Quote:
Originally Posted by natejgreene9871
I really need some help.
I have been struggling for almost 5 months now with a 1993 300e 3.2. It has the M104 and electronic injection. It is a cheap project car.
I have an intermittent electrical issue I cannot solve. The car fires right up for about 2 seconds and then stalls. It does this about 90% of the time. See video:
[MEDIA=youtube]l3wM8KxtFgQ[/MEDIA]
Once in a blue moon it will fire up and run just fine. I went on a 20 minute drive today. Turned the car off and then it wouldn't restart.
Interestingly, when I spray starter fluid down the intake the car will always run.
It seems like some kind of issue getting correct pulses to the fuel injectors.
I put a light on one injector and the pulses seem inconsistent in brightness?
[MEDIA=youtube]gRt3cR-4vlM[/MEDIA]
Everything I have tried:
-Entire fuel system has been disassembled and cleaned from the tank to the fuel rail. New filter, rebuilt injectors, tested pumps, new fuel press regulator, all of it
-All new spark plugs, wires, coils
-I have tried 3 different ECU's, all three were known good- same behavior on all
-New OVP relay (tried 2 different ones)
-new crank position sensor
-new cam position sensor
-main wiring harness has been replaced and is not biodegradable year
-rebuilt throttle actuator from reputable vendor
-I have cut open every harness in the engine bay looking for crumbling wiring and I can find none.
-cleaned the grounds around the battery
-confirmed the alternator is charging
-Smoke tested intake for vac leaks
-tried two different MAF sensors
-cleaned fuse box
-disconnected and bypassed the alarm
-tried moving the main harnesses around, jiggling wires around the battery trying to see if there is any change
Please does anyone have any ideas?
This thing has been stuck in my garage for 5 months now and I'm starting to consider parting it out but i really don't want to.
|
I know you replaced some of these parts already. Another thing to do is this: Check the wiring pinout of the components. For instance: I recently had an issue of only getting like 12-16 mpg on my w201 and I went through all the troubleshooting of the FSM. I replaced the parts with known good parts and I even checked and double checked the parts to make sure they were all within specification of the MB manual (i.e., resistance for CPS between 680-1200 Ohms, ignition coil between 8.5v-10.5v when starting, resistance of distributor to spark plug connector between 700 and 1300 Ohms, etc.) Everything checked out fine and I ended seeing a YouTube video of a guy who apparently was an expert when dealing with the KE Jetronic and the issue was the 2 pin connectors that plugged into the EHA were swapped around. So pin 1 (black wire, I think) was in the place of pin 2 (brown wire). I remember Replacing the plastic end on the connector and I must've swapped them around. You said you opened up your harness or had the harness upgraded so I would definitely check the pins against what it shows on the schematics. At this point you don't have anything to lose. Do you get a CEL error code?