I have had this problem for a few and still can’t get to the bottom of it.

The symptom is a miss fire or surge at 1-6psi and 1/2 throttle. At WOT and ~8-20psi the car pulls normal.

I have checked or replaced:

Plugs - replaced
Wires - replaced
Coil pack - replaced
Crane ignition - checked
TPS - replaced
IAC - replaced
MAP - replaced
Volt clamp - replaced
Waste gate actuator - checked
DFI - checked in many many many ways, symptoms always stay the same
Fuel filter - replaced
Fuel pump - checked
Stock o2's (not in use)
DFI's o2 - checked
Lifters/rockers - replaced
Valves/springs - checked

This problem only happens in boost and at ~1-7.

So I still have to check crank sensor, cam sensor and the DFI map sensor.

Do you guys have any other suggestions for me?

TIA
Brian

Is it individual misfiring or is it a drawn out stall situation? If it's just an intermittant individual misfiring thing then I don't know what to think. But if it's a drawn out(1/2 second or more) stall then what I'm thinking is, the only thing thats different here is "half-throttle". The thing about that is that the stock ECU strives for conservative(stoich) fueling at half throttle. It also has a more agreesive timing curve. With a DFI fuel system, the ECU will still push the timing - but is the DFI pulling enough fuel? Maybe your flooding it? There's probably a better way of testing this, but try running it into that situation, then when goes into "stall mode" shut it down immediately and pull a plug. Is it wet? I really don't know much about the DFI, so hopefully a DFI user can help you out more. If it's a drawn out stall kind of misfiring situation - or a "surge" - then it would seem to me like the DFI needs some tweaking for part throttle(stock ECU closed loop operation). This is strictly opinion, I don't have a DFI, I don't even have a turbo - just giving my .02


95 Eclipse RS : 5 speed
15.943 @ 86.48mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html