uberstang1

Noticed under hard accelaration i poured out a bunch of black smoke, ran the CEL and i got a code for Evap Control valve, my question is will the Evap system in general have any bearing on performance of the vehicle or is it strickly emissions. Just wondering if its even worth it to raplce the control valve.

6mustang6

well if you pouring out black smoke, you are running rich, which is hurting your power.

uberstang1

My tune is a little on the rich side which is fine, i can't afford to push any more power ont he stock internals.

cliffyk

Don't know for sure about the 4.6L 2V, however on many cars the evaporative emissions purge valve can get whacked out when it encounters boost (normally it only sees vacuum)--it is common practice on mnay boosted applications to put a small check valve into the vacuum lines to the purge valve and PCV valve to prevent them from "seeing" boost. The boost may be messing with things and causing it to throw the code.[/align][/align]Black smoke is almost always excess fuel related, it couldbe that you are just going pig-rich at WOT, do you have a wideband O2 sensor?[/align]

uberstang1

Front two O2 sensors are shut off, rear o2 sensors are factory, i am not running a wideband air fuel/guage, stuck with a narrowband so trying to get an accurate reading of that is pointless.

uberstang1

As far as the evap control valve and what not goes, the control valve and sensor you have to get from ford, so i gave them a call and they run around 70 a peice, but he said it has no bearing on how the car runs its strickly emmissions related, so im gonna just try and spray out the valve with carb clearner if its gunked up, if i still keep getting the code ill just delete the whole thing along with the vac canister, not concerned with the emmissions aspect, as far as the car running rich, it was just on the dyno and retuned 2 weeks ago, and it is a bit on the rich side i dont have my printout atm to check the air fuel numbers, but it shouldnt be going pig rich at wot, the only thing i dont undestand is it doesnt do it every time you hammer on it, just occasonally,so im not sure what is going on, ive been having an ongoing problem with fuel related issues since the motor swap , i get a constant CEL for a fuel pump relay but according to the wirring diagram is located in the trunk on a 4.6 DOHC, on the 4.6 SOHC, so im working on wirring that in but i dont think it is the cause of the problem.

cliffyk

What usually happens with a narrowband sensor/guage when you go very rich is that the reading will climb rapidly toward and off the rich end of the scale and then go away completely and maybe even cause the lean end to flicker.[/align][/align]The narrowband sensor's output drops to nadawhen the mix goes richer than 11:1, this makes the gauge read nothing or flicker at the lean end--if the engine feels like it's bogging when it's blowing black then you are way too rich...[/align]

uberstang1

Not expereinciing and bogging or lose of performance.