AGU Misfire, only when hot and under 10psi boost or more.... Coilpacks?
guys, I've been ahving problems now for a few months with a misfire.
Strangely, when warming up, and for a few minutes when it's up to temperature, it's absolutely fine, but it seems that when it's been warm for more than a few minutes, the problem starts.
Driving around slowly, the car is 100% fine, and drives normally, even at part throttle, provided boost doesn't exceed about 8-10 psi, it'll pull right through the revs problem free.
The problem is, when i floor it, and it boosts over 10-12 psi, it starts to misfire VERY badly.
i first thought this was due to old plugs, so replaced the plugs with brand new iridium densos. No change.
I then thought, much like Welly, that it might be the coil pack wiring insulation breaking up, allowing the wires to short. I stripped it all back this weekend, to find all the wiring still perfectly intact, and still very flexible. I retaped it all, and the problem is unchanged.
This leaves me to think it's the coilpacks breaking down under heat/high load.
Has anyone ever heard of AGU coilpacks blowing before? under heat and load only?
id there anyway to tell which coilpack is blown on an AGU?
Am I able to scan for misfires in VAGcom on an AGU>? module 1 shows no faults at all.
Any ideas would be much appreciated, I'm off to the ring in 6 weeks, and really need to get this sorted!