The other day I did the diode mod on my 03 a4. The problem I'm having is whenever it gets to around 18psi the car starts to misfire. The more gas I give and the higher the rpm the less it seems to miss. It really only happens when I am in 4th or 5th gear. I tried putting new plugs in it and the problem did,t go away. I also have a check engine light says turbocharger underboost. Also it boosts a bit higher and spool better when the throttle is depreesed 3/4 of the way as aposed to wide open. I am currentl using a cheap boost controller until I order a turboxs one. Thanks for the help and please nobody tell me to get a chip. I have plans to eventually go GT28rs.

 

hey man im bringing this thread back because i have a diode modded 2003 and experience the exact to a T symptoms as you stated, we need to get to the bottom of this. Also what is your mbc set at? Im right at 16psi now but up until a few days ago i was at ~18psi

barrett

 

hey man i posted you thread here

http://www.audizine.com/forum/showth...11#post3017311

hopefully we can get a response...

barrett

 

Im pretty sure that I bought the rong plugs. I amgoing to try copper plugs once i put my clutch in and see what happens.