1992 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy

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Posted to GM Driveability on 8/18/2003 5 Replies

Hello fellow tech.

I have this Cadillac that runs good cold. However after it warms up, the idle is a little unstabale. If you turn on the a/c it acts if the sefi loses its sequence. Or If you power brake the system to put a load on the engine, it will do the...

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Vehicle Data

1992 Cadillac DeVille

VIN	1G6CD53B1N
Engine	4.9 L / 8 cyl / GAS
Trans	4-speed Automatic (Electronic)
Delivery	FI / SEFI
Emissions	US-FED
Symptoms	Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy
Occurs	Hot, Under Load

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Vehicle Data

1992 Cadillac DeVille

VIN	1G6CD53B1N
Engine	4.9 L / 8 cyl / GAS
Trans	4-speed Automatic (Electronic)
Delivery	FI / SEFI
Emissions	US-FED
Symptoms	Excessive Emissions, Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy
Occurs	Hot, Under Load

5 Replies Received (View Replies)

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Vehicle Data

1992 Cadillac DeVille

Vehicle Data

1992 Cadillac DeVille