BigRedWeather
Full Access Member
The Throttle Position Sensor (some call it the Pedal Position Sensor) attaches to the fuel pedal assembly. When the pedal is depressed the interior of the TPS/PPS turns which in turn signals for more fuel to the engine. Every 6 months for 8 years I have had to replace the PPS because it does this:
when the pedal is depressed enough to run the engine at about 1200 RPM the signal to the engine drops to idle RPM, so as I slowly depress the pedal the engine speed goes from idle to 600, 800, 1000, idle, 1400, 1600 etc. The RPMs in bold and underlined are very rough as the truck lurches forward. Sometimes the lurching make my foot on the pedal go up and down which makes the lurching even worse. Probably half of the time the increase in RPMs is smooth from idle to 2200 with no lurching.
When I put a new PPS ($50.00 for a Dorman PN699-200 or 200-699) the problem goes away for 6 months, then it returns again. I think my truck must be putting some current to the PPS that it is not designed for and therefore is damaging it. My current problem is that the last PPS I put on only worked well FOR 3 WEEKS. At that rate it could be pretty expensive to drive this truck.
-Does anyone else have this problem?
-Is there another PPS that would fix this problem permanently?
Thanks for the input,
BigRedWeather
when the pedal is depressed enough to run the engine at about 1200 RPM the signal to the engine drops to idle RPM, so as I slowly depress the pedal the engine speed goes from idle to 600, 800, 1000, idle, 1400, 1600 etc. The RPMs in bold and underlined are very rough as the truck lurches forward. Sometimes the lurching make my foot on the pedal go up and down which makes the lurching even worse. Probably half of the time the increase in RPMs is smooth from idle to 2200 with no lurching.
When I put a new PPS ($50.00 for a Dorman PN699-200 or 200-699) the problem goes away for 6 months, then it returns again. I think my truck must be putting some current to the PPS that it is not designed for and therefore is damaging it. My current problem is that the last PPS I put on only worked well FOR 3 WEEKS. At that rate it could be pretty expensive to drive this truck.
-Does anyone else have this problem?
-Is there another PPS that would fix this problem permanently?
Thanks for the input,
BigRedWeather