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E21, E30 General discussion and technical help for 1975-1991 3 series cars.

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Unread 03-13-2007, 02:02 AM   #1

Name: chhigo
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Exclamation Vibration when release the accelarator padel

Dear Friend

I have a BMW E30,316i 1989 M40 engine car. When release the accelarator, engine RPM going to 650-700 and badly vibrates the car. After vibrates, engine going back to normal RPM(800-850) and runs smoothly. This is happening alway when release the accelerator padel. This problem bit verse when A/Condition is on. Please give me some tips/solution to resolve this matter.

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Unread 03-13-2007, 07:51 PM   #2
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Well I'm not an expert but since no one else has responded I figured I'd at least give the thread a bump.

It can be almost anything from the fuel and air filters, to bad spark plugs, or valves needing adjustment. Check what maintenance has been done recently. I personally don't have any experience with the 316i so I don't know any of it's quirks. Also is the engine rpm dropping past normal rpm down to 650-700? And does it only vibrate when it reaches 650 or does it vibrate all the way back to normal rpm?

Also I believe your bmw has an onboard diagnostic system that you can use. This link should explain it for you. http://www.pelicanparts.com/BMW/tech...nostics%20.htm.
This might help narrow it down.

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Last edited by Exilion; 03-13-2007 at 07:55 PM..
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Unread 03-13-2007, 11:35 PM   #3
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not sure, but you may want to check the vacuum lines.

also fuel filter as stated above. I know my M42 needs 91 octane, make sure you are running premium gas, i know mine vibrates and knocks with crappy gas.

also check your O2 sensor.
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