[W124] Re: It can't idle

[acordova at texas.net]

My memory may be hazy, but isn't it either the fuel pump relay or the 
overvoltage protection relay that can cause this hunting idle?

You listed the overload relay. That's probably what I called the overvoltage 
protection relay. I think it's a relay that includes a fuse at the top. Did 
you or your mechanic actually replace that fuse? (80A?)

Good luck, and I also can't think of a better ride for the money.

Alec Cordova
Taylor, Texas
89 300CE, 211K


Quoting Sam Ho <samhoming at yahoo.com>:

> Hi All,
> 
> My 1990 300CE-24V has develop a low idle that has been bugging me for
> sometime. My mechanic tried everything and came up zilch.
> 
> Defect: Car has problem starting. Needs more than one attempt anytime it
> has been switched off more than 5 minutes. Once started it seems to go to
> 1500rpm then drop to less than 500rpm and yoyos a few times before settling
> to a hi-idle of about 1000rpm. Load aicon and it drops to 800rpm. Put in
> gear and it drops and comes back to 800rpm. So far so good.
> Drive for 5 minutes. Stop (like at the traffic lights) and the idle gets
> rough indicating below 500rpm, sometimes as low as 200rpm. Drive off is
> okay. Once the car gets going, it still drives well. Acceleration and
> cruise is fine. 
> It just can't idle smoothly!
> 
> Tried/checked: airflow meter (the whole body), idle contol valve, fuel flow
> regulator, with and without air filter, ECU, Overload relay, fuel
> distributor, fuel injectors, engine mounts, vacuum hoses & wiring checked.
> Replaced fuel filter, both fuel pumps, fuel accumulator, ignition cable,
> spark plugs, rotor arm, distributor cap. 
> My mechanic now thinks it's the EZL control unit. The problem is it's not
> stock locally in Malaysia and has to be ordered at a high price. Before I
> do that can any of you point me in the right direction please.
> 
> Thank you,
> Sam
> Kuala Lumpur, Malaysia.
> Still can't find a better car to drive for the money!