Plug Gap

[stangr5oh]

no it won't. The tune is programmed. You would have to plug up to the ECM and reprogram back to stock or any tune modification.

 

[Paul1981610]

That's what I thought. This whole thing is insane. Runs good until I pull MAF and put plugs in.

 

[Kilgore Trout]

It almost sounds to me like a problem with the boost bypass valve or its solenoid:
http://www.rpmoutlet.com/boost-bypass-svt-cobra-mustang.htm?pagename=boost bypassc

 

[Paul1981610]

What exactly is this. That URL is not working

 

[Kilgore Trout]

What is a boost bypass valve?

The bypass valve is integrated in the supercharging system. When low engine power is required, the bypass allows air to enter the engine without passing through the supercharger. The supercharger bypass valve operates in the following manner:

• Under normal engine operating condition vacuum is supplied to the bypass valve. The valve opens, diverting excess airflow back into the air plenum. This prevents the supercharger from “cavitating.”
  1. Cavitating causes reduced performance, increased temperature, and poor fuel economy.
• At high engine demands, vacuum is removed from the bypass valve causing it to close. This directs all airflow from the supercharger to the intake manifold.
• The supercharger boost (SCB) solenoid is used to control intake manifold vacuum to the vacuum bypass actuator. The PCM transmits an output signal to the SCB solenoid, which activates the solenoid to bypass vacuum when the engine is under maximum boost, reducing the boost pressure by up to 3 PSI.

 

[Paul1981610]

The vacuum operated bypass valve is working. There is no electrical solenoid on this setup

 

[Kilgore Trout]

Well, anyways I sure hope ya get it figured out man.

 

[Paul1981610]

Could belt slippage do this. I'm buying a freaking boost gauge this weekend to solve so e of these questions. But slipping =no boost could that equal rich condition

 

[Kilgore Trout]

Well I dunno man you are buying a lot of stuff, it might be more cost effective to take it to a good shop and just have them diagnose it.

 

[Paul1981610]

This is how rich it is.
After cleaning a MAF
I'm calling it quits