LS Engine Idling Issue

[ItDoRun]

Finally got my car started (after 8 years of building) but it won't idle at all. I have to feather the pedal to keep it running. Also noticed my volt meter on my New Vintage gauges is only showing 8 volts when running. Fan 1 comes on in the key on position. Let's start with the idling issue first though. I do know hat PSI programmed my ECM for the wrong style MAF. Would that be causing the issue? I talked to Gary at PSI this morning and he said the car would still run like it is.

2008 6.0L short block
LS3 heads
LS3 Intake
Custom cam/springs
Stock valve train

Ok, where do I start with the idling issue?

[Vega$69]

Check the port on the drivers side of the intake just behind TB. Should be plugged

[ItDoRun]

Originally Posted by Vega$69

Check the port on the drivers side of the intake just behind TB. Should be plugged

It's capped.

[ItDoRun]

How does the voltage play into this? Or does it make that big of a difference?

[Vega$69]

I would 1st look for vacuum leaks and open ports on the intake. Ports on the rear for the booster etc. also check that TB and O ring are snug.

Is the MAF sensor installed?

What have you done regarding tuning for you set up?

[ItDoRun]

Originally Posted by Vega$69

I would 1st look for vacuum leaks and open ports on the intake. Ports on the rear for the booster etc. also check that TB and O ring are snug.

Is the MAF sensor installed?

What have you done regarding tuning for you set up?

I checked all the vacuum/PCV hoses and they're all tight. I'll check the TBthis evening. Yes, MAF is installed. PSI did a start up tune when I purchased the ECM.

[ItDoRun]

I need to get a fuel pressure gauge installed. I'm sure there's probably some air in the fuel system as well.

[TomM]

The 8 volt thing is a problem. Where did you pick up the wire to the gauge? Is your alternator charging when it is running? What is your battery voltage running and static?

These engines use a lot of power to run everything, it might just be this simple...

T,

[ItDoRun]

Originally Posted by TomM

The 8 volt thing is a problem. Where did you pick up the wire to the gauge? Is your alternator charging when it is running? What is your battery voltage running and static?

These engines use a lot of power to run everything, it might just be this simple...

T,

I need to check it this evening to see if it's charging or not.

[ItDoRun]

Originally Posted by TomM

The 8 volt thing is a problem. Where did you pick up the wire to the gauge?

T,

I tied it into the pink 12V wire from the instrument cluster wiring.