Arthur ..... Great use of my old R12 gauges (I sold my last R12 car).

It does not appear to be a fuel pressure problem; Idle with vacuum, 55 psi; without vacuum, 61 psi; with engine off, 50 psi. Possibly a little high but very close.

Checking the plug "thing" under the coils was one of my first checks. I tested them with an ohm meter and they, and the wires had 1.8-2K ohms. I believe that I replaced them long ago at your recommendation.

I am not sure of the plug numbers but they are Bosch copper from my local dealership (they give me good prices so I buy a lot from them. With my discount, even 190SL parts are cheaper than the speciality suppliers).

I guess that ERG is next.

I checked the LED (in the DM) readout with the engine idling and received a 7 code, "Ignition System failure". This sounds promising but I am not sure what it really is saying. After a search and some reading, I'll pick up three of the connectors under the coils and a new set of F8DC4 plugs.

Is there a way to test the coils? There is no resistance between the center tap and ground.

The oxygen sensor is another "easy" replacement part. I'll pick one up next time that I am out.

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Jim Villers
190SL, 230SL 5-speed, 95 E320 Wagon, 01 E320 Wagon, MGB, Boxster 'S', 190SL "Barn Find"