Rafael
GT Reference
Well, now that my buddy took the big plunge and bought a Stelvio, I get to use his Quota for any dirt road trips until he sells it.
In preparation for a trip to Utah next September, I took it out for a spin. Checked the gas mileage and found that it was a measly 27 mpg. He got mid 30's 2 years ago. We've recently (not may miles ago) tuned it ; adjusted the valves and balanced the notorious throttle body. Anyway, we hooked up the VDSTS and found that the TPS figure behaved normally with the ignition on and engine off. But when the engine is running the reading drops initially then, seem to get stuck, then rise to a figure that's most likely too high. The bike seems to run okay though, it's cold blooded and its a little jerky the way it was before the PC III usb was installed. The right spark plug color seems normal and the left reads rich. I figured that might be from the imbalanced idle setting. The idle imbalance is due to the closed the air bypass per MPH recommendation.
Also found the following historic diagnostic trouble codes:
Throttle Position Sensor: short circuit to battery.
Battery volt: open / short circuit to battery.
Fuel Pump Relay: open / short circuit to battery.
There are no current trouble codes.
It seems to me to be a bad connection to the TPS that is exacerbated by the motor vibration.
I checked the price of the TPS at a dealer... $330US! I think I'll try cleaning it and checking the wires and connector for a defect. Also, searched Weber PF 10 and found that a V6 Maserati motor used the same TPS, wish it was a Fiat... who knows the Maserati part may be cheaper.
Any help would be appreciated.
In preparation for a trip to Utah next September, I took it out for a spin. Checked the gas mileage and found that it was a measly 27 mpg. He got mid 30's 2 years ago. We've recently (not may miles ago) tuned it ; adjusted the valves and balanced the notorious throttle body. Anyway, we hooked up the VDSTS and found that the TPS figure behaved normally with the ignition on and engine off. But when the engine is running the reading drops initially then, seem to get stuck, then rise to a figure that's most likely too high. The bike seems to run okay though, it's cold blooded and its a little jerky the way it was before the PC III usb was installed. The right spark plug color seems normal and the left reads rich. I figured that might be from the imbalanced idle setting. The idle imbalance is due to the closed the air bypass per MPH recommendation.
Also found the following historic diagnostic trouble codes:
Throttle Position Sensor: short circuit to battery.
Battery volt: open / short circuit to battery.
Fuel Pump Relay: open / short circuit to battery.
There are no current trouble codes.
It seems to me to be a bad connection to the TPS that is exacerbated by the motor vibration.
I checked the price of the TPS at a dealer... $330US! I think I'll try cleaning it and checking the wires and connector for a defect. Also, searched Weber PF 10 and found that a V6 Maserati motor used the same TPS, wish it was a Fiat... who knows the Maserati part may be cheaper.
Any help would be appreciated.