I never did figure out what that red and grey wire was for, but I decided to just wire it to position 2 and give it a shot.
It still didn't run. I tried to install the ignition switch and steering lock assembly into the car, but discovered the prior idiot had apparently pried the old one out, breaking chunks out of the steering column in the process. I'll probably end up swapping the steering column from the 94 just so I can install the ignition switch.
The shifter interlock cable is also not working correctly. I'll have to tear into the shifter to figure out why.
None of that is the cause of the no start though.
I blasted some brake clean down the throttle while cranking and the car did fire, so I figured it was likely a fuel issue.
There was fuel pressure at the rail. Hooked up my gauge and got about 55 psi. So there's fuel pressure at the rail, and we know it already had spark. At that point it's reasonable to assume the injectors weren't firing.
I checked all my wiring connections and everything looked fine. I did find a blown fuse in the base module and replaced it, but the car still wouldn't run. Pulled out the noid light set and confirmed the LH was commanding the injectors to fire.
At this point I figured the injectors were probably bad. The car has been sitting for probably a year or two. It's certainly possible that the injectors are stuck. Also, if I let the car sit for 20 minutes or so, and then tried to start it, it would fire and run for a few seconds. That seems like the injectors were probably dribbling, again supporting the idea that the injectors were bad.
So I yanked the fuel rail and swapped in the injectors from the 94 S500.
Cranked the car and it still wouldn't start. Now, in the process of swapping the injectors I obviously lost all the fuel from the rail. I didn't know how much fuel was in the car, but I suspected it was very little. I rechecked fuel pressure at this point and discovered there was now no pressure.
Ok. I figured I must have run out of gas. So I dump in 5 gallons and try again. Still no fuel pressure. I can hear the fuel pumps running, but I'm getting zero fuel. I ended up actually cracking the fuel line loose just ahead of the firewall, and there was zero fuel.
Ok, so either pumps or filter. My shop is currently full of tables covered in engine parts, so I wasn't able to pull this car in and put it on the lift. So I jack the car up to have a closer look at the fuel pumps.
Oh boy. The fuel hoses in and out are rock hard AND full of multiple redneck repair splices. The pumps are dangling by the hoses and everything is disgusting.
Good news. The 94 ran fine. So I yanked the pumps, filter, and hoses out of the 94 and swapped them in.
That did it. It took probably 20 seconds of cranking and then the engine coughed and sputtered for a bit, but it did eventually wake up.
It's weird that the pumps seemed to be working at first, but not the injectors, and then the pumps apparently quit as soon as the injectors were replaced. I can't necessarily explain it, but it does now run.
It smokes quite a bit, but I suspect an Italian tune up will probably take care of that. The
oil pressure gauge is pinned at zero and the oil level light and battery light are on. Engine oil level is fine and I can see oil is circulating in the top end so I'm not really worried about it. I suspect a bad oil pressure sender. The charging system is also not working. Overall though I think it will work well for the Gambler, and as a parts car.
I already pulled the LH module and swapped in a 95 module I had instead. I plan to harvest those cams for the 400E's new engine and swap in a pair of later cams. I'll do a bit of testing to be sure the charging issue is actually the alternator, but I have a couple on the shelf if that turns out to be the case.
I'll swap the steering column so I can install the ignition switch properly. I'll probably try to sort out the oil pressure sender just for peace of mind.
It was a pretty productive beater Mercedes weekend.