When I plug in the temperature ascending unit, the motor speeds up. Unplug it, it slows back down. What could cause this?

Asked by Feb 12, 2015 at 05:22 AM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

7 Answers

70

Most temp. sensors that goes to engine computer determines if ecm is in open or closed loop. I think open loop is below 57 deg. F. you can check your sensor with scanner. should be within a couple degree's of actual engine temp. The colder the coolant sensor reading is the more fuel ecm gives engine. Just like the carburetor does with choke. Check your sensor reading and see what the reading is.

7,270

That would be engine coolant temperature sensor. ECT A temperature sending unit would operate the temperature gauge indicator.

58,825

Sounds like the sending unit is bad and telling the computer that the engine is cold when it's not. This will put it on fast idle. HTH. -Jim

7,270

The sending unit? or the ECT ? ECT sensor would be connected to affect runability, you must mean

70

Keeping it simple. first sentence says= sensor that goes to engine computer.

7,270

Right. I know that ukno, and ukno that I kno but do they kno?

58,825

Some vehicles use the same sensor for the computer and the gauge on the dash. HTH. -Jim

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