PeachParts Mercedes-Benz Forum - 190e stalling on steep slope (forward only)

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190e stalling on steep slope (forward only)

This is my 3rd post here regarding this problem.
Replaced ICV,OVP and Fuel Pump Relay and also checked speed sensor and all wirings as suggested by Steve and Jackd.
My 190e still stalls when slowing down on a forward slope.
I let the car glide down the slope on Neutrel to see if it was the tranny that is causing this problem, but the engine still cuts off when the car is gliding down a steep slope when the brake is applied.
It is like something is going wrong in the car or not working properly when the car is tilt forward when applying the brake - on rush pressure problem ??? battery???.
Will fuel pump and filter contribute to this problem?
Please help as mechanics here ain't that familiar with W201 engines.

I don't know if this will help but I posted it some time ago:

Quote:

It is amazing how these symptoms get translated into incredibly expen$ive parts/service replacment journeys.

My favorite is the woman who complained about not being able to drive her new car fully up her fairly long driveway. She said it always stop by "the tree". Always. Not at her friend's house, not going up into the hills, not going down hills, not anywhere but her house. No one believed her. She was outraged, frustrated and horrified that no one could fix it, let alone believe her.

The car was in the shop regularly for many weeks. There was a large bonus from the dealership and from the factory for the one who could figure it out. Techs came in on weekends and worked on it. Drove it up to her house ..... and sure enough, would stall at the tree.

It was even suggested, catch this, that someone should just cut the tree down! Got to laugh .....

The points, plugs, distributor, coil, wires, fuel distributor, fuel pump, fuel pump relay, iginition lock, fuse block, wiring looms, etc etc etc were all replaced. An incredible amount of hours, parts and frustration.

This was simply impossible. Not logical. Are there power lines near the tree? Is there a bump just before the tree? Is the car always warm before reaching the tree? Was she lugging the engine? What gear was she using? What type of oil, brand weight? Did this happen year around? Did she have passengers in the car? Was the trunk loaded? What was the weather? Had she ever washed her engine? Was the AC on? Was the rear window defogger on? Does this only happen when she drove the car? Were there crop circles near where she lived? You get the idea ....

It turned out that someone in the factory tossed a small ball of masking tape into her gas tank. Never created a problem until over time it started to expand and would wind itself around the fuel outlet and, with the proper inclination (her driveway), would starve the engine of fuel. A short incline wasn't enough time for the glop to move towards the fuel outlet. Her driveway was long enough to starve the engine of fuel.

The service manager was the one who figured it out. Carl Behr. He took a simple practical approach: Engine stopped receiving fuel. What causes fuel starvation?

He still has a small jar on his desk with the fuel and the continuing to expand small ball of wadded-up masking tape.

It is from: Hesitation Solved

Haasman

How then should I clean the fuel tank?

Is this going to be an expensive job - fishing out the masking tape????

I forwarded the story more for its entertainment than as a reason of what is causing your car to stall.

If it were mine, I would try to determine why it stalls ..... ie. fuel, electrical or some other problem.

For an example, is it only on one particular incline or any? Or will it stall when you wiggle the ignition key (thinking here a large cluster of keys on the key ring causing the tumbler contacts to move).

If, and only if, it is something in the fuel tank, then get access to the tank via through the fuel sending unit and shine a light into it and check the bottom of the tank. If there is something rolling around you could retrieve it.

Keep us posted,

Haasman

as your link showed,it would be water in the gasoline too.
Like ice pellets in sub-zero temps.

How about putting a fuel pressure gauge on it for a while? Jerry

I'm afraid I don't have the precise answer for you, but..

this similar problem existed for another member and another car (a 300E-124) I think. His problem was that the car wouldn't start when parked on an incline with the front facing "down" toward the bottom of the hill. Since I don't own that type, I don't remember the answer to solving the problem, but I think it was a "safety factor" that Merz had and was easily fixed.

Try searching for "300E not starting on hill or incline"

sorry I couldn't be more precise, but it MAY be that you have the "same" and can fix it easily.

I did a search and couln't find the thread to which I was referring.. maybe it was another forum, but I spend most of time here and not on others. sorry, but good luck. I think the previous posts should help you determine the problem.

What condition are the engine mounts and tranny mount in? It's possible that excessive engine movement from bad mounts is causing either the primary or secondary ignition to lose contact from a bad wire on deceleration.

Also check for vacuum leaks (hoses at the idle control valve are a prime suspect -- are they pliable or rock hard?) and for other vac leaks, and clean the air flow meter venturi.

Peter