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1992 Buick Riviera Base 2D Coupe

1992 Buick Riviera
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August 13, 2012, 5:06 pm

Eric M

Question: What is the cause of engine rough start

Not able to keep engine running without mashing the gas peddle to the floor. Dark smoke from tail pipe smells like unused gas? No service engine light came on. Told it was an intake manifold gasket?

August 16, 2012, 8:31 pm

Richard W
Expert Mechanic

You would not have the black smoke with a intake leak. I would say you havr a pressure regulator leak. Or an injector leaking. Both of those problems will not cause the CEL to come on.

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August 18, 2012, 3:52 pm

Eric M

After checking, it is not the pressure regulator or an injector, however when the mass air sensor was unplugged the engine came to idle with service engine light coming on. Also, there was no black smoke, though exhaust did smell. Is this the problem?

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August 18, 2012, 7:18 pm

Richard W
Expert Mechanic

Yes that is the problem. I would replace the MAFF

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