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1991 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp on
Posted to GM Driveability on 4/27/2005 10 Replies

This Cadillac 4.9 has 166,000 miles, Intermittently the engine will(hot/cold)stumble/hesitate, exhaust is black, Checking with the TECH I when this happens the readings are as follows; Coolant Temp shows -38F, MAT Sensor shows -38F, MAP shows 103, Throttle Ang...

10 Replies Received (View Replies)

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car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B3M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD I
SymptomsPoor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp On
OccursCold, Hot, Intermittently
Misc.Sedan Deville
Message Closed w/FIX

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B3M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / SEFI
EmissionsOBD I
SymptomsPoor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp On
OccursCold, Hot, Intermittently
Misc.Sedan Deville