Bryan28

So I finally got my Torquer V2 cam and really nice lloyd elliot stage 2 243's and now my C5 FRC will not hold idle. It will start, rev to about 1400, drop down to 1000 for a few seconds then try to find idle, and then it will slowly start to surge little by little till it surges to low and dies. Its throwing PO101 maf sensor code. I have HP tuners and had some tuning done when I put the LS6 manifold on and LG Super Pro longtubes and off road pipes. Any help will be appreciated. I had my neighbor come and spray around the intake and see if I had a vacuum leak but it didn't respond to carb spray. My Maf needle gauge only goes to about 2-3. If I open the throttle to about 1300 it will run.

Any ideas?

Bryan

AdsoYo

iTrader: (1)

What happens when you disable MAF and run SD?

What do your LTIT and STIT's look like? May also be a base airflow problem.

madmike9396

iTrader: (29)

off topic but what does those heads flow ?

Bryan28

I don't know but the portwork and milling are beautiful! He's a good guy and the price was below other shops.

Bryan28

I can try it, what should I look for when I unplug it?

redbird555

iTrader: (14)

when its un plugged the car should smooth out and idle. that would indicate a problem with the maf circuit

redtan

iTrader: (5)

Wait so you're saying that the car initially had a tune for basic bolt-ons but have done nothing to said tune after putting in ported heads and a healthy cam?

Bryan28

I've got it retuned, but my IAT sensor had shorted out at the pigtail connector, so the car was thinking it was -39 degrees. Fixed that. Now no codes and it does run better. A new problem, I bought a used NOS universal efi kit, and the fuel solenoid is leaking with the system turned off, car has became hard to start after sitting for 10-15 minutes, plus as car is running with the system not on, if fuel is dribbling into the air bridge before the TB and after the MAF via the nos nozzle that could be causing more problems... I will sometime today take apart that solenoid and see if its dirty..