[W126 Coupe] Stalling issue

[Axel Wulff]

Well, it could be a number of things, such as the EZL (ignition control module), the ECU, the fuel distributor or the fuel metering plate, among other things.

 

The fact that it only hesitate/stumble when hot may indicate that the EHA is malfunctioning.


How many miles on the engine? What is the age/condition of spark plugs, caps, cables, distributor, coils?


Axel Wulff
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> Date: Sun, 27 Sep 2009 15:18:34 -0700

> From: rltimmerma at cox.net

> To: mbcoupes at mbcoupes.com

> Subject: [W126 Coupe] Stalling issue

> 

> I need some help with a stalling problem. My 1990 560 SEC has taken to dying on rapid acceleration.

> 

> If I try to accelerate sharply from idle the engine quits. It always starts right back with no problem and idles perfectly. If I accelerate gently it also has no problem including WOT acceleration from moderate speeds. I found while checking this morning that the problem doesn't happen until the engine warms up. (accelerates as it should when engine temp is cold.)

> 

> I checked the fuel pump pressure by disconnecting the supply line to the fuel distributor, installed a 0-100 psi gage and jumped fuel pump relay terminals 7 and 8. fuel pressure is over 100psi (it pegged the gage) I don't have the metric fittings to check the lower chamber pressure or test while the engine is running.

> 

> Am I correct in thinking this is a fuel supply problem? Is there some electronic enrichment on rapid acceleration?

> 

> Any help is much appreciated.

> 

> Ray Timmerman

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