jumpinjimmy

out of the clear blue sky, my 1981 euro 928 has started acting as though it's only running on a few cylinders and is heaving black smoke. Any starting points on diagnosis or deeper thoughts would be greatly appreciated. Also, I am actually located in europe.....would injectors from an american supplier work on my 240HP car?

Steve in France

yardpro

normally black smoke means too much fuel, or incomplete combustion

SeanR

Warm up regulator or cold start injector is dumping fuel in would be my first guess.

2nd guess would be no spark at spots and the fuel is burning up in the cats, if you have cats that is.

James Bailey

All the CIS injectors are the same BUT it is NOT an injector problem ! Most likely a control pressure issue. Read up on CIS and how it works and note that the warm up/control pressure regulator sets the mixture all the time. To check pressure you need the fuel pressure gauges/kit and some specifications for the 928 CIS.

jumpinjimmy

Are you able to recommend a site for studying up on the CIS units and potential problems and remedies?

Thanks,
Steve

RFJ

Here, use search on right side you will find it.Best, Ray

Speedtoys

The green handle at the gas station..is diesel.

jumpinjimmy

you're out of luck if you come to France, yellow is diesel, green is unleaded.

tailpipe

check your carbon canister if the diaphram in the accumulator ruptures it forces fuel through the carbon canister into the vacum lines and into the engine usually you will smell gas from under the pass side front fenderwell might even see raw fuel dripping from under the windshield washer tank. good luck..

Dennis Wilson

Pull your air filter housing and check for fuel in the lower plenum below the air sensor plate. The same thing happened on my 78 euro when the lower seal went. It caused it to get fuel through the injectors and the intake air.

Dennis