I'm not sure if I have just one problem, or if it's a combination of problems. The first symptom was the car stalling at idle. I checked the distributor cap and cleaned the rotor and that problem seemed to disappear. The cap and rotor (and plugs and wires) have about 10,000 miles on them. The fuel injectors, seals, and holders are about the same age also.

The next (and current) symptom is the car bucking (missing?) and stalling on acceleration. I changed the fuel filter and fuel pump and the problem is a lot less pronounced, but is still there. The car doesn't buck as much, but it does still stall on acceleration most of the time. I drained and replaced the gas also. I thought maybe I had some bad gas.

I tried to attach my fuel pressure gauge, but I don't seem to have enough clearance at the lower chamber plug. The smaller fuel line from the distributer to the fuel pressure regulator is in the way.

I don't know if this makes any difference, but when I had the air cleaner off and tried to start the car, white smoke was coming out of the breather hose that connects the valve cover to the air cleaner. Not a lot, just a little.

I pulled all of the plugs and none of them were fouled. They also didn't look tan like the old set of plugs. They weren't wet either. They seemed to be a cross between tan and black. They are Bosch H9DC0. I'm thinking about replacing the plugs, but I don't think that is the cause of the problem.

At this point, I'm somewhat at a loss. I can't seem to connect the fuel pressure gauge to help diagnose and I'm not sure what else to do. Any ideas?

Thanks

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino