Troubles with TPS

oakville

.020 Over
Joined
Mar 16, 2011
Messages
41
Location
Oakville, ON
I have been having problems with stumbling ar low throttle positions. Figured it was a TPS. Tested and adjusted and things got better only to get worse again over time. Checked everything including all connections and pinching of wiring harness and again all seemed good. Things got worse again. Removed TPS today as it was variably getting better then worse then better and decided it must be wet. I was right it was soaked. Not with water though. Gas. The TPS was soaked with gas. This was causing it to read incorrectly and the ecu was fueling incorrectly. I reinserted the TPS after letting it air out for 2 hours and filled it with dielectric grease to try and prevent this from happening again.

Can anyone think of a reason for the gas filling up the TPS? I can't see where it might have come from.
Any assistance is appreciated.
 
Not sure those would do it since the TPS is well sealed from the outside. It appears to have come from the inside of the throttle body but there are no fuel lines or places for it to leak in through. I will tell you that drying it out and using the dielectric grease seems to have fixed the problem. Time will tell and after my ride of 2,100 km this weekend i will know if it is a good fix. The dielectric grease is silicone based and immune to gasoline so it will prevent infiltration.
 
can you give a bit more detail on the low throttle position stumbling?
 
I have a scanguage mounted on the bike so that is where I was able to observe the random fluctuations in tps percentage. The stumble would follow along with the tps percentage changing and could result in a surge or a massive bang from the exhaust. Also on acceleration it was very rough unless you were hard on the throttle (I know that can be mocked).

The solution was to remove the sensor and let it dry out. I then filled the sensors cavity with dielectric grease. Gas will not dissolve it. Since the adaption reset through tune ecu it has been running perfectly and the guage shows no fluctuations in the tps percentage. This was a long process to diagnose and then clear up but a lot cheaper than a new tps which would have fixed it immediately but I do not know if it would reoccur withou the grease barrier. I just hope that this might prove useful to someone suffering similar issues and all it might be is a wet tps.
 
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