1987 300e start then stall
 

Hey guys,
This vehicle was towed in a no start,it ran fine the nite before.
After adjusting the the co% at fuel dist I got the vehicleto start
But stalls n jus seconds,will run as long as u spray eithe
... Also if you leave the key n the start position (overrun) starter
Runs till released.an has batt voltage at dist all the time key is on
Jumped pin 7 & 8 pump runs replaced filter was clogged
Wen depressing air meter plate all four injectors spay ok did visual
Engine jus cranks wit pins jumped. Noted 79 psi.on fuel gauge
But adaptor leaked.parts replace (used)3 ovp,2 fuel relays,1 cps,
2 fuel dist,1 ign module,1 eha original leaked,drained fuel.was
Dirty, laid all six plugs in wires on exh manifold.fat SPL on all on tim
Replaced both iac hoses,1 cold start valve.vehicle will only run forr
Couple seconds,anti_loc lamp off while running.pumpturns off after engine
Stalls, I DID NOT REPLACE FUEL COMPUTER YET. Vehicle starts then stalls.
Any suggestions appreciated.

If you leave the BRIDGE in, instead of the fuel pump relay, does the engine stay running?

Hi doc,
No it just cranks, when relay reinstalled. Will run for Couple seconds then stall.
It just bogs down. Can fuel computer cause this symptom?

Hi doc,
No it just cranks, when relay reinstalled. Will run for Couple seconds then stall.
It just bogs down. Can fuel computer cause this symptom?

What fuel computer???? Check the rubber under the air flow meter and the rubber going thru the idle valve, this sounds like cracked rubber to me.

Hey Thxs for speedy response. Ecm, ecu behind batt...duct under fuel dist is
Ok .I replaced iac hoses ?

Hey Thxs for speedy response. Ecm, ecu behind batt...duct under fuel dist is
Ok .I replaced iac hoses ?

The engine can even run without the ECU, are both fuel pumps running? Engine will not start if one is not running.

Ok I spliced in 12v to fp at relay pump runs continuously
Same symptom.start then stall. Never tried to start vehicle without ecm.
But I did test with substitute ecm... Same system. I did note that
When cracking fuel inlet fitting at fd fuel rushes out vigorously.shot at least ten feet.
But immediately after. If u close fuel line. An operate pump. Then
Remove bridge.an open line theres no rest pressure. What is this indicating??
Also does this application hav a pump n thee tank.cus theres
Only one external pump. Please advise

There is only one pump, there isn't one in the tank. (Some MBs have 2 pumps so it can be confusing)

Possble regulator or accumulator or EHA.

Possible bad fuel.

Possible ignition rotor or rotor bracket.

Hi Gilly,
I pinched rubber return line. And there is no rest pressure. Eha replaced symptom persist.
Drained fuel from tank.replenished fuel.rotor and cap are ok. Will replace fpr and accumulator, and report back

Well I'd STOP replacing parts and find the problem for one thing.

Hey guys,
Does anyone have the wiring diagram for the ignition circuit for
This vehicle. I need to trace and diagnose the circuit that keeps
Engine running after key is released. Symptom vehicle starts
Effortlessly then stalls in a couple seconds.if you hold key after starting(overrun
Starter) vehicle continues to run when key is released.vehicle stall in couple seconds.
Need to diagnose the run circuit...

Oh btw replaced ignition switch, symptom persists