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Rb20 Missing On Cylinder 4

carl h

By carl h,
in Engines & Forced Induction

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carl h Proficient

carl h

Posted
Posted (edited)

heres the situation...

rb20 using a 25 pfc, drove the car up to school and it was flawless parked it over night went to go to the store and found cylinder 4 had mysteriously stopped firing.

plug was drenched in fuel and pulling the injector clip while it was running made no change in engine speed/sound.

swapped ignitor out with 2x spares as well as my known good stock coils, still nothing.

continuity tested the coil harness and it appears to be fine as well.

HELP!

Edited by carl h
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https://www.sau.com.au/forums/topic/181443-rb20-missing-on-cylinder-4/
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sky_2.0T Enthusiast

sky_2.0T

Posted
Posted
heres the situation...

rb20 using a 25 pfc, drove the car up to school and it was flawless parked it over night went to go to the store and found cylinder 4 had mysteriously stopped firing.

plug was drenched in fuel and pulling the injector clip while it was running made no change in engine speed/sound.

swapped ignitor out with 2x spares as well as my known good stock coils, still nothing.

continuity tested the coil harness and it appears to be fine as well.

HELP!

check compression ,swap ecus

blind_elk Grand Master

blind_elk

Posted
Posted
check compression ,swap ecus
The coils would still fire with less than optimal compression.

carl, so you've tried a different coilpack in #4. And you've tried swapping that coil to another cylinder? It sounds like the circuit in the PFC has crapped its pants. Don't ask me why, though.

paulr33 Grand Master

paulr33

Posted
Posted

hi carl

when you made the 25 PFC work on your 20 how did you manage the injector flip

was it hardwired? solder change? board change inside? this could be a hint, maybe a connection has come loose

carl h Proficient

carl h

Posted
  • Author
Posted (edited)

injector driver swapping was easy as, just remove the pins from the ecu connector and swap...

gonna test for spark today and if i have spark then fingers start to point at the fuel system.

as far as the pfc being damage, i dont believe that is the problem...i opened up the pfc and inspected it and there were no signs of burnt traces or the scent of a toasty ecu.

Edited by carl h

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