David.wynne.jones

Thanks for the input Adam, I was mindful of the high/low signal duration when fabricating the tabs on the back of the flywheel, however it was difficult for me to know the location of these tabs relative to where they were originally on the CAS in relation to the cam signal. Eventually got running fine in the end so I was able to neglect the difference using the trigger offset function, unless I somehow managed to align the tabs exactly where they were on the cas, which I'm sure I didn't given the trigger offset was different to the other basemap on the only other 6g72 thread I saw. There is currently a misfire under high load and high rpm however I *think* its not trigger related. I fabricated the flywheel tabs based on the dimensions of the gen 2 6g72 trigger plate (gen 1 has only cas) and it seemed to work well. There really was no other way I could think of to do this on a GTO given the tight space in the engine bay near the pulley, I couldn't find a good place to mount a sensor near the pulley on the block. I was told to run a custom trigger wheel off the pulley but there was really nothing to attach the sensor to on the block, without complicated fabrication to attach to a bolthole on the block and cut holes through the plastic belt covers. I'd be interested to know how others have done it on a gen 1 if they didn't use the cas.

New spark plugs and she was away with minor changes to the base map. Hopefully the map helps some of the other GTO's get running as I couldn't find any on the net. The plugs must have been fouled from the changes to fuel when starting and the numerous starts trying to get it going. Cars getting a new oil pump and cambelt, will take to a tuners and update this with any changes they make. The OEM ISC still isn't working properly but the car still runs with the OEM idle control screw. Hopefully some more GTOs get a link and a tune, link has incredible technology. NB: The trigger offset will not be the same on your 6G72, I have triggered off the back of the flywheel using a hall effect sensor mounted into the sandwich plate. The location of the 3 teeth on the flywheel were chosen pretty randomly (120 degrees apart still obviously) so it's unlikely to be similar for others. The crank signal on the CAS was too weak for the link to pick up, with multiple different CAS they all had very poor crank signals. Must have been a bit of a design fault. The cam signal was fine so that was still used for trigger 2. Current GTO Map.pcl

Hello guys, Finally sorted all the wiring, everything is timed, trigger 1 and 2 signal is strong, timing has been done with a timing light. This car is triggering on the back of the flywheel with equally spaced notches equivalent to the crank angle sensor spacings on the second gen motors. This is a first gen and the crank signal was on the cas which was faulty, trigger 2 is still strong though. Many other cas I tried has a similar issue with faint or weak crank pulses. Attached is the map I'm using, had a fiddle with pretty much everything I can think of and it doesn't even sound close to starting. It's got 6 coil on plugs and all of them have been tested and working. Fuel pressure is good and been tested, factory pressure regulator seems to be running it at around 35 psi ish. It had one brief sign of life on initial crank but nothing else seems to be happening unfortunately. The car won't start for the life of me, open to any suggestions. Saved a bit of a log file too. Cheers guys 6G72 GTO no start.pcl Log 25-11-22 4;12;08 pm.llg

What is the voltage supposed to be on the trigger 1 and 2 pins? Reading 4.5v on both of them. Is it not supposed to be 0v? Cheers

Thanks for the reply Adam, I did also think it was weird, but clever also. I was actually testing it with a 12v signal too, after I realised it was probably wanting a 5v signal... pretty solid coil I put a small led in the output of cyl 1, videoed it, and played it again in slo-mo, pretty much six pulses per tdc. I think the Mitsubishi GTO trigger option in that version of PC Link could be wrong. I'm going to try again tomorrow on 1 tooth per TDC. The 6G72 (1992) crank angle sensor is actually on the cam also, it is a 3-tooth disk, so 3 teeth on the cam = 120 degrees each on the cam x two = 720 degrees. Hopefully the trigger 2 options pick up the cam angle okay, it is a 3 short 1 long disk, unsure if the cam pulse or cam level is best, probably try both and see which one has a trig error. I saw another post on the forum who had a gto running on the gto trigger option, I really doubt the trigger option is wrong, but I know the red xtreme ecu I have is pretty old.. who knows

Hi guys, I've gone from a wasted spark set up to coil on plug, and the ignition timing is super inconsistent, its firing every 5 or 6 times every 720 degrees when it's supposed to happen once theoretically. It's a stock Mitsubishi GTO with a 6g72 and the only difference is there are 6 coils instead of 3 coil packs. Obviously, the signal wires are wired individually to the ECU and the power and ground are grouped and wired appropriately, it is set up for sequential ignition. The triggering is picked up fine, the RPM is being read accurately, the trigger wires are shielded, and the offset is correct. I can't find any other explanation for the inconsistent and random timing of the sparks. I've attached the base map, I've changed the dwell settings up from 1ms to 5ms, still no changes. An interesting note is when the coils which are from a Mazda premacy are bench tested, they don't seem to care whether the signal is a pulse or not. I've tested a dwell time of 1-5ms and also held the signal high for a few seconds and it sparks away the whole time, almost as if it has its own self discharging. Not sure how any other coils work but thought it was interesting. If the ignition timing was every 120 degrees it would somewhat make sense, but its 5 or 6 sparks per 720 degrees which makes no sense to me. A low or high dwell only changes the spark energy, no change to the timing of them. It's very peculiar and the only other explanation I can think of is that the ECU could potentially be faulty, surely not... A_Mitsubishi GTO G4 Xtreme.pcl

Hi mate, did you end up getting a basemap from anywhere, I found one on another forum here's the link His trigger offset was -83, what did you end up using? I can't get mine running and I'm pretty sure my offset is wrong. Seen 70 -75 and 337 around on the internet but I calculated +5 offset when I did it. Is yours running? Cheers

Can someone conform this statement? "Igniters charge coil when input is high, spark occurs when input goes low. This is known as Rising 'Dwell Edge'" So, what I'm gathering is Dwell edge is the opposite of spark edge? In the PC Link you can only choose Rising or Falling for the spark edge. Thanks Might have answered my own question when looking at the old installation guides... This may or may not help some people, had me stumped for a while (and cost me some coils or ignition modules I suspect) Moderators feel free to remove this topic if you think it's unhelpful lol.