07 GT500 single idle surge after rev or when rolling

[Gerrot]

As stated, tune is going along great, minus the idle will surge once after you rev the engine, then return to normal. Any input? Thanks guys!

07 GT500 5.4 dohc BIULD SHEET
Fox lake ported heads. (Golf ball port) Bumpy
L and M engine cams. 640 lift Texas Mile cams and springs
MMR racing timing chain kit HD
Diamond pistions ceramic coated 9.6 to one
total seal rings
cometic racing head gaskets
Carrillo light weight rods good to 2000hp
Ford GT light weight crankshaft
ATI super damper balancer
26 psi boost
4.7 Kennie Bell
Gime 5 kennie bell air cleaner and tube
168 mm mono blade throttle body. 2150cfm
killer chiller A/C cooler for intercooler
Mcleod clutch and lighten steel flywheel. good to 1500hp
RPM stage 7 trans good to 2000 hp
1700cc ID injectors
return style fuel system
Fore fuel pump ,tripple 400cfm
1/2 in fuel line
E85 fuel
50 psi fuel pressure
Kook hi flow headers
3 in X pipe
mac hi flow mufflers

[Gerrot]

Anyone?

[bbrooks98]

It looks like it does it during the dashpot Idle speed control mode. Try adjusting the values in the Dashpot preposition lower.

[Devildog1325]

You need to take what your stit are telling you in your log and apply them to your airflow in the tune for idle airflow I saw Idle trims around 1.85lb/min at some points this will definitely cause hunting issue's.....if I'm reading your log right. I would put all your idle controls back to stock and work in your idle airflow tables before messing with anything else Also why did you increase your gain on your transient fuel but decrease your time constant. And look at your supercharger inlet pressure offset vs rpm, you have changed them but HP has something going on with the software the axis turned to 1000 rpms all the way down. Also why was your displacement decreased?

[Devildog1325]

And if you changed your cams you might want to adjust when your intake valve opens.

[Gerrot]

You need to take what your stit are telling you in your log and apply them to your airflow in the tune for idle airflow I saw Idle trims around 1.85lb/min at some points this will definitely cause hunting issue's.....if I'm reading your log right. I would put all your idle controls back to stock and work in your idle airflow tables before messing with anything else Also why did you increase your gain on your transient fuel but decrease your time constant. And look at your supercharger inlet pressure offset vs rpm, you have changed them but HP has something going on with the software the axis turned to 1000 rpms all the way down. Also why was your displacement decreased?

I am just trying to figure out the problem. Some one else tuned it and could not get this correct. I generally only tune GM stuff, but this is for a local shop owner. So you can't not help kind of thing! lol

I will look into that and report back! Thanks.

I did try adjusting the Preposition multiple times with no victory there.

[murfie]

fuel trims are showing its rich in the low airflow areas. Upper airflow shows lean spikes in fuel trims as it enters closed loop and fuel trims come back. That and your commanded indicates a lean condition.

Bank 1 is a little more rich at idle. That could indicate leaky fuel injectors. The lean condition with throttle would back up that guess. Either that or you need to fix your MAF values.