190E (W201) 1982-1993: 190E 2.3, 190E 2.6, 190E 2.3-16, 190E 2.5-16, 190 D 2.2, 190 D 2.5, 190 D 2.5 TURBO, 190E 2.5-16 Evolution I, 190E 2.5-16 Evolution II

190e -84 runs very bad and stalls when warm

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Old Feb 25, 2020 | 04:32 PM
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190E 2.0l 1984
Angry 190e -84 runs very bad and stalls when warm

Hi, so i got a 190e from -84 with a annoying issue. The car starts up fine and runs fine but after it gets warm ( usually 5-10 minutes) it starts stalling and will not respond at all. If you give it too much gas it just dies and it will have a hard time starting again, you can manage to move if you slip on the clutch with little gas but even then when i put in the third gear its too much and it dies. I basically can't drive it all. Sometimes it backfires if you force it gas. I can hear the fuel pump go off when i turn the ignition. I really wouldn't like to spend too much money on it buying parts until i find whats wrong so i was hoping you guys could have an idea. Thanks in advance!
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Old Feb 27, 2020 | 05:22 PM
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1991 190E 2.3
maybe a clogged fuel filter?
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Old Feb 28, 2020 | 09:48 AM
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190E 2.0l 1984
Originally Posted by 190Efan
maybe a clogged fuel filter?
That crossed my mind, however wouldn't the car run bad pretty much from start if that's the case? The problem occurs at 80c or close to it. I've read a bunch of threads on different forums and found a few with the same symptoms as my car and i read that a bad ignition coil can give such problems. What do you guys think about that? I might add that if you stop the car when it stalls and you wait 30 seconds to a minute it will fire up and run fine for a couple of hundred feet until it stalls again, like if something was getting too hot?
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Old Feb 28, 2020 | 10:11 AM
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Originally Posted by Fistekake
That crossed my mind, however wouldn't the car run bad pretty much from start if that's the case? The problem occurs at 80c or close to it. I've read a bunch of threads on different forums and found a few with the same symptoms as my car and i read that a bad ignition coil can give such problems. What do you guys think about that? I might add that if you stop the car when it stalls and you wait 30 seconds to a minute it will fire up and run fine for a couple of hundred feet until it stalls again, like if something was getting too hot?
have you checked the 02 sensor or the coolant temp sensor?
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Old Feb 28, 2020 | 11:33 AM
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1991 190E 2.3
Originally Posted by Fistekake
That crossed my mind, however wouldn't the car run bad pretty much from start if that's the case? The problem occurs at 80c or close to it. I've read a bunch of threads on different forums and found a few with the same symptoms as my car and i read that a bad ignition coil can give such problems. What do you guys think about that? I might add that if you stop the car when it stalls and you wait 30 seconds to a minute it will fire up and run fine for a couple of hundred feet until it stalls again, like if something was getting too hot?
It might be a partial clog. There might be enough room to start the car with but once it starts running it's too clogged to continue running. I would try checking the fuel filter first to see if it's clogged. You might also want to flush out the fuel lines to be sure there's no clogging there. After that, then try the ignition coil. It might be that as well. It could be shorting out and that might be why it's running intermittently.
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Old Feb 28, 2020 | 11:40 AM
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190E 2.0l 1984
Originally Posted by insame1
have you checked the 02 sensor or the coolant temp sensor?
The car don't have a 02 sensor. I changed this sensor: see picture. But what are the 3 others? Tried to drive while unplugging each one at a time including the cold start valve plug but no improvements.


Last edited by Fistekake; Feb 28, 2020 at 11:48 AM.
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Old Feb 28, 2020 | 11:43 AM
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190E 2.0l 1984
Originally Posted by 190Efan
It might be a partial clog. There might be enough room to start the car with but once it starts running it's too clogged to continue running. I would try checking the fuel filter first to see if it's clogged. You might also want to flush out the fuel lines to be sure there's no clogging there. After that, then try the ignition coil. It might be that as well. It could be shorting out and that might be why it's running intermittently.
Thanks, i think i'll order both. That would be an easy fix. I guess time will tell. In the meantime im open for more suggestions and tips!

Last edited by Fistekake; Feb 28, 2020 at 11:47 AM.
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Old Feb 28, 2020 | 07:53 PM
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I don't remember much about the fuel systems on the W201's, but could the engine in any way be depending upon the cold-start system for fuel? I had a VW that did that, and it wouldn't start at all if warm. Started fine when cold. Just thinking. . .
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Old Feb 29, 2020 | 06:02 AM
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190E 2.0l 1984
Originally Posted by SteveE400
I don't remember much about the fuel systems on the W201's, but could the engine in any way be depending upon the cold-start system for fuel? I had a VW that did that, and it wouldn't start at all if warm. Started fine when cold. Just thinking. . .
I did try to unplug the coldstart valve, it started fine without it but ran just as bad once it got warm
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Old Mar 1, 2020 | 09:06 AM
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Originally Posted by Fistekake
The car don't have a 02 sensor. I changed this sensor: see picture. But what are the 3 others? Tried to drive while unplugging each one at a time including the cold start valve plug but no improvements.

are you sure? https://www.partsgeek.com/catalog/19...en_sensor.html
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Old Mar 1, 2020 | 12:43 PM
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190E 2.0l 1984
Originally Posted by insame1
Nothing on the exhaust. Also if there were the cable to it would be under the floor of the passenger side.
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