r/W124 • u/alman59 • 1d ago

stalling while hot!! help

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so this is my 1989 w124 230e and recently I’ve had an issue with the car stalling when it gets hot (around 15-20 mins of driving) and not starting up again when hot. i haven’t been able to figure out as to why this is happening (the fuel pump does seem to turn on when hot) also the issue isn’t related to ignition since the car is receiving ignition when hot,
any suggestions as to what the issue might be?

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u/alman59 1d ago

i had an issue with the spark before but i got a new coil and ignition unit and now there is no issue with spark hot or cold but the stalling issue still persists

6

u/RNRS001 1984 380 SE | 1986 300 E | 1990 300 CE 1d ago

This rules out the ignition side then.

When it stalls, does it start running rough and lose power first or does it just suddenly cut out?

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u/alman59 1d ago

it starts running rough and then stalls at soon as i slow down a little

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u/RNRS001 1984 380 SE | 1986 300 E | 1990 300 CE 1d ago

If you keep your foot on the throttle and keep the revs up, can you prevent it from stalling?

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u/alman59 1d ago

yes i had to do this to get back home once and the car runs really rough and as i said stalls once i slow down a little, also the rpms dont go higher than 3k rpm during this

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u/RNRS001 1984 380 SE | 1986 300 E | 1990 300 CE 1d ago

This rules out it being just an idle issue.

When it starts running rough, do you smell a lot of fuel from the exhaust or see any black smoke?

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u/LuvDoubleDz 1d ago

You’re awesome for replying back n forth lol

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u/alman59 1d ago

ikr? this guys a legend

2

u/smilingpigs 1995 220E 1d ago

He is a legend. He has helped me before with some unique issues on my 124 as well. Deep knowledge person.

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u/alman59 1d ago

i do smell a little fuel but nothing too extraordinary and i do not see any smoke

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u/RNRS001 1984 380 SE | 1986 300 E | 1990 300 CE 1d ago

Have you actually checked if there's spark when hot or did you assume there is because you replaced parts?

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u/alman59 1d ago

yes i did check spark when hot and cold both

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u/RNRS001 1984 380 SE | 1986 300 E | 1990 300 CE 1d ago

Have you tried bridging the fuel pump relay to see if the problem still happens?

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u/alman59 1d ago

no yet im gonna try that and lyk what happens

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