Engine starts then dies
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Newbie
Joined: Mar 2021
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1987 300 SE w126
Engine starts then dies
Hi ! I own a 1987 300SE W126. 2 weeks ago i replaced the car battery but i did not run the car. Now that i want to use it, the engine starts for about 5 seconds and then dies. tried to start it more than a dozen times but it would die right after it has started. Am totally new to this Forum and I would appreciate and value whatever professional advise, comments, suggestions as to the reason why this happens and what i can do to make the engine run. Thanks.
Newbie
Joined: Aug 2016
Posts: 2
Likes: 0
1990 w126 300SE (EU) & 1989 560SEL (US Spec)
did you mean this happens when the engine is cold? (or hot, too?).... this could be for many reasons...cold start injector & its process, leaky injector (you have 6 of them), low fuel pressure meaning you lose pressure overnight (or 30+ minutes after you shut down the engine, etc etc.
There could be a bad fuel pump, fuel filter, fuel accumulator, I hope not, but internally leaking fuel distributor, EHA going bad (do you smell fuel while driving?)
Before you take it to a mechanic, try forcing fuel pump to do 2-3 may be 4 cycles to send fuel to the engine in the morning. Turn on the ignition (do not run the engine) and listen for fuel pump `s little buzzing for 1-2 seconds, then turn ignition back to 0 and do this again for 2-3 times then run the car.
You need to understand the system before people start changing parts. Sometimes you have to, but "which one" needs a good mechanic.
I`d suggest you watch/subscribe/make little donations these channel and videos. All kinds of engine problems are covered. Don't be like me, be patient, watch and take notes. It is complex but not a rocket science. If I can understand, you can, too.
Then you will have an idea and maybe work with your mechanic.
https://www.youtube.com/user/schilleryu/videos (he is very kind and fast to respond)
https://www.youtube.com/user/Mercedessource/videos
https://www.youtube.com/c/MercedesCl...eHedary/videos
Good Luck.
There could be a bad fuel pump, fuel filter, fuel accumulator, I hope not, but internally leaking fuel distributor, EHA going bad (do you smell fuel while driving?)
Before you take it to a mechanic, try forcing fuel pump to do 2-3 may be 4 cycles to send fuel to the engine in the morning. Turn on the ignition (do not run the engine) and listen for fuel pump `s little buzzing for 1-2 seconds, then turn ignition back to 0 and do this again for 2-3 times then run the car.
You need to understand the system before people start changing parts. Sometimes you have to, but "which one" needs a good mechanic.
I`d suggest you watch/subscribe/make little donations these channel and videos. All kinds of engine problems are covered. Don't be like me, be patient, watch and take notes. It is complex but not a rocket science. If I can understand, you can, too.
Then you will have an idea and maybe work with your mechanic.
https://www.youtube.com/user/schilleryu/videos (he is very kind and fast to respond)
https://www.youtube.com/user/Mercedessource/videos
https://www.youtube.com/c/MercedesCl...eHedary/videos
Good Luck.
