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Starting problem intermittently 900 1994

posted by  kurtb4 on  Mon Aug 6 17:32 CST 2007
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last visit: Fri Sep 14 17:53 CST 2007
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Hi,
My 1994 Volvo 960 has developed a weird starting problem. When the engine is medium warm or warm it will not restart at times. When it fires the mixture must be too rich as evidenced by black smoke coming out the exhaust. After running rough on a few cylinders for a few seconds the mixture leans out and the engine runs great. Sometimes it will not start at all. Mileage 96000.

When I disconnect the battery and let the computer go back to its default the engine starts fine. After about 10 plus miles the sensors are coming back on line and the trouble starts again. There are no error codes or any engine service lights.

As we live a distance from the nearest repair facility it is impractical to turn in the car if the problem does not happen all the time. Any insight into this problem will be appreciated.

Regards,
Kurt







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Starting problem intermittently 900 1994

posted by  DanR on  Tue Aug 7 03:30 CST 2007
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last visit: Thu Oct 23 15:25 CST 2014
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You have a bad fuel pressure regulator, had the same symptoms. The next time, it is not starting open the hood and pull the vacuum hose of the regulator, bet raw fuel is dripping out of the hose.

DanR '94 964 332,000 miles (98,000 on the new engine)
--
DanR








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Starting problem intermittently 900 1994

posted by  kurtb4 on  Fri Aug 31 17:48 CST 2007
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last visit: Fri Sep 14 17:53 CST 2007
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I will check as you suggested. Thanks for the tip.
Kurt







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