General & Model Specific Technical Forums > Twin Cam
Head Temp Sensor
rbabos:
--- Quote from: JBarrettB on Sunday, August 05, 2012. 09:43:38 AM. ---A rise in or an erratic idle when the engine is warm tends to make me think temp sensor. Still in range but bouncing around causing issues. Seem to be pron to failure in my experience.
JB
--- End quote ---
I'm hoping its as simple a fix as that. This sensor is from the stock 07 96" and it has been baked to death since I ran it bone stock for the first season. Even when stock it would act weird sometimes with jumping to high idle on a mid temp restart. Never thought much of it back then figuring it was just how HD did the calibration since the rest of the tune was pretty phucked up too. Wish I could remember if it was from day one or not but I'm starting to think it developed later in the first season.
Ron
iclick:
--- Quote from: rigidthumper on Saturday, August 04, 2012. 09:23:07 PM. ---A broken throttle shaft is about the only time I see TPS>0 when at idle on cable drive TBs. I have seen erratic TPSs where they have a 'blip' when steady rolling throttle open.
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Back when I was having problems with the original TPS it would show odd TP values, like 15% at idle, etc. That was when it really started acting goofy by misfiring and high idle as well as throwing TPS codes. I replaced it in June 2011 and the problems disappeared--at least until this weirdness lately.
As for seeing ~6% TP at idle, I thought the ECM got all TP info from the TPS. IOW, it doesn't reset anything when started but sees whatever the TPS reports.
rbabos:
--- Quote from: iclick on Sunday, August 05, 2012. 10:38:15 AM. ---
--- Quote from: rigidthumper on Saturday, August 04, 2012. 09:23:07 PM. ---A broken throttle shaft is about the only time I see TPS>0 when at idle on cable drive TBs. I have seen erratic TPSs where they have a 'blip' when steady rolling throttle open.
--- End quote ---
Back when I was having problems with the original TPS it would show odd TP values, like 15% at idle, etc. That was when it really started acting goofy by misfiring and high idle as well as throwing TPS codes. I replaced it in June 2011 and the problems disappeared--at least until this weirdness lately.
As for seeing ~6% TP at idle, I though the ECM got all TP info from the TPS. IOW, it doesn't reset anything when started but sees whatever the TPS reports.
--- End quote ---
In order to use the calibration the tps has to be at 0% with the correct tps volts with a cable operated tb. The ecm sets this 0 position on a closed throttle so the calibration can use the 0% ve table for startup and idle. If you have 6% showing, that's where it's taking fuel from in the ve table at idle. That ain't right.
Ron
FLTRI:
Cable operated bikes will show 0% TP.
FBW bikes will show approx 5% TP.
If an engine temp sensor (temp and/or iat) go bad, there are typically low reading(s) that will cause system default "cold start" behavior...ie: high idle/rich running.
HTH,
Bob
fleetmechanic:
On the ones we've had with high idle or fouled plugs due to a failed ETS the Scanalyzer has indicated "ET Sensor Open/High".
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