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Discussion Starter #1
So I have a jzx100 1jz vvti swapped into my s13, Everything is pretty much stock the cars running 11psi and j pipe is deleted. So the car ran great boosted normal then all a sudden one day it threw a CEL and would go flat 10.0 as soon as it got out of vacuum and started to build boost, I’m not sure what’s happened? I’ve driven it a few times since then and it seems when you first start it and go drive everything is how it should be afr is around 11/11.5 under boost no CEL but after 5-10 minutes the CEL throws and it goes back to 10.0 as soon as the car goes into boost it also feels extremely slow when the CEL comes on, Any advice or has anyone else ran into this?
 

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1987 Toyota Supra
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What are the codes?
 

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Discussion Starter #4
What are the codes?
I managed to scan the codes and I’m getting code 47,52 and 78. 47 is the TPS so I’m guessing that’s where my issue of rich afr in boost is coming from? And also causing the car to feel extremely slow
 

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1987 Toyota Supra
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Yeah. I'd fix the root cause of the codes first.
See what that does.
 
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