General & Model Specific Technical Forums > Twin Cam
Head Temp Sensor
ViennaHog:
If you see 6% tps at idle, change your tps or check for a broken butterfly shaft.
iclick:
--- Quote from: FLTRI on Saturday, August 11, 2012. 06:45:20 PM. ---High idle is from the IAC. It can get carboned up causing stickage.
--- End quote ---
I did clean it out after the first incident, but it continues. This is the bike's second IAC, replaced last spring. Anyway, I don't see how the IAC allowing more air to bypass the butterfly would cause TP to show >0%. The butterfly should be in the same position and show 0% at idle.
--- Quote ---How bout IAT? It will default to cold run when bad.
--- End quote ---
I can monitor IAT with the Power Vision, so I'll set that up as the next test.
--- Quote ---Map sensor prolly not the cause of temperature affected high idle.
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I wouldn't suspect it too seriously either, but at this point in time I'm still in the guessing stage.
rbabos:
Iat will only richen and not change the idle speed. Whole mess of math crap going on within the ECM so it's quite possible if the tps is not 0 there could be some effect to the iac warmup points or even the head temp table. At 6% the iac will be whacko. Seems some tables are interconnected to some extent. Quite sure if you can find the cause of the 6% tps idle and cure that, the rest should fall into place. Make sure the tps volts matches the value in a previous log where the engine was running correctly. The % and volts follow each other.
Ron
FLTRI:
--- Quote from: rbabos on Sunday, August 05, 2012. 09:36:05 AM. ---Tps volts ranged from .53 to .61, depending on where the blade was set or where I adjusted the tps sensor to.
Ron
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How did you adjust the stock Delphi EFI sensor?
Bob
rbabos:
--- Quote from: FLTRI on Sunday, August 12, 2012. 05:19:52 PM. ---
--- Quote from: rbabos on Sunday, August 05, 2012. 09:36:05 AM. ---Tps volts ranged from .53 to .61, depending on where the blade was set or where I adjusted the tps sensor to.
Ron
--- End quote ---
How did you adjust the stock Delphi EFI sensor?
Bob
--- End quote ---
Locating tit needs to be nipped off the face of the tps sensor, then the mounting holes dremelled into a slot shape. Once blade opening is set to provide mid 20s iac points at normal operating temp, I then rotated the tps to give the volts I wanted, snugged screws and rechecked value in datamaster. For some reason the components I used put it out of spec and even with a fully closed throttle plate I could only get to .64 volts. That's why I had to modify it. It's now at .53, using the 55HPI.
Normally none of this should be needed on a stock tb and stock tps since all that needs to be done is adjust the blade opening until you are in the correct tps range when viewing datamaster or whatever program will allow this data to be viewed.
Ron
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