General & Model Specific Technical Forums > Twin Cam
Head Temp Sensor
rbabos:
--- Quote from: FLTRI on Sunday, August 05, 2012. 11:47:08 AM. ---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
--- End quote ---
iclicks bike is an 07 not FBW . I wish it was as simple as the text book default to rich. This problem is temp specific and intermittant. I've run two iat's ,tb and remote and the condition remains. I think it can be ruled out as the source of the problem.
Ron
iclick:
--- Quote from: rbabos on Sunday, August 05, 2012. 06:32:59 PM. ---iclicks bike is an 07 not FBW . I wish it was as simple as the text book default to rich. This problem is temp specific and intermittant. I've run two iat's ,tb and remote and the condition remains. I think it can be ruled out as the source of the problem.
--- End quote ---
Let's assume the ET (FCHT) sensor is faulty at a given temperature range, say 100-120°F, and triggers this syndrome. If it is reporting a false temperature at that time, like 32°, I could see the idle being high and AFR's rich. When it happens again with me I'll check ET, which should be telling if the ET sensor is the culprit. If the reading looks normal I would think it could be ruled out, at least in my case. I'm still perplexed about why TP is showing at ~6% at idle when this happens, as if the cable is snagged somewhere. It can't be, as twisting the throttle doesn't help and restarting resets everything back to normal.
rbabos:
--- Quote from: iclick on Monday, August 06, 2012. 12:35:39 PM. ---
--- Quote from: rbabos on Sunday, August 05, 2012. 06:32:59 PM. ---iclicks bike is an 07 not FBW . I wish it was as simple as the text book default to rich. This problem is temp specific and intermittant. I've run two iat's ,tb and remote and the condition remains. I think it can be ruled out as the source of the problem.
--- End quote ---
Let's assume the ET (FCHT) sensor is faulty at a given temperature range, say 100-120°F, and triggers this syndrome. If it is reporting a false temperature at that time, like 32°, I could see the idle being high and AFR's rich. When it happens again with me I'll check ET, which should be telling if the ET sensor is the culprit. If the reading looks normal I would think it could be ruled out, at least in my case. I'm still perplexed about why TP is showing at ~6% at idle when this happens, as if the cable is snagged somewhere. It can't be, as twisting the throttle doesn't help and restarting resets everything back to normal.
--- End quote ---
Sounds like your problem area is more within the throttle mechanism, shaft or the actual tps sensor itself. Sounds like something hanging up or faulty within the tps. If you shut down at 6%, when you restart the ecm likely resets to 0. What will be totally wrong is the tps volts will be way high in this case. Curious, what is your tps volts reading at 6% and after recycling the ignition to 0 ?
Ron
iclick:
Mine hit the high-idle, rich AFR (~.70 Lambda) syndrome again today after a warm restart. This is beginning to crop up about once per week now. The ET showed 169°, which lends me to believe my problem isn't with the ET (FCHT) sensor since it is showing a predictable and reasonable value after a 15 min. cool-down from hot. Thus, it's back to the drawing board for me, which makes me lean toward the TPS again as the prime suspect. OTOH, what about the MAP sensor?
FLTRI:
--- Quote from: iclick on Saturday, August 11, 2012. 01:51:41 PM. ---...makes me lean toward the TPS again as the prime suspect. OTOH, what about the MAP sensor?
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High idle is from the IAC. It can get carboned up causing stickage.
How bout IAT? It will default to cold run when bad.
Map sensor prolly not the cause of temperature affected high idle.
Just my $.02,
Bob
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