Installed a flowmaster and having issues

[Zorlack]

JUst got my ST 4.0 V6 back from the shop. Had dual exhaust installed with Flowmaster 40s dual with 2 1/4 pipes. Truckss runs fine but I notice in park when I rev the truck seems to run (spuuter miss???) at about 3500 rpms, what is going on??? Help! :O)

 

[shadowex]

i think you are hitting the park-neutral rev limiter so actually your truck is more than likely working correctly

 

[PRS]

i think you are hitting the park-neutral rev limiter so actually your truck is more than likely working correctly

x2

 

[04trac]

yup, it keeps you from blowing the motor in neutral by over revving the thing

 

[410Fortune]

why rec past 3500 in N? Just to hear your new exhaust?

 

[aldive]

i think you are hitting the park-neutral rev limiter so actually your truck is more than likely working correctly

Definately whats going on.

Its a feature in the PCM designed to keep people like Zorlack
from damaging the motor just to hear it.

 

[flya727]

Zorlak,I did the exact same thing 3 months ago when i got my Magnaflow installed!! Too funny, you never REV it up in nuetral with the stock muffler, but with a new exhaust, you GOT to hear it! I actually posted on the board just like you did and the guys set me straight. I thought the new exhaust messed up my computer, but it really is your REV limmiter.

I now have a SCT flash device, and you can raise that limit with the SCT. Don't woory about it, just drive it and enjoy the 4.0 engine! I just came from a 95 V6 Ranger and could not blieve the differnce the ST is with this 4.o.

Rick

 

[Zorlack]

Thanks so much!

Thanks so much!

I did read back and saw posts with the same issues :O)