W124 M103 Engine wont start
Thread Starter
Newbie
Joined: Jun 2017
Posts: 2
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Mercedes Benz W124 300E
W124 M103 Engine wont start
Hi all. I'm a new member here, and i have a problem with my 87 W124 300E.
My car wont start if i not pushed down the air flow plates. And if i do, the car just started and running fine. And if i shut the car off. It wont start again before i pushed the plate down again.
So i assume the fuel distributor are not inject the fuel before i pushed the plate down.
And here What I do to trying to fix this problem
-Rebuild the fuel distributor. And I'm tested it many times and no fuel leaks when the fuel pump kicks in.
-adjusting air mixture. No luck. in the end, the car just running rich or won't start at all. Or it started if i unplug the fuel pump relay
- replace the FPR. This part is the only untouched. I dont know how to adjust it.
-new fuel filter
-new fuel pump
-Adjusting EHA. Same like air mixture. No start or running rich.
-all relay and fuse related with fuel system is good.
So, there's possible if i just make the depth of the air flow plate more deeper down? And how?
Any suggestions will be very appreciated
Thankyou 😊
My car wont start if i not pushed down the air flow plates. And if i do, the car just started and running fine. And if i shut the car off. It wont start again before i pushed the plate down again.
So i assume the fuel distributor are not inject the fuel before i pushed the plate down.
And here What I do to trying to fix this problem
-Rebuild the fuel distributor. And I'm tested it many times and no fuel leaks when the fuel pump kicks in.
-adjusting air mixture. No luck. in the end, the car just running rich or won't start at all. Or it started if i unplug the fuel pump relay
- replace the FPR. This part is the only untouched. I dont know how to adjust it.
-new fuel filter
-new fuel pump
-Adjusting EHA. Same like air mixture. No start or running rich.
-all relay and fuse related with fuel system is good.
So, there's possible if i just make the depth of the air flow plate more deeper down? And how?
Any suggestions will be very appreciated
Thankyou 😊
Junior Member
Joined: Mar 2017
Posts: 65
Likes: 12
1995 E420, 1998 E300TD, 2002 CL230K 6spd, 2002 CL230K auto, 2002 CL280T VR6 Project, 2001 A6 2.7T
Sometimes the engine can backfire and cause the airflow sensor plate to become displaced and there is a procedure to re-center the plate in the venturi and another procedure to set the basic "rest position" of the plate. If I recall correctly there is a small steel pin in the top of the mixture regulator housing that can be carefully driven down with small punch and a hammer in order to set the basic position. Ive seen the pin get pushed up by the airflow sensor plate arm when a backfire occurs. The setting is very specific and must be set correctly before even attempting to further regulate the engine.
Thread Starter
Newbie
Joined: Jun 2017
Posts: 2
Likes: 0
Mercedes Benz W124 300E
Sometimes the engine can backfire and cause the airflow sensor plate to become displaced and there is a procedure to re-center the plate in the venturi and another procedure to set the basic "rest position" of the plate. If I recall correctly there is a small steel pin in the top of the mixture regulator housing that can be carefully driven down with small punch and a hammer in order to set the basic position. Ive seen the pin get pushed up by the airflow sensor plate arm when a backfire occurs. The setting is very specific and must be set correctly before even attempting to further regulate the engine.
Thankyou for your answer btw
Junior Member
Joined: May 2017
Posts: 25
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1987 MERCEDES 300E
http://www.w124performance.com/servi.../07.3-1665.pdf
Here is the shop manual link to adjust the airflow plate.
Here is the shop manual link to adjust the airflow plate.
