[W126 Coupe] 380SEC Rev needle reving at its own accord

[Dick Spellman]

Hi Kivendren:

More than likely the problem you describe as 'high rev' is the idle 
control module up on the firewall.  This will fail over a brief period 
of time.  Working sometimes and then failing others eventually resulting 
in a constant high idle.  This would give you a sporadic idle and a high 
idle as you describe it.  This module rebuilt is easily replaced and 
costs aprox. $150 US.

You do not describe a stall as you approach a stop while driving so I do 
not suspect the switch on the control linkage that preserves idle while 
in drive but stopped in traffic.

I do not know if your MB where you are in Africa has the air slider 
valve or not.  If it does I'd check the rubber hoses for tight fitment 
and remove the air slider and give it a cleaning with a bit of carb 
cleaner.   Then test it for operation by applying 12 volts to see if you 
hear the solenoid clicking and see the valve moving where the hoses 
attach.  Test should be only momentary, don't leave 12 volts on there 
for too long.

If you have the MB manual or if you use the on-line service manual, the 
steps for trouble shooting may be of some help.  By the way what year is 
the 380SEC?  There were several model year modifications in the 380 
engine management in the US while it was in production so you likely 
have the same details to sort out when using the manual.

Good luck.

Dick


Kivendren Moodliyar wrote:

> Sometimes the rev Needle revs high even though the engine isnt..Why?
>
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