Scotty,
I appreciate your responses and interest and wanted to update you as breifly but as informatively as possible. The truck still continues to lose power as previously described but not as it was initially doing. Almost everything on the truck has been repalced and everything is a dead end. Here is what is definitely becoming a 5000 lb. driveway ornament. I hope you may come up with a suggestion. There are still no codes or cel to give any help. I spoke with the mechanic yeaterday and he told me he has disconnected the aftermarket cruise control with no improvement. I didn't really understand him as he explained that the O2 sensors were heating up and that was unusual for this time of year as it is very warm where I live (Southwest GA). He also said he was puzzled as the truck ran impressively when it would run but it would lose power and then cathch back up and run smoothly until it would do it again and the vehicle was a hazard to drive and unsafe for the road as it stands now. In the list below the following parts have been replaced or checked with no solution to the power loss problem. Alternator Battery Fuel Filter Fuel Pump (gasoline that was in the tank when problem began) Catalytic Converters Crankshaft Position Sensor Camshaft Position Sensor Throttle Position Sensor Throttle Body checked and cleaned and Idle Air Control Valve Coil Pack Ground Checked (Status OK) Cylinder Compression Checked (Status OK) Spark Plugs Checked No Known Vacuum Leaks MAS Sensor (Cleaned Checked & OK) Fuel Lines Checked & Fuel Pressure is Normal (even when power loss occurs). Hope that something comes to mind and your advice will help me get my truck running again. Best Regards, Charlie

Comments
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ckmkmm96
ckmkmm96

OK... I may have misunderstood what he was trying to explain However, I don't know of anything else to check or replace as I think about everything has been replaced and nothing seems to do any good or cause the pcm to give a code. Wish I could bring the truck to you but Texas is 1000 miles from south GA. Thanks for all your help, maybe all will turn out better. I guess I'm just so disheartened and at a loss. Best Regards Scotty, Charlie

ScottyKilmer
ScottyKilmer

Editor

I would start with another mechanic myself, as ALL oxygen sensors heat up automatically via the computer whenever the engine is started up, it has nothing to do with outside temp. Guy doesn't seem to know much about those systems so start with a better mechanic . Me, I would hook up my dealer level scan tool, road test it until it acted up, then would analyze the live and mode 6 data recorded during that failure event.