I just did a new install with an 07 2.4 LE5 engine. It's now installed with a new tune into an 09 HHR (original engine was flex fuel 2.2 vvt LE8). I used the wiring harness from the 09 & everything converted over nicely. The only major change was that I had to solder the old style throttle body connector onto the 09 harness. Exhaust system is the larger 2.5" diameter now.
For a tune I basically copied & pasted most of the 07 tune into the 09 ECM, although I wanted to keep flex fuel so I copied the flex-fuel related tables from a 2010 2.4. I'm using the maf sensor with the original intake from the 09, but the MAF calibration table was identical between both.
Engine is running great at higher engine speeds but at idle or slow speeds it's doing some major surging. When I unplug the maf sensor the surging issue goes away. Can someone take a look at my tune & two logs (maf plugged in & maf unplugged) to see what might be wrong?
Thanks!
09 hhr joel 2.4.hpt09 hhr 2.4 MAF closed loop idle.hpl09 hhr 2.4 MAF fail closed loop idle.hpl