[Fugu]

Okay, so when the car is cold the exhaust will pop and rattle almost like a rich sounding condition from a Turbo car. Once the car is warm it goes away.

This is very very annoying as I would have to wait 5 minutes everytime I hop in my car to avoid makeing rattling noises going down the street.

So starting up the car, and waiting a few seconds for oil pressure , I can throw a less then 4000 rev and it will pop and sound like Rocks hitting the muffler.

Its a FlowMaster muffler and all connections were checked by Ford a few months ago.


Am I running overly rich at startup? once the car is warm and the fuel maps go to normal then the sound goes away.


Am I losing power by lack of ignition, improper detonation unburned fuel getting into the exhaust???

[stlwagon]

Sounds to me like a normal cold startup sound with Flowmasters. Is the car custom tuned?

[StateStang]

My car does the exact same thing, but it hasn't bothered me too much. Do you have the american thunder exhaust?

[Fugu]

so no on a custom tune and it is a single muffler. It did it with the stock muffler as well.

Too much fuel getting in the exhaust and igniting??