TPS Confusion : How does the idle system work
#1
TPS Confusion : How does the idle system work
I adjusted my TPS the other weekend. I drove the car around fine for a few days then one morning it wouldn't rev over 1500. I got out, popped the hood, and found out that I forgot to plug the TPS back in after adjusting it (go me...). I plugged it in and was good to go.
So here's my question: why would the car run fine for a few days then not go over 1500 the next?
The only thing that changed was the weather. On the day it didn't work it was probably about 10 deg. warmer. I don't have any emissions equipment (no thermowax either) so nothing would be affecting my idle otherwise.
Would an air temperature sensor (or something) affect things?
So here's my question: why would the car run fine for a few days then not go over 1500 the next?
The only thing that changed was the weather. On the day it didn't work it was probably about 10 deg. warmer. I don't have any emissions equipment (no thermowax either) so nothing would be affecting my idle otherwise.
Would an air temperature sensor (or something) affect things?
#6
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I might try with / without TPS plugged in just to make sure. I'm pretty sure the ECU fail-safes the TPS to either WOT or idle. If it's WOT, I imagine the engine would idle pretty badly, and if it's idle, anything but idle might have issues (possibly like you're seeing).
The IAT sensor in the AFM could have a bearing there (I believe it's used to determine incoming air mass), but somehow I don't think 10 degrees would change things that much!
The IAT sensor in the AFM could have a bearing there (I believe it's used to determine incoming air mass), but somehow I don't think 10 degrees would change things that much!
#7
Originally Posted by stevej88na
I might try with / without TPS plugged in just to make sure. I'm pretty sure the ECU fail-safes the TPS to either WOT or idle. If it's WOT, I imagine the engine would idle pretty badly, and if it's idle, anything but idle might have issues (possibly like you're seeing).
The IAT sensor in the AFM could have a bearing there (I believe it's used to determine incoming air mass), but somehow I don't think 10 degrees would change things that much!
The IAT sensor in the AFM could have a bearing there (I believe it's used to determine incoming air mass), but somehow I don't think 10 degrees would change things that much!
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