Loads up BIG TIME

[HellOnWheels]

87 GN, cold starts only.

On cold startups the engine will fire and the rev will go up and down and in just a few moments the black smoke will be rolling out the exhaust!!??

I can unplug the coolant sensor (the one that points toward the front of the engine) and she will start and run as normal??

Plug up the sensor after a short warmup and all is normal...what is the problem?????

TIA
HOW

 

[buickboy]

Sensor out of cold start calibration. My opinon is to replace sensor! Pricey but essential to fueling of the motor.

Mitch