Engine Performance problem
2002 Chevy Avalanche V8 Four Wheel Drive Automatic 150000 miles
My Avalanche 2500 with the V8 engine will run about 1-2 miles and then loses power. It will stutter along for a bit and then may regain power. It will repeat this cycle almost for as many times as you have patience for. Although unless I turn the engine off the run time between failures gets less and less.
I have found that stopping, turning car off and then re-starting works like magic, for another 1-2 miles. Better yet, if I open the gas cap and leave it loose I do not have any problem at all.
There seems to be a relationship to the gas gauge. It is not working properly. However, when it suddenly drops from 1/2 tank to empty and turns on the low fuel indicator the car will run okay WITH the gas cap tight. Gauge starts to read half full and I must loosen the cap.
I have replaced fuel filter, fuel pump and the sensor on the air intact that is located just after the air filter. I have checked the air filter it is okay. I have added injector cleaner with no changes.
One last note. This all seemed to start after I ran out of gas. The gas gauge was not working. I ran out. Got towed and refueled. Ran several hundred miles over two days and then the engine quit and would not start. The garage diagnosed a fuel pump problem. They replaced the pump which did not fix the gauge although I have better fuel pressure and now the car does not quit when the engine problem occurs.
No codes have been thrown.
Where should I look next?
Friday, July 18th, 2008 AT 3:05 PM