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Old 09-11-2002, 02:51 AM
Mervyn's Avatar
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Join Date: Jan 2001
Location: Singapore
Posts: 268
Difficult Wam Starts - Warm up Regulator?

I've gone thru all posts on the "warm up regulator" but somehow I still need someone to address my problem.

Mine is a Euro 1983 W126 (280SEL) - M110 engine. I've been having difficult warm starts lately. Takes a couple of seconds of cranking and flooring the accelrator to get the car starting. My mechanic suggested the problem to be the warm up regulator, but before I spend that $$ on it, I thought I'd better check it in this forum first. The regulator is not cheap.

Another symtom which I thought could be attributed to the regulator is that the car, when started, goes to very high RPM for about 30 secs to a minute, before finally dropping to normal idle speed. The same happens when I shift from "D" to "P", even when after driving for some time.

Could anyone tell me what is really at fault? I've checked and my car does not have the infamous OVP relay, so I've ruled that out.

I've got new Idle control valve, cap and rotors, plugs, fuel filter etc........or could the cause be the fuel pressure regulator?

Any advice is appreciated, thanks!
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1979 W123 (200/M) Midnight Blue
1983 W126 (280SEL) Dupont Deep Black (Previously Pristine Silver)
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