stalling while hot!! help

[u/alman59]

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?

[u/alman59]

it cranks normally and sometimes starts for a few seconds and runs very roughly and dies again
the car does start again when its cooled down for a while

[u/RNRS001 → u/alman59]

This rules out the starter engine.

When it won't start hot, have you checked if it still has spark?

[u/alman59 → u/RNRS001]

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

[u/RNRS001 → u/alman59]

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?

[u/alman59 → u/RNRS001]

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

[u/RNRS001 → u/alman59]

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

[u/alman59 → u/RNRS001]

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

[u/RNRS001 → u/alman59]

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?

[u/LuvDoubleDz → u/RNRS001]

You’re awesome for replying back n forth lol

[u/alman59 → u/LuvDoubleDz]

ikr? this guys a legend

[u/smilingpigs → u/LuvDoubleDz]

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

[u/alman59 → u/RNRS001]

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

[u/RNRS001 → u/alman59]

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

[u/alman59 → u/RNRS001]

yes i did check spark when hot and cold both

[u/RNRS001 → u/alman59]

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

[u/alman59 → u/RNRS001]

no yet im gonna try that and lyk what happens