1996 Mercedes-Benz E200 Unstable RPM

MERCEDES BENZ
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SNOWMAN_ON
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  • 2 POSTS
I need some technical help regarding my car (mercedes E200 model 1996)
the problem is :the rpm is not stable "going up and down between 600 and 800";my mechanic tested the car using a pc computer and said there is no any faults with my car.
:oops:
Aug 10, 2006 at 8:07 AM
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2CARPRO JACK
  • ✓Experienced Mechanic
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Check for vacuum leaks, especially the rubber intake boot from air cleaner to the throttle bore. Also remove the intake boot and clean out the throttle bore around the butterfly
Nov 16, 2006 at 2:43 AM
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SNOWMAN_ON
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Thanks to all
the problem solved
the rpm was not stable because the ac of my car for "i dont know reason" was sending a rabid on/off signal to the computer which caused him to force the rpm up and down in simutlaneity.
Nov 30, 2006 at 12:19 AM
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Suggested Repair

The idle fluctuation was traced to the A/C system rapidly switching on and off and signaling the computer to raise and lower rpm. Also check for vacuum leaks at the intake boot and clean the throttle bore around the butterfly.

Conversation Summary

A 1996 Mercedes-Benz E200 had unstable idle, fluctuating between 600 and 800 rpm, with no faults found on a computer scan. An expert advised checking for vacuum leaks, especially the intake boot, and cleaning the throttle bore. The owner later reported the problem was solved: the A/C was sending a rapid on/off signal that made the computer vary engine speed.

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