E320 Stalls After Idling For 15 Minutes
 

This is 97 e320 (13000miles) had been in accident air bags deployed, no phisical demage to engine.

I just received my obd II scanner .
I read the codes: PASS NO CODES

There is no check engine light comming on.


I just replaced 3 resistor ends on the 3 ignition coils.

I replaced the air mass flow sensor.

I removed the old spark plugs champion c11ycc, they were all with black charcoal on their tips.


I installed the spark plugs Bosch super f8dc4 gap 0.34.

I started the car and it started running rough and backfire and while it was running I disconnected the plug from cam positioning sensor and also from idle stabilizer for a few seconds .

After about a minute or 2 the car started to run super smooth like a swiss watch.

It was running for about 5 minutes temperature 85C, I pressed the accelerator a bit but started very rough and from that moment on was getting worse and worse while idling and then it stalled.I could not get it started again , it looks like it is flooded,

The next day I started the car again and again rough for 1 or 2 minutes than super smooth like a new car for about 15-20 minutes and rough again and then stalled, could not start it again.

While the car is running smooth and I touch the gas pedal it starts rough backfire and stalls.

I did not check fuel pressure yet, only opened the valve on the fuel rail to see if there is fuel , it is comming like from water house.

I removed the vacuum line from fuel pressure regulator to see if it is leaking , it is not leaking.

I appreciate all the help I can get to get my car running and driving.

Thanks allot

Could my problem be something wrong with the
Fuel?
Ignition?
Ccomputer?
or something alse?

Thanks for your help

I would guess you have a bad mass air sensor or a bad throttle actuator.

It could be the wiring harness going bad like M104s do, but I think that MB had the problem solved by '97 (?).

bad mass air sensor ?

I have replaced this one, but there are no codes comming up on the scanner

The wiring problem I read was e320 93-95 , I could be wrong

Could this be the fuel pressure regulator?

Am I on the right track with the fuel pressure regulator?

Thank you very much for any help

Its always best to start with basics and fuel pressure is most basic. Fuel pressure problems can be intermittant also.

After you have proven fuel pressure one way or the other, the next step is to identify what is changing. Throttle angle, timing, injection pulse width, integrator, actual mixture, O2 sensor value. Look to those things and find what is changing when it runs bad.

Thanks stevebfl

I will check the fuel pressure thirst and let you know the results

I just checked the fuel pressure today
The tester maybe not the most accurate but this is what I got today

51.5 psi at idle
60 psi with vacuum hose removed from fuel pressure regulator
42.5psi after engine was off and climbed to 58psi within 30 minutes

Does that sound normal?

I still can not drive the car

Any hel appreiated

Are you saying the car is not running now?

I guess I need a refresher on the symptoms. From the original post I thought this to be a time dependant reoccuring happening. If instead it has degenerated into a continuous condition that isn't fuel pressure related, one needs to tell if the injectors are openning and if the ignition is firing. You might look at a spark plug and see if it is fuel soaked.

If it were a plain no start I would also be sure of your key. Try another.

No the car does not run
When I start the car it runs rough for 1 or 2 minutes than super smooth like a new car for about 15-20 minutes and rough again and then stalls, could not start it again for possibly hours.
Does not drive
when pressing on gas pedal backfires and stalls.

Is there something in Mercedes like it is in a Ford that after an accident the car is not possible to start.

When I checked the old spark plugs they were black only I don't think they were soaked.

Thank you for help

If the car doesn't drive what does it do for 20 minutes smoothly. If it only idles what happens when you put it in gear, what happens when you try to drive off?

If the accident had messed with the security system it wouldn't start at all. it could have affected other things. Does the fuel pressure stay constant when it goes from running smoothly to not at all.

Whe trying to drive off it drives as long as I do not press the gas pedal.

I did not check the fuel pressure to see the moment when going from running smooth to stalling I hope to do this this evening and let you know

Thank you

Hi,
Sounds like your car is stuck in Limp home mode, runs smooth until you accellerate then it backfires...just as mine. I should try to find all the reasons why the computer chooses Limp mode, help anyone?, and start eliminating items.
L.

Hi

The fuel preassure does not change when car starts to stall

When I remove 1,2 or 3 injector wires counting from the front of the engoine the car starts to run better but still does not drive.

Is it something with fuel?

ignition coils?

computer?

dashbord .? ( it says display defective with a picture of a radiator between the 2 words)?

wrong car?

the car was in an accident.!

dealer only?

i appretiate your help

Thank you