Quote:
Originally Posted by solidsnake11
OP please update the fix to help others.
Thank you.
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I haven't fixed it yet. I'm planning on swapping back to the OEM headers on Saturday when I have some time and seeing if it fixes it.
That said, I had to drive the car to work today and I noticed something very interesting.
Under very light throttle and low rpm, the LTFT is sky high as I've shown in the previous log (over 35% sometimes). I've been driving it like this for the past few days to avoid damaging something but today I had to give it some gas and get it to the higher RPM to make a merge and I noticed that at around 4500rpm and beyond, both LTFT and STFT would drop to 0 and stay there as long as I was on the accelerator. I suspect 4500rpm is where the system transitions from PI to DI and there's a noticeable hiccup/blip/lack of acceleration for a split second before the car starts accelerating again and LTFT and STFT both drop to 0.
Essentially, below 4500rpm LTFT is very high and the engine is probably using PI. Past 4500rpm it uses DI and fuel trims are perfect (so is AFR). There is also a small noticeable transition between these two modes noticed as a momentary lack in acceleration.
I didn't have my OFT plugged in to log, but I did have the torque app for monitoring and I was able to get some data logs with that. The resolution is low but it shows exactly what I mean:
https://datazap.me/u/rb28dett/nov-21...a=3-5&mark=153 . Every time you see LTFT drop down to 0 was when the engine had crossed past 4500RPM.
I've linked it to an area where I could be above 4500rpm for a (very) short period of time due to traffic.
Question is whether this behavior is because of the wrong header for the tune or if there is something going on with my injectors/fuelling.