I have a 2001 Chevrolet S-10 ZR-2 4x4 with the 4.3L engine (vin W) with 24K miles. This truck ran great until I had the oil changed at one of those quick lube places. Since then, this truck runs 55mph @ 2000rpm until the temp guage reaches approx 160-170 degrees. Then, once the engine reaches that temp, the rpm's fall off to 1400-1500. Once this happens, the truck has no power until you force a downshift by pushing the excellerator to the floor. I have replaced the fuel filter, all three O2 sensors, tps, iac valve, maf sensor, air filter, ran fuel injector cleaner through the tank, iat sensor, and I even boroscoped down in the intake manifold and found two wet intake valves after the truck had been shut off for thirty minutes. Maybe a sign of a leaky fuel injection system? I also cleaned the egr valve and bought a scantool with no codes present. I am at a loss. Some say check the Catalytic Converter, it does smell like the rotten eggs. Fuel mileage dropped off the face of the Earth. 70 mph is @ 1700-1800 if I am lucky. This engine doesn't have power at that rpm/speed. Can you think of anything I should check? Thanks, Curry52525
have the same problem?
Monday, November 6th, 2006 AT 8:20 PM