i am missing christmas with my family because of my 03 chevy silverado 1500 5.3 vortec,
reduced engine power...keeps saying its asp. have new battery, new o2 sensors,new
water pump, new fuel filter, new maf, new gas cap. have checked the sensors on the gas
pedal and all under the hood. what is wrong with my truck???
On page 3-66 of your owners manual it says that the "reduced engine power" message will be displayed if the engine is overheating. Is the engine overheating? What actually happens is the computer begins alternately firing cylinders to help keep the engine cool. If you're not really overheating check the wiring going to the coolant temp sensor. It may be pinched and causing a short. If this happens the computer will THINK that the engine is overheating when it's not. If you're SURE that you're not overheating unplug the coolant temp sensor. This may cause the temp gauge on the dash not to work and it will cause the check engine light to come on but you should be able to drive normally and be home for Christmas. HTH. -Jim
What was the reason for changing all the parts you list. Did this start before or after the parts change?
Autozone. Put computer on it
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