E30 Club SA: E30 318I Auto - E30 Club SA

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E30 318I Auto Vibrating Idle in neutral

#1 User is offline   Sammy_CPT Icon

  • Mercedes-Benz
  • Group: Members
  • Posts: 3
  • Joined: 18-September 17
  • Gender:Male
  • Location:Cape Town
  • My e30:318i
  • From: Western Cape

Posted 04 October 2017 - 09:17 AM

Hi guys,

I have a 1991 E30 318i Automatic.

The problem:
The whole car vibrates when idling in neutral when in normal operating temperature.
Power delivery is smooth when driving with no flat spots, so its just the idling that rattles the car.

• The brake system was reconned by previous owner but but takes quite low down to stop the car
• I've cleaned out and dried the oxygen sensor with spark cleaner
• Cleaned out and dried the throttle butterfly and the pipe between filter box and intake with carb cleaner
• Cleaned out and dried the idle control valve
• There is an issue with the radiator leaking transmission fluid (that feeds the gearbox) but thats being replaced now.
• I replaced the spark plugs with BMW specced ones
• The vac hoses all seem fine

My mechanic told me that the automatic e30 318i's never have a completely smooth idle but I'm reluctant believe this.
Can anyone please shed some light on how to further solve this issue?

Much thanks in advance!
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#2 User is offline   Jeremy.D Icon

  • 325i
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  • Gender:Male
  • My e30:'92 316i
  • From: Kwa-Zulu Natal

Posted 06 October 2017 - 12:55 PM

Airflow meter maybe?
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#3 User is offline   Sammy_CPT Icon

  • Mercedes-Benz
  • Group: Members
  • Posts: 3
  • Joined: 18-September 17
  • Gender:Male
  • Location:Cape Town
  • My e30:318i
  • From: Western Cape

Posted 06 October 2017 - 02:35 PM

View PostJeremy.D, on 06 October 2017 - 12:55 PM, said:

Airflow meter maybe?

I cleaned the air flow meter with Spark Cleaner already. Didn't make any difference.
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