Hello, once again.

I hope the soap-opera intrigue of this thread finds you
in good health and spirits, today.

I have decided that, next (after I install all my new RENNTech cooling modifications), I will replace my:

- fuel pump relay
- power steering pump

"Let all be made aware: my labors of love continue!"

; )

Hello, once again.

I hope the soap-opera intrigue of this thread finds you
in good health and spirits, today.

I have decided that, next (after I install all my new RENNTech cooling modifications), I will replace my:

- fuel pump relay
- power steering pump

"Let all be made aware: my labors of love continue!"

; )

I believe I will try a new experiment:

I would like to install a solenoid to regulate the
throttle-plate, under load, such that when I am (U-)turning, it fools the vehicle's electronics.

In so doing, perhaps my fuel/air mixture will not be so lean and - possibly - my stalling problem may be averted.

Anyone...? Anyone...?

("Voodoo electronics")

Scott,

Have your mechanics ever made a reference to a Brake Switch being the offender? (See the 1st response to your thread on page 1.)

Ross:

No codes appear in my computer; moreover, this evening, I verified that my idle speed is OK (about 750-800, in "D").

I will replace my idle bearing in a few weeks, since it sounds a little shot (rough, slight grinding sound). Then, when my checkbook regains its balance, I'll launch into the assault on this problem, again.

Thank you for your reminder; however, believe me when I say that I revisit this thread very often to make sure I have not overlooked any detail/possibility/variable/clue.

Kind regards,

Scott,

last post I knew of, your idle was 500 rpm. How did it get to 800 rpm?

"Curious minds want to know"!

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Jim:

Yesterday afternoon, I had yet another tech measure my idle speed with a hand-held computer; he showed me the readout, which was nearly 800 RPM.

Suspension of disbelief aside, I must (by the law of averages) assume my idle speed is above 600 RPM.

Perhaps I have been barking up the wrong tree: now, I believe my problem to be related to my throttle body (fuel/air micture = too lean versus too rich).

Sincerely,

Are you saying that your tach indicates 500 rpm but it measures 800 rpm on a computer?

800 rpm is very high for idle. I would suspect that when idling with the car in "D", it would want to 'creep' (maybe even jump) forward, requiring a firm brake pedal.



[Edited by JimF on 05-18-2001 at 09:59 AM]

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page

Yes, the (nearly) 800 RPM reading was, indeed, in "D" - I'm just posting that which my tech conveyed to me. I saw the hand-held computer readout with my own eyes...

Hmmm...

Does it not make you suspicious that there is a discrepancy between the two readings? Perhaps that points to the problem? Seems hard to believe the tach on the dash could be that far off....

here's another idea.

Scott, I was actually rereading your post from the beginning and it struck me that you have the traction control defeat switch installed in your car. This is an electronic mod that was not stock.... have you inspected the switch mount and all wiring related to this mod? When we swapped modules a while back, i noticed
some of the wires under your computer housing had been unbundled, whereas they were neat in my car. Is it not possible the SRS defeat switch was spliced into some of that?

Any updates on your issue run.exe?

All:

My 500E still stalls (alas) under the same conditions; I will look into Eric H.'s suggestion, soon.

On 24AUG01, I will replace my idle bearing. At that time, I will have my tech (Steve Smith) investigate.

Kind regards,

Scott, I was reading through the whole thread and noticed that several items seem outstanding (or at least you did not post results thereby giving the impression that they are still outstanding...)

1) E-gas replacement with the recommended version. Have you been able to locate a proper one? Last you spoke of it you mentioned that you did replace it but with a module not of the recommended version.

2) JimF mentioned adjusting the idle through the accelerator linkage adjustment. Although you did mention that the HHT's reading of your actual RMP is at 800 vs intrument cluster tach readout of slightly below 500. This leads to the next question...

3) Have you been able to account for the disparity in readings (tach vs. HHT), as EricH mentioned?

My take: From the initial symptoms you posted, it seems that the engine stalls when additional stress/strain is placed on it at low idle (use of power steering on slow turns, inclines) Both situations seem to increase load on an engine which may lead to stalling on an already low idling engine. At idle, does it shutdown as well when, say, the a/c compressor kicks in? This, like the two symptoms you mentioned, would also tend to decrease rpms, ceteris paribus, and hence may cause the engine to shutdown as well.

[Edited by rainmaker on 07-22-2001 at 02:26 AM]

__________________
Rainmaker
93 500E, 43k mi, Pics of upgrade parts
Evo II Wheels on Dunlop FM901 235/45x17s
94 Facelift
RennTech CF Airbox
RennTech ASR Defeat
RennTech Chip
1st Gear Start
97 Range Rover 4.6 HSE Vitesse, Yellow, "Tonka" (sold)

Boy, what a nightmare of service woes! I checked out the pictures of your car sometime back and it's really amazing. Sorry it's not treating you right. Still at it after 5 months or so?

I too just read the whole thread. It's not a waste of time learning about the quirks of these cars, believe me!

The only thing I can add after sleeping on it is: Have you removed the ASR defeat switch from the circuitry? Considering the way ASR operates, if there was any malfunction in the ASR wiring, I wonder if that could initiate your symptoms?

I think, if you are still fighting this problem, that a summary update is needed now. You've tried so many things that I'm losing track! Can you post a summary?

BTW, my late-'92 500E idles at an indicated 500rpm, in drive and warm. It's a little lumpy at idle when hot, but it pulls cleanly and never starves or stalls (at least since I bought it in March). I wouldn't get off track with added electronics, until you've found the cause.

__________________
Mark Stetson
1995 E320 Wagon Moonstone Grey/Parchment 106K mi.
2007 E63 AMG Graphite/designo 75K mi

Scott,

With the few minutes that I have, I re-read all the posts, only to find that the Ignition Control Module (ICM) saga was lost somewhere. Did you manage to swap your ICM for a good one?

I was experiencing the same problems as you, stalls when coming to a stop or when slowing to make a turn etc. After spending some money on other parts and many sleepless nights on the evasive problem, it turned out that the ICM was due for replacement. Like I mentioned in the earlier post, all it took was a friend's working-condition ICM (borrowed for a few days) to convince me that the problem is gone. There!

Perhaps you could really consider replacing your ICM.

Mervyn
1983 W126 (280SEL)