Misfiring HELP
 

Here's the problem: I give the car some throttle either in 2, 3, 4, or 5 and above 5 psi, and above about 4500 rpm, the car's power is not smooth and it seems to be either hesitating or misfiring. Also the exhaust tone changes from smooth to a sputtering sort of crackling noise.
PLEASE HELP

Mods done to car:
2.5" exhaust with high flow main cat
hks powerflow intake
hks f-con
ball and spring boost controller
t3 / t4 turbo upgrade

thank you, Dave

Does it do it at ALL during deceleration? Checked the TPS? New injectors/cleaned injectors? Signal from the ECU to the secondaries good?

I don't think it the injectors as they were just bench tested. As far as the elctical signal to the 2ndaries...mabey it's messed up....how can I check it? What else could be cousing these high boost/rpm stumbles?

HELP!

did you upgrade your fuel pump? and what size injectors are you running? maybe you're leaning out your car...

- Kevin

I had exactly the same symptoms. Turned out the be a stuffed leading plug lead. Replaced it and it ran like new. :D

Kinda off-topic, but how did you get that T3/T4 hybrid onto your FC?


-Ted

hey NZConvertible what is and were is the leading plug lead? what did you do to fix it

The spark plug lead between the leading coil (behind LHS headlight) and the leading (lower) spark plugs. I just replaced the broken one but I figure if one failed the rest can't be far behind, so I'm getting a set of Magnecore KV85's soon.

It's a Knight Sports Turbo upgrade kit. It came with a new intake housing and new, upgraded impellars that work with the stock exhaust housing. It's actually a Turbonetics Intake.....