Question about 1990 Buick Regal

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Car looses power and cuts off.

Car looses power and engine shuts off

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  • Master
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Possibly a weak fuel pump, check spark plug gaps or replace plugs. good luck

Posted on Nov 19, 2009

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  • Buick Master
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If the exhaust smells like sulphur the cat converter ould be restricted or if you still feel exhaust coming out for a few seconds after the engine is turned off. It should stop immediately.

Posted on Nov 19, 2009

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  • Buick Master
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Sound like clogged fuel filter or faulty fuel pump.

Posted on Nov 19, 2009

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5.9 DIESEL ENGINE CUTS OFF WHEN DRIVING


Hi

From what I can gather, the engine cuts out and then the check engine light comes on, not the other way around, check engine light and then cut out?

If you switch on the ignition but do not start the engine, you will see that the check engine light is on. It won't go out until you start the engine.

When the engine cuts out, it is just as though you have switched on the ignition without starting the engine, the key is in the exact same position, and therefor the check engine light comes on purely and simply because the engine isn't running, not because it has sensed a problem, hence you have no fault codes, its perfectly normal.

If, however, the light comes on then the engine cuts out, then the reason for the lack of codes could be a short term electrical failure. If the power to the ECM were briefly cut then the codes would be erased immediately, but this would have to be a complete failure because there is a KAM (Keep Alive Memory) wire, which supplies permanent power to the ECM if I'm not mistaken. A good candidate for a complete failure is a bad main ground cable (loose or broken).

Wiring problems a just the worst ever to trace.

Just a thought to hopefully point you in the right direction.

Very best regards

Geordie

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