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Old 02-15-2006, 10:50 PM
Registered User
Join Date: Feb 2006
Posts: 6
1989 420 SEL Stalling update

While driving home my car began to run rough and hesitate as if it wanted to stall. The RPM gage was moving rapidly out of control. I managed to get the car home and it stalled. It will start but stalls after a few minutes. I had it towed to a European repair shop and this is my diagnosis thus far, and the car still stalls.

Crank position module replaced
Ignition control module replaced (That was a fortune.)

I'm at my wits end with this car. Luckily I found a used ignition module. So far the bill total is up to 1160.00.

I will keep everyone updated. I should know more in a few days.

Does anyone know a repair shop or specialist in Southeast Michigan?

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Old 02-16-2006, 03:47 PM
bhatt's Avatar
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Join Date: Apr 2000
Location: Oakville, Ontario, Canada
Posts: 421
Try John & Holger..

You can try a place called "John & Holger".. it's in an eastern suburb of Detroit (can't remember which one.. maybe Hamtramck?)

They're pretty good.

If you are in Detroit and want to make a 4hr trip to Toronto, I can suggest a guy who is GUARANTEED to fix it. He's a former MB tech and *really* knows his stuff. He knows the W126's like the back of his hand... has certainly solved a number of "unsolveable" issues with my cars.

'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi)
'07 GL320 CDI 4MATIC 289,000km (162k mi)
'07 S550 4MATIC 170,000km (105k mi)
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Old 02-19-2006, 04:44 PM
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Join Date: Sep 2005
Location: JAX, FL
Posts: 140
rule out the fuel pump relay

Install temporary jumper between socket pins 7 and 8 of the fuel pump relay and see if you problems disappear. If so its the relay. Remember, while the jumper is installed the car will always be pumping fuel--remove jumper when not in use.
65 190d sold
85 380SE sold
87 560 SL 180K
84 380SE 96K (mint)
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Old 07-23-2007, 02:34 PM
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Join Date: Jul 2007
Location: Ottawa Canada
Posts: 118
So what happened?

Well did they solve the issue... I know I am late in posting this but I have the same issue

1986 420 SEL
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Old 07-23-2007, 06:41 PM
just-n-time's Avatar
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Join Date: Feb 2006
Location: Louisiana266 Maloy Rd winnfield71483
Posts: 804
Mary dose the car just stall or dose it do it when dropping in rpm such as coming to a stop sign?
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Old 08-10-2007, 03:31 PM
Registered User
Join Date: Jul 2007
Location: Ottawa Canada
Posts: 118
I solved it

I solved this problem...
Changed idle air control valve, changed plugs to Bosch Copper Core, all my ignition wires, cap ,rotor, coil and grounding wire... Runs like new. this is a idle air control valve (replace or clean out... including electrical contacts) problem mixed with the fact that original ignition equipment is on the car. Bad ignition causes a cascading effect in the system. Also not that the brittle vacuum hose that runs from the Ignition control Mod located on the driver's fender to the drivers side of the engine (yellowish) can be cracked. Mine was.. Then there is a vacuum hose at the front of the engine that runs down from a black and blue vacuum diaphram near the distibuter that runs down deep inside the block, this heats up and falls off, long pliers will fix this... I think its a yellow and red tube 15cm long. All this will make a difference... Ignition system replacement was the best thing I ever did... only use Bosch copper core. oh get only Bosch equipement, its not GM, this stuff is all top of the line.
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