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Re: back to my 242 again... 200 1980

posted by  someone claiming to be Don Foster on  Sat Nov 25 14:00 CST 2000 [RELATED]

"Was the engine running on just the cold start injector?"

Probably.

It sounds like a control pressure problem. This could result from something wrong with the control pressure regulator (which DOES have an electrical connection, and thus an opportunity for error). It could also be a misbehaving fuel pressure regulator, which is an integral part of the fuel distributor.

I'm fighting a similar problem on my '82 (K-jet), and measured the fuel pressure as outlined in the manual. The Volvo manual specifies around 3.3-3.5 bar control pressure, but my car was over 4.2 bar. (Higher control pressure results in a lean mixture.) My engine starts easily when I manually lift the sensor plate, but the engine vacuum is unable to lift it 'cause of the high control pressure.

The Volvo manual said only two things cause this: A plugged return line (mine is free 'n clear), or a defective pressure regulator. The regulator is only accessible with the fuel distributor out of the car.



Don Foster (near Cape Cod, MA)





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