Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!
did you swap over any parts from the old engine to the newer engine?
also fyi the airflow plate is opened strictly by airflow and levers against a pintle in the bottom of the fuel distributor (spider looking unit) so please do not press against it or you can damage the lever or fuel distributor.
Yeah plastic on the old cars is never good. So it's possible you have a huge vacuum leak and the reason the car runs when pressing the plate down is because you are actually forcing more fuel pressure and quantity out of the injectors.
i am here looking over the info, these systems are not that easy to diagnose especially since you had it working on the old engine and not the new.
let me opt out to see if another expert can help, i know there is an expert that has dealt with these many times. hopefully he will jump in.
Hi, my name is***** you keep the car running by manipulating the air flow sensor plate? It would be a lot easier if I called you.
Do you want me to call you? You will need to accept the phone offer if you do.
Can you get it to idle by manipulating the plate?
Okay, it sounds like you have an intake leak or a fuel pressure problem. First I would smoke test the intake for vacuum leaks. Next I would run a fuel pressure test. If you have no leaks and the fuel pressure is correct I would adjust the fuel mixture.
Then I'd adjust the mixture.
You're not trying to move the plate by adjusting the mixture you are changing the relationship of the plunger in the fuel distributor to the plate. When you push down on the plate you are adding fuel. You should make sure the fuel pressure is good. You should also make sure that the overvoltage protection relay is good and that the fuses in the relay are not blown.
There is one are two fuses in the OVP relay that power the EHA valve on the side of the fuel distributor. The relay is located at the back of the engine compartment. Turn the mixture screw very slightly in the clockwise direction in order to richen the mixture. The mixture tower is between the air flow sensor plate and the fuel distributor. You need a 3mm Allen. Press down on the spring loaded adjuster with the Allen to engage the mixture screw below.
Just checking in. Do you need anymore help with this?