Help - Loss of Power / No Engine Light?

[Jamestl]

Originally Posted by steve99

Ok at tom brz said the intake cam is either bad or the logging is no good.


The aft is rich but ive seen that especially on oft v2 tunes


I dont think its exhasit leak as the LTFT long term fiel trims are ok especially at low rpm, for exhasit leak id expect to see +15% or more.


The rich afr is at higher rpm not usually effected much by exhasut leaks.


Can you flash an oft v4 tune to car as that does log vvt cams correctly.


Im suspecting cam issue, especially if you already have V4 oft tune flashed.


Also update oft and install latest template file from opt support site.


None of this will fix issue, but if you log again on oft V4 tune then will confirm if its cam issue

Thanks, Steve. I will update the tunes/OFT. Now it's the summer, I'm actually thinking of flashing an E85 tune for the summer just to see how it feels. Hard to turn down free horsepower!!

[Jamestl]

Originally Posted by tomm.brz

glad was helpfull

log is perfect now, enjoy it

Thank you again!

[tomm.brz]

was pretty sure it was a small leak, anyway i said is perfext but meant that s problems' free but it s really really rich on open loop, you could lean a bit for more power and less fuel consumption

delete vvt int exh from logs and put also maf voltage so could help more if you ar3 willing to modify it with romraider

[Jamestl]

Originally Posted by tomm.brz

was pretty sure it was a small leak, anyway i said is perfext but meant that s problems' free but it s really really rich on open loop, you could lean a bit for more power and less fuel consumption

delete vvt int exh from logs and put also maf voltage so could help more if you ar3 willing to modify it with romraider

I think I'm going to flash to the updated OTS tune and leave it. Not sure I trust myself to do brain surgery on the car!

[tomm.brz]

v4 has also leaner commanded afr, coul be better then, yes

[Jamestl]

Well... looks like the issue has returned, though not sure where. I re-clamped the V-band connection and there was no outside gap (before or after). I then re-logged the car and data link is below. Similar symptom so I'll start checking the exhaust system. Can anyone see something different from before from the data? I tried doing this myself but nothing seems that out of ordinary outside of some knock / flkc.

https://datazap.me/u/james-li/data?log=0&data=1-5-10

[tomm.brz]

well, if it got better when u clamped it, and now it came back and ltft went more positive than before, i would check and fix the exhaust.
Also check it s not hitting anywhere, like overpipe against the body
Also, you re playing with fire throwing those -4 flkc at high rpm

[Jamestl]

I don’t know how to test for lack of power without WOT. The car seems ok at 20% throttle. Is there another way?

Also I switched to e85 two tanks ago so maybe that’s part of the issue? Gonna try to burn off the rest of it and go back to 93. The weird thing is that the car is fine when engine is cold ish but after a bit of warmup it loses power.

[tomm.brz]

Didn t got that you have e85, well ltft monitor that doesn t count much anymore
Don t know

[Lantanafrs2]

Intake manifold 0 rings?

[Jamestl]

It was the cat. Totally gone. Was basically rattling in the housing. Took it out and now back to normal. I guess when it rains it pours. The car was dead reliable for 2 years, then the recall started a chain event.

Thanks again folks!!