PeachParts Mercedes-Benz Forum - View Single Post

JamesDean · #2 03-04-2014, 02:00 PM

Quote:

Originally Posted by lorainfurniture

ovp only controls the "E" in the cis-e system. It would cause rough idle, stalling, but would always restart.

Op, check fuel pressure when the car stalls, then check for spark.

The only things that can cause the stalling when warm with no restart until cold again are:

1. Fuel pump, or fuel pump relay
2. Crank position sensor. Should ohm ok at 1200ohms.
3. Ignition system failure including Distributer cap, rotor, and possibly wires.

Thats it.

Coincidentally I am running into a similar problem on my 420SEL. Just happened all of a sudden. arg. I was on my way to work today. I pulled off the turnpike and noticed the engine rmps drop below 500. I pulled it down a gear, and kept them up for a bit. Then I hit the EZ pass line and had to stop. She stalled and didnt restart. I pulled all the relays, put them back. No difference. I tried to jumper the fuel pumps ON but it was hard to hear if they were on. I wasn't sure which 87 pin was the pumps. I tried all of them I think. One of them gave me a click somewhere in the engine. Maybe something to CIS. Anyway, towed it back home and sure enough it started up at the garage. Oy.

Best I can tell the pumps and accumulator are original at 225K.