BT 20V TPS tuning
Posted: Sat Dec 23, 2023 7:13 am
Hiya, I'm trying to get my BT engine running as best as it can in my AE86. It's on a stock A/T ECU right now (was running a HKS piggyback but I removed it) and it has a bit of a "wall of hesitation" around 2k-3k rpms with wide throttle applied. I'm wanting to check my TPS has the right readings, it looks slightly like it's been moved by someone before.
I tried following the FSM for this, but there is no IDL wire on my TPS harness, and that's most of what you need to check with the FSM. Is this uncommon/an issue? I found someone saying the blacktop ECU doesn't have an idle switch on another thread.
Currently, with a multimeter hooked up set to 2k ohms reading and with the negative/COM wire on the E2 pin of the TPS unit, I only get a reading if I touch the positive end of the multimeter to the VTA pin.
Now with the car off - no feeler gauge put anywhere (I'm not exactly sure WHERE to put one, but I think I can under TB #1's stop lever underneath the ITB assembly), I get a reading of 0.6, and if I gradually open the throttle a bit then it will increase to 2~ until hitting infinite resistance i.e the 1. reading.
Am I on the right track here for this? I've seen in videos with 16v 4ages that people try to get the TPS to the exact spot where there resistance hits infinity with a feeler gauge under the throttle stop. I'm not sure if this same method applies for the 20vs with ITBs or not.
Thank you for any insight
I tried following the FSM for this, but there is no IDL wire on my TPS harness, and that's most of what you need to check with the FSM. Is this uncommon/an issue? I found someone saying the blacktop ECU doesn't have an idle switch on another thread.
Currently, with a multimeter hooked up set to 2k ohms reading and with the negative/COM wire on the E2 pin of the TPS unit, I only get a reading if I touch the positive end of the multimeter to the VTA pin.
Now with the car off - no feeler gauge put anywhere (I'm not exactly sure WHERE to put one, but I think I can under TB #1's stop lever underneath the ITB assembly), I get a reading of 0.6, and if I gradually open the throttle a bit then it will increase to 2~ until hitting infinite resistance i.e the 1. reading.
Am I on the right track here for this? I've seen in videos with 16v 4ages that people try to get the TPS to the exact spot where there resistance hits infinity with a feeler gauge under the throttle stop. I'm not sure if this same method applies for the 20vs with ITBs or not.
Thank you for any insight