks in the intake rubber boot between the AFM and the intake manifold?
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Old 25th November 2007, 16:56   #3
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Injectors may be another area requiring inspection also .
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Old 25th November 2007, 22:34   #4
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Lamda sensor too if it's never been changed....
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Old 25th November 2007, 23:54   #5
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Don't know if its applicable...but....my 535i was exhibiting the same symptoms and it turned out to be the crankshaft position/speed sensor.

Hope this helps.

Erik
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Old 26th November 2007, 09:09   #6
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Thanks for your help everybody and let's go for checking....I'll let you know.Best regards.
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Old 14th July 2009, 11:47   #7
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Since my last post i changed the lambda add to the long list an i checked for air leaks: nothing better. I'm really tired with this problem....any help?
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Old 15th July 2009, 21:40   #8
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Check the earth strap to the body from the engine and alos check the loom which comes from the ECU to the coil packs where it goes under the coil pack cover as these gave me a similar problem with hesitance. upon full throttle there was little or no hesitating
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Old 16th July 2009, 11:01   #9
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Hello Steve Mac,
thanks for this info,i will check those too points too....
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Old 16th July 2009, 22:03   #10
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Hi, i had a problem with mine years ago where it would not maintain a low speed smoothly. It turned out to be the idle control valve, you can start off by metering it at the intermediate plug on the top of the engine. I think its supposed to be; 40 ohms between pins 1 and 3, 20 ohms between 1 and 2 or 2 and 3. Mine was only half this and the problem was driving me mad!

MIKE.
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