Seems people are having a lot of TPS issues lately, so I'm throwing this out there.
I have an intermittent power loss problem that I and several shops have been unable to diagnose. The power loss is constant during the cold months and intermittent during the summer months. Mileage went down from about 17-18 to 13-14 miles to the gallon, and pulling small hills on the highway can be a problem. It's "seat-of-the-pants" noticeable.
All sensors except for the TPS and MAT (on intake) have been replaced. When I checked the TPS voltage using my cheap DMM it was just a hair out of tolerance (IIRC, it read ~190 mV when throttle fully closed). It read good with throttle fully open. I wonder if the TPS could even cause a power loss problem.
Three shops, including a dealership, watched all the sensors function while hooked up to an analyzer/computer and said everything was operating within tolerances. My emissions test came out great, so I can assume, at least to some degree, that compression is good.
I'm open to other ideas to check for this problem. What I've done: new wires, plugs, cap & rotor, fuel filter, fluids changed, vac lines replaced, rebuilt head, welded up exh. manifold cracks, checked fuel pressure, cat replaced, and a few other things I can't think of. Currently no codes flagged.
If your advice leads to a fix, I will buy you a beer, soda, or whatever you drink.
Thanks
I have an intermittent power loss problem that I and several shops have been unable to diagnose. The power loss is constant during the cold months and intermittent during the summer months. Mileage went down from about 17-18 to 13-14 miles to the gallon, and pulling small hills on the highway can be a problem. It's "seat-of-the-pants" noticeable.
All sensors except for the TPS and MAT (on intake) have been replaced. When I checked the TPS voltage using my cheap DMM it was just a hair out of tolerance (IIRC, it read ~190 mV when throttle fully closed). It read good with throttle fully open. I wonder if the TPS could even cause a power loss problem.
Three shops, including a dealership, watched all the sensors function while hooked up to an analyzer/computer and said everything was operating within tolerances. My emissions test came out great, so I can assume, at least to some degree, that compression is good.
I'm open to other ideas to check for this problem. What I've done: new wires, plugs, cap & rotor, fuel filter, fluids changed, vac lines replaced, rebuilt head, welded up exh. manifold cracks, checked fuel pressure, cat replaced, and a few other things I can't think of. Currently no codes flagged.
If your advice leads to a fix, I will buy you a beer, soda, or whatever you drink.
Thanks