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Re: Fuel Issues
Engine coolant temp sensor could be bad. Colder engine needs more fuel. The other area to check is the MAP sensor and the vacuum hose to the sensor. Low vacuum at the MAP tells the ECM that the engine is under load so if the MAP sensor or the hose does not hold vacuum, it will use more fuel. Also, the port on the TBI is restricted, this will also fool the MAP to think that the engine is under load.
On my 90 K1500, the end of the hose at the MAP was leaking and I had to replace it. The rubber end is glued on and the glue no longer was working.
Injectors could also be bad but like MT-2500 said, a scan will show you if the MAP sees the engine is under load or if the ECT sensor is off.
//2000CAYukon
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