wtf is with the tps? hesitation?
04-09-10, 11:02 AM
#1
wtf is with the tps? hesitation?
s4 tps
ok so if your hesitating at 3000 rpm its most likely the tps, once you rule most other things out of course...
so why does the tps cause hesitation at 3000 rpm if its not even touching the throttle at WOT
tps only touches the throttle for a portion of the throttle not all the way to WOT like the s5 tps does.
so why, under WOT does the tps adjustment have anything to do with wot 3000rpm hesitation?? if the tps is all the way out and not touching the throttle at all?!?
ok so if your hesitating at 3000 rpm its most likely the tps, once you rule most other things out of course...
so why does the tps cause hesitation at 3000 rpm if its not even touching the throttle at WOT
tps only touches the throttle for a portion of the throttle not all the way to WOT like the s5 tps does.
so why, under WOT does the tps adjustment have anything to do with wot 3000rpm hesitation?? if the tps is all the way out and not touching the throttle at all?!?
04-09-10, 12:03 PM
#2
MECP Certified Installer
I am not an S4 expert, I don't even own one but...
Based on my experience with the S5, even though the plunger is extended all the way, it is still giving the ECU a voltage value. Your TPS is just a fancy, linear potentiometer. Its resistance increases as it extends. Pots (potentiometers) tend to wear out in locations where the contacts make frequent contact. For example, alot of S5 narrow range TPS's will wear out and provide extremely high resistance at half travel or at full extension, causing issues.
Break out your DMM or preferably, an analog ohm meter and test the resistance of the TPS across its sweep. I bet you'd find an abnormally high resistance at full extension, or less likely, but possibly, a shorting condition (low resistance) at full extension.
Does that answer your question? I don't know you if you are having a 3000rpm problem or not, but hopefully that explains the methodology of diagnosis and common issues.
Based on my experience with the S5, even though the plunger is extended all the way, it is still giving the ECU a voltage value. Your TPS is just a fancy, linear potentiometer. Its resistance increases as it extends. Pots (potentiometers) tend to wear out in locations where the contacts make frequent contact. For example, alot of S5 narrow range TPS's will wear out and provide extremely high resistance at half travel or at full extension, causing issues.
Break out your DMM or preferably, an analog ohm meter and test the resistance of the TPS across its sweep. I bet you'd find an abnormally high resistance at full extension, or less likely, but possibly, a shorting condition (low resistance) at full extension.
Does that answer your question? I don't know you if you are having a 3000rpm problem or not, but hopefully that explains the methodology of diagnosis and common issues.
04-09-10, 12:16 PM
#3
I think you answered your own question... which is.. it's not? if i had drove my FC instead of the FB today, i'd go phyiscally look to see at what position the tps is no longer touching. but if had to guess off memory.. it's somewere around 60-75 percent of throttle. do you have your 3000 rpm injector staging set on your r-tek by chance jess
04-09-10, 02:14 PM
#4
HAILERS
Join Date: May 2001
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Series four TPS is fully extended at JUST the same time the secondary throttle plates START to open. Like waaaaaay before anybody ever reaches 3000 or 3800 rpm. IF memory serves, the manual says the secondarys open at approx 18* pla. Ain't much at all.
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