How to tell if your car has a custom tune

[GaryZ]

My new 2004 Mach 1 is idling at about 1100 rpm and does burn the the tires 1 -3rd, so what gives? Is it tuned? Nastiest 4.6 I ever saw..., and that's after sitting in a field for 5 years.

 

[01yellercobra]

My new 2004 Mach 1 is idling at about 1100 rpm and does burn the the tires 1 -3rd, so what gives? Is it tuned? Nastiest 4.6 I ever saw..., and that's after sitting in a field for 5 years.

I'd say its caused more by the tires than any kind of tune. For the idle check for vacuum leaks and make sure the inlet pipe is tight.

 

[GaryZ]

It has a full k&n induction on it. By inlet pipe, are you referring to the throttle body? This is the 1st late model hotrod I've dealt with, so I'm not real bright on the terms. My rods are 60s show and go rides. Sorry.

 

[DSG2003Mach1]

It has a full k&n induction on it. By inlet pipe, are you referring to the throttle body? This is the 1st late model hotrod I've dealt with, so I'm not real bright on the terms. My rods are 60s show and go rides. Sorry.

make a new thread instead of continuing to bump one thats 10 years old and youll probably get more help. Theres a Mach 1 section

 

[DSG2003Mach1]

Check from where the k&n tube connects to the MAF housing to the TB connection. If no leaks I’d pull the maf and spray the sensor real good with MAF safe cleaner

hanging idle like that could be an idle air control valve issue too - mounted on the firewall side of the throttle body with one connector and 2 small screws. You can pull it and drown in carb/throttle body cleaner. Reinstall once dry. If it improves you’ll still probably have to replace sooner than later

 

[CobraBob]

Can you post an exterior and engine bay photo?