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Mysterious Pfc Missfire In An R32 Gtr

itbmils

By itbmils,
in Engines & Forced Induction

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Beer Baron Grand Master

Beer Baron

Posted
Posted

well you fark knuckles! I never had this problem before. but the now it's occaisoinaly started happening. I blame you guys and your thread!

going to try some earthing etc. see how I go.

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89CAL
89CAL

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itbmils Proficient

itbmils

Posted
  • Author
Posted
well you fark knuckles! I never had this problem before. but the now it's occaisoinaly started happening. I blame you guys and your thread!

going to try some earthing etc. see how I go.

it's actually a computer virus I have written for the PFC - that is spread by reading this tread :P

Beer Baron Grand Master

Beer Baron

Posted
Posted

you bastood.

some more info if it helps.

I'm running a BCNR33 RB26 PFC in my BNR32 GTR. It's firmware is version 8.04a (latest firmware) and is not reflashed. It was tuned by PC (using datalogit from memory). running with O2 feedback on (and at least 1 faulty sensor, the other one i'm not 100% if faulty or not).

tune is excellent. car is currently making 270kw atw with 1 bar boost. also running splitfires coils, and NGK copper plugs (BCPR7ES gapped at 0.8mm).

itbmils Proficient

itbmils

Posted
  • Author
Posted
you bastood.

some more info if it helps.

I'm running a BCNR33 RB26 PFC in my BNR32 GTR. It's firmware is version 8.04a (latest firmware) and is not reflashed. It was tuned by PC (using datalogit from memory). running with O2 feedback on (and at least 1 faulty sensor, the other one i'm not 100% if faulty or not).

tune is excellent. car is currently making 270kw atw with 1 bar boost. also running splitfires coils, and NGK copper plugs (BCPR7ES gapped at 0.8mm).

I have my O2 sensors off - also have ~270atw with splitfires and copper plugs

same firmware

PhilGTR Rising Star

PhilGTR

Posted
Posted

I pulled mine apart on sunday to have a look. Mine had a ground wire which was screwed onto the top of the transistor (ignitor pack thingy). the ground wire is connected to somewhere I cant really see as it was wrapped in a cable sheild with some other wires (but I believe its connected to the negative side of the battery. I just cleaned off the rust of the screw and the wire connector and since then i have had no missfires. Before this the missing happened at least once a day sometimes 2 or 3 times. But will have to see if it does it over a few more days.

blur Proficient

blur

Posted
Posted

i have had this problem too, ive located it to a faulty tps switch, it drops out and gives flat spots just on low throttle. very very intermittent.

btw 60 knock is regared as an "event" 20-40 is acceptable i believe. ive never seen more than 40 and only on decel, never on acceleration.

itbmils Proficient

itbmils

Posted
  • Author
Posted
i have had this problem too, ive located it to a faulty tps switch, it drops out and gives flat spots just on low throttle. very very intermittent.

btw 60 knock is regared as an "event" 20-40 is acceptable i believe. ive never seen more than 40 and only on decel, never on acceleration.

so - a new tps ?

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted

Its like a curse., F%$K Y&^...noticed it the last couple of days on low RPM cruising along.

Why did I look for it.?????...could have had the stereo vibrating the car and would have never noticed.

My cover is off ,,,I have a PFC, Splitfire coils and the ignitor pack is not attached to anything.

Some-one please post up a quick fix with some wiring info......I have nowhere to fix it to.

If you don't I will put a Hex on all your cars :ninja::dry::D

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted

OK Then....here is a quick mod. I have completed today to see if it stops the missing.

One fixed point........the other a cable tieing up 2 other points and fixing to another point.

The wire is thick on the second....and no movement at all.

So far tonight had no missing.......infact car is running smoother. :P

If it happens again...I will replace tps.

post-29124-1160561958.jpg

  • 2 months later...
my_gtr32 Collaborator

my_gtr32

Posted
Posted

Did a simular thing to my R32 GTR recently. Ran a ground directly from battery negative to transistor module. From transistor module to both rear and front coil pack mounting bolts. Also cleaned paint off mounting pads for transistor module. To date, no missfire. Blooody unreal, all sorted. :sorcerer:

I pulled mine apart on sunday to have a look. Mine had a ground wire which was screwed onto the top of the transistor (ignitor pack thingy). the ground wire is connected to somewhere I cant really see as it was wrapped in a cable sheild with some other wires (but I believe its connected to the negative side of the battery. I just cleaned off the rust of the screw and the wire connector and since then i have had no missfires. Before this the missing happened at least once a day sometimes 2 or 3 times. But will have to see if it does it over a few more days.
widebody32 Community Regular

widebody32

Posted
Posted

Had the same problem with mine. Checked the earth on both the ignitor and the coil packs and found both had loose connectors. Soldered the connector to the wires and misfire has gone. Also problem only occurred once i took the cam cover off.

  • 3 weeks later...
Topaz Grand Master

Topaz

Posted
Posted

I get this misfire once a month on average. It feels ike the engine just skips a beat, I thought the timing belt was slipping the first time I felt it :)

My recent re-tune brought my knock level right down. At start up it jumps up to 80, but once I reset it and drive, even with a cold engine I rarely see knock over 18 now.

  • 2 months later...
DALLAS 2 Newbie

DALLAS 2

Posted
Posted
you bastood.

some more info if it helps.

I'm running a BCNR33 RB26 PFC in my BNR32 GTR. It's firmware is version 8.04a (latest firmware) and is not reflashed. It was tuned by PC (using datalogit from memory). running with O2 feedback on (and at least 1 faulty sensor, the other one i'm not 100% if faulty or not).

tune is excellent. car is currently making 270kw atw with 1 bar boost. also running splitfires coils, and NGK copper plugs (BCPR7ES gapped at 0.8mm).

HI THERE. MY R32 GTR HAS THIS DAM APEXI MISFIRE ALSO. WHAT I HAVE NOTICED AFTER HAVING THREE SETS OF O2 SENSORS INSTALED THAT ONE OF THEM WILL ALWAYS SHOW THAT IT READING JUST ABOUT ZERO IF NOT ZERO VOLTS WHEN THE CAR IS WARM OR HOT, FROM DEAD COLD START YOUR CAR AND HAVE A LOOK AT YOUR HAND CONTROLER AND KEEP AN EYE ON THE O2 SENSOR VOLTAGE WITH BOTH OF THEM TURNED ON AND SEE IF THE NUMBER TWO O2 SENSOR STARTS TO LOOSE VOLTAGE AS THE CAR WARMS UP. WITH MINE IT IS ALWAYS THE NUMBER TWO O2 SENSOR ON THE HAND CONTROLER. THE NUMBER TWO O2 SENSOR ITSELF IS IN THE POSITION CLOSEST TO THE FRONT OF THE CAR.

I HAVE ALSO NOTICED THAT THE MISFIRE IS THERE WITH THE O2"S TURNED ON OR OFF. I HAVE HAD MY CAR TUNED BY 4 DIFFERENT TUNERS TO TRY TO GET RID OF THIS MISFIRE AND NO LUCK. CAR RUNS A NICE POWER OF 384.4 HP AT THE WHEELS.SOME SAY THAT THE APEXI IS THE WAY TO GO BUT FOR MOST OF US WITH R32 GTR,S. ALL THE BEST

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