Julien Scherer

I have a freshly rebuild LHU in my 2010 SS and I put a stock gms1 tune on for the break-in in the car with LNF injectors instead of the Opel injectors I have. It's only temporary but i'm having random misfires on all cylinders like higher than usual (around 15 to 30 on each after a 60 miles ride instead of 1 or 2 on each) and when I do pulls, the afr is very rich (11-10 afr) around 5k rpm espicially on 3rd and 4th gear.

I can feel the lack of power at that exact rpm, the noise of the engine changes like it runs on 3 cylinders or less and the car gives a little knock just like if I was touching the brake pedal.

I'm starting to wonder if the gms1 tune isn't suit for the LHU? Can someone enlighten me about that? Is the compression ratio the same on both LNF and LHU too? Thanks in advance for the answers

exninja

iTrader: (1)

I have an ldk with lnf injectors and zero issues (other than a mild vibe at idle). I had both stock and gms1 calibration files. It's not the tune itself causing your issues. Do you have the correct map sensor settings?

Julien Scherer