ok.. so I was drivign my car.. no problem. parked at my parents for about 20min.. get back int he car.. try start and.. no start! cranks but the INJ and FP relay don't click over. after soem messing around I can not get the thing to go.

pulled the ecu off looked good, opened it up and found the trace from pin 10 is black and broken. from what I can see in my diagram pin 10 goes to pin 85 of the fuel inj relay.

ECU is...was an L6 with a what is supposedly a stage 1 chip.. however only got 7PSI of boost and still have..had.. that studder at 1500 and 3000 that I could never figure out.

so few questions. how the hell did my ECU fry itself!!??

could this have been causing my studder the whole time?

and does anybody have a spare they will send to canada??

 

 

If boost is 7psi likely to be normal chip, I would guess the burnt track was caused over a long time possibly by a short on the output side connections, as this outputs to the fuel pump relay this can definitely cause all manner of running issues, maybe you could wire around it ?, as it's duff you have nothing to lose, alternatively wire the pump relay direct to try via a temporary trigger, I assume you have rewired the fuel pump itself, if not do so now anyway.
Stutters can also be caused by other things of course, but fix what you know is wrong first, what does the chip look like, normally they are marked, certainly a lot mark the chip so can trace it by contacting chip maker/supplier to verify spec of chip.
There is a HUGE amount of difference between a std 7psi and a stage 1, 14 or so psi is performance terms, see if the actuator on the turbo ends with the number -31, as stage 1 are often changed to this.
tabetha

 

As said 7 PSI is around standard boost, I to would be inclined to repair myself by remaking the track with a piece of wire or alternativly you can buy copper pens to remake the track, the ECU's are extremly scarce, your best bet would be to keep at look in the for sale section of this site or try the likes of North Yorkshire Spares if you did want a replacement and yes it's could quite easily cause the studder.

As said above the chip should have a sticker on it if it's remapped.

Martin

 

I tried to run a ground from the FP relay directly to the battery.. in theory that should have at thte very least allowed the relays to click over but they didn;t. so the cars sitting dead.

now as far as I can tell this IS the output side of the of the "coil side"of the relay is it not? so its a ECM controlled ground? Because I also seem to have a short to ground on pin 20. if I pull my FP inj relay and test for ground on pic 87 I get a ground... it looks to my that pin 87 (red wire) feeds poer to my FP relay, fuel injectors, then goes back into the ECM. I pulled the injectors harness off, still had ground, pulled the ecm off and I lost the ground. so it seems to me I have more then just a burnt trace going on indide the computer.


heres a shot of the ecu only 3 weeks ago. the trace looks perfectly fine.


this seems kinda hoaky.. but some 1 told me it may have been live mapped. I'm inclined to think its just a sticker and I got screwed. or an idiot tuned it and somehow killed my computer.

 

Yes the ECU trips the relay negativly and so if you earth the relay the pump should run continuously, if not then it's NOT an ECU problem. You should also find the amal valve will not click when the ignition is switched on, as this to is powered from the fuel pump relay as well as the ISCV.

The earth from the relay should go to pin 28.

Edit: Those pics also confirm what we thought earlier that it does have a remapped chip.

Martin