Hello.
I have a 12A bridgeport MS2/extra, Relay box, ITB 2x 900cc with CAS and FC coils.
Car had been running good for a while and then suddenly it started what it sounded to me like running on one rotor.
I thought it might be the Leading coil so i bought another one and swapped it and nothing.
Changed to the OEM spark plugs from the champion racing ones and nothing.
Eventually i found my ign table, the axis was scaled wrong so it was idling with ign around 24 deg. I rescaled and changed to 5 deg for idle and it started running good again.
I thought the issue was fixed, car started and warmed up fine, but it was a bit rich around 12.5 so i decided to rework the whole VE table.
With the car warm, the new table started the car perfectly fine and it idled great and the AFR was around stoich 14.5 to 15.3.
Before i changed this table, i had installed an efan with a chrysler PWM controller and i am using the idle control to have that PWM control. I tested it in the test mode and everything was good.
Started the car with the old and new VE table and it ran good, execpt the fidle relay on the relay board was clicking because i had the frequency too low. I increased that to max and it stopped clicking and fan ran good.
Suddenly after running good and being warm, it started getting super rich and it died. restarted it and same thing, started good and then would go rich and die.
I thought the fan draw could be causing the issue, so i unplugged the fan and the pwm plug, but at this point it was back to what it sounded like running on one rotor.
Gave it more fuel, less fuel, more timing, less timing with no change.
I think at this point my WB sensor might be damaged because even when i was giving it more fuel, it was reading lean now, popping and back firing.
I saw i had WB PID control turned on, so i turned that off in case that was it, no difference.
Turned off all the possible corrections in case that was causing an issue and no difference.
Fuel pressure is solid, it sounds like spark/ign.
I am out of ideas. I have attached composite logger and data logger files in case anyone can spot something wrong in the files.
Please change 2023-02-21_18.11.02_mlq from .csv to .mlq
said format was not supported so i renamed it to csv
Thank you for the help

 

I found out it's the spark plug wires grounding out.