I have recently experienced problems with my 92 mitsubishi GTO, after having it for about 4 weeks....
One day just driving home it was suddenly misfiring and running on 4-5 cylinders...
Changed the leads and spark plugs for the front part of the engine, as the back to hard to get to....and i found that did not solve the problem.....
In this process though i have found out that the front left cylinder while removing the spark plug was not working by looking at the state of the spark plug
So i removed the spark plug leads while the car was runnin on this particular coilpack(middle coilpack) and BINGO one output does not work
I then went to AFI and bought that exact same coilpack(C9223)...
On the process of installing it i have come accross numerous problems
I lost the nut to connect the coil pack to the cables.....I used duct tape to hold it into place....another foolish mistake was i left the spark plug leads disconnected from the coilpack
also forgot to put the air filter piping back ..
Then started the car and turned over once for 10seconds out of 10 times ive attempted...
I then resolved the problems by getting a new nut, connecting the spark plug leads, and connecting the air intake piping back on....Now the new coil pack does not distribute any spark on both outputs
I think its time i will bring this to a workshop, please advise me if you have a workshop anywhere in sydney who knows what they are doing with their GTO's
This is more then likely an electrical problem
and now the car turns over, but the new coil pack does
I had the same problem I posted it somewhere on the forum. It was the Power Transistor Unit. The most sensible thing to do is take out the coil and the PTU and bench test them as described in the repair manual ie with a volt meter and the resistance or not across the terminals will tell you which one is faulty.
If its your coil pack they are only avail from Mitsu as a single unit or you can go after market. Same with the PTU but I don't know if aftermarket ones are available but I did see something on the Haltech web site that looked like it might work.
If you haven't got acess to a repair manual I'll scan the pages and send them to you.
Of course it could be the ecu, apparently early ecus had leaking capacitors but I'd look at the ignition system first and rule it out before I started on the ecu.
By the way I did all the things you have done before doing the bench tests, changed plugs leads and coil pack put it all back together just to find it still didn't work. Then I got smart.
Think i have a similar problem. I get juice from the PTU when the car is in the "on" position but no sparks are firing as i try to start it. Just keeps cranking. Already took out the ecu. Found it was a little dirty but cleaned it and since i'm getting juice at the PTU that means it's ok right? Would u mind scanning me those manual pages TrueBlue. thanks for any help
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