SRT4 Breaking up at 4500RPM under boost.

[DaZone]

1st thing.
check and re-gap plugs . mines .035

I had similar problem recently. also had a CEL for bad downstream 02 sensor.

i changed that. I still had same problem. Then i bought a walbro 255.

problem fixed 26psi spike. no stuttering and backfiring.

[Michigan_SRT]

I will try the .030 tonight.. How do i tell if my wires are bad also? I was thinking maybe that was the problem, because I had a misfire code. 0300

[Michigan_SRT]

bump for resolving.

[ReiKo]

Quote: Originally Posted by Michigan_SRT

I will try the .030 tonight.. How do i tell if my wires are bad also? I was thinking maybe that was the problem, because I had a misfire code. 0300

Your misfire code could be from a bad plug...

Take the plug out and connect it to the wire and ground it out... See if you get spark...

[buzzfast]

Quote: Originally Posted by DaZone

1st thing.
check and re-gap plugs . mines .035

I had similar problem recently. also had a CEL for bad downstream 02 sensor.

i changed that. I still had same problem. Then i bought a walbro 255.

problem fixed 26psi spike. no stuttering and backfiring.

im with you on this one. i think i have a fuel problem. seems like its cutting out on fuel. i read somewhere that also the stock filter gets plugged up quick.

[D-Man05]

i had this problem for a while with mine when i first bought the car.. i replaced the stock wires and coil for msd and changed the plugs to NGK iridiums. after that the car ran great. after about 6 monthes the stuttering started popping up again.. thinking maybe it was the wires I pulled them off to investigate. turns out the electrode inside the black boot on BOTH sides had receeded inwards a bit.. i realized then that i had been pulling the wires off quite frequently for cleaning/maintenance and because of that, the metal on metal contact with my DIS got worse and worse.

long story short i simply took some needle nose plyers and reached inside to pull the electrode out a little.. after that car ran smooth as glass once again.
hope this helps your problem

Dustin

[deejaysparkz]

i have the same thing.. was running fine when the plugs were gapped at .35 then my mechanic put them to the gap of .50 that there supose to be at.. now im getting the break up.. ima see if putting the gap back donw will fix it.