S550 Electrical Issue

[jev0918]

Any help or advice would be appreciated
Car stumbles and sometimes dies at idle after warmup runs good driving if u kill it and get back in and start it up u have to turn it over for a few seconds and touch gas to make it start smells rich, also when you close door and window seals car wants to die.
Car is SC have a lot of new parts
Any suggestions

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[NGOT8R]

Fuel pump possibly going bad?

 

[jev0918]

So brand new DW 400 FP
Window motors, Alt, Crank Sensor, Bosch ID 1050 Injector, plugs etc

 

[SBR70.3]

I have to ask the obvious question, was the fuel system installed correctly?
How long have the s/c and associated mods been on your car? When did this problem start?

 

[jev0918]

Yes sir I have a fuel gauge on rail it never changes until it kills
Bought the car Oct of 24 already had SC and mods except injectors and FP so it’s been like this since I purchased it so I think it’s electrical something between shutting door circuit and timing changing I thought maybe someone heard of this thanks for asking makes me think about it

 

[NGOT8R]

Does your DW400 have the check valve in it? I bought one for mine (which must have been an old unit sitting on a shelf in the distributor’s warehouse) that didn’t have the check valve in it. Lack of a check valve can cause hard start issues during warm starts. I ended up adding a DW inline check valve to remedy this issue with mine.

 

[sloopy]

I would replace the battery if you have the money. A failing battery can cause strange issues even if it still holds a charge well.

 

[jev0918]

Brand new brother

 

[Paddles]

Any help or advice would be appreciated
Car stumbles and sometimes dies at idle after warmup runs good driving if u kill it and get back in and start it up u have to turn it over for a few seconds and touch gas to make it start smells rich, also when you close door and window seals car wants to die.
Car is SC have a lot of new parts
Any suggestions

Almost sounds like alternator/battery not providing enough power. Could be causing a weak spark. Already check your grounds?

Does rolling both windows up or down at the same time cause it to stumble even worse or is it only when closing the door?

Is the new battery/alternator OEM?

See any electrical arcing in the engine bay in the dark?

 

[jev0918]

When both are up and you close either door it stumbles

alt- OEM new 14.2 constant
Battery OEM New
Not that I see I went over it pretty good grounds I checked all of them cleaned paint and retighten I am at a lost withnit

 

[eisenhauer01]

Does any other load (headlights, brake lights, ac compressor) make any difference? Or is this issue solely isolated to the window motor load when going all the way up?

Does the same issue present when you put the window all the way down?

What is the voltage reading when running (fine) and then what does the voltage drop to when you close the door or roll a window up?

Could be multiple things, but these answers can help us isolate the problem.

 

[jev0918]

Voltage stays consistent 14.2 14.1
Lights on ac on same 14.1
I’m thinking maybe BCM back feeding ECM causing timing to go nuts I have data log the issue tuner thinks it’s electrical causing timing issue

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