PFC help

[Cubes]

Darren Dude..

I did connect wire53 back up as some one had previously cut yours.

You still don't get a speed reading (PFC and the DASH) because your speedo drive cog has fallen off.

You will once that has been sorted out, well you should as how else would the ecu know when to cut once you hit 180-185km/h.

[R31 POWER]

I don't know what up with it Jeol,I did the loom install and we never cut the speed wire and the speedo wire is all connected to the ecu/dash.The speedo works in the R31 dash so yer who knows.

[Bl4cK32]

Is their a wire off the rb20 gearbox that goes to the ecu to get a speed reading? Ive changed to the rb25 box, and dont have all the plugs wired up.....

[Cubes]

The only wires my rb20t box has going back to some where appears to only be a reverse light. There is 1 plug that doesn't appear to plug in to anything.

R31Power, You are 100% sure that some one previously hasn't cut the ecu's speedo wire?

I'm assuming the R32's get their speed reading from the dash once its converted from the mechanical cable to the dash.

I'm dropping a PFC in to my 32 this week so I will find out if the R32 does indeed report a speed reading on the PFC H/C.

An inspection of the R32's wiring diagram could answer the question.

[Roy]

You will get a speed reading on your PFC hand controller. And my understanding is that the ecu gets its speed signal from the dash once it has converted a signal off the mechanical speedo cable.

[R31 POWER]

Ok I think my TPS has shat itself.I've tried from 29mV right upto 49mV and when I back off it does'nt!!!it slowely decreases the injector duty cycle.At all different rpm and settings it's different grrrrrr.What have you RB20 boys got yours set to.

[Cubes]

Mines set on 46mv or what the pfc reads .46v.

It occasionally flicks between .46v & .47v.

I always get 0% duty cycle when decelerating.

Only when cold will it pop or run on a little while decelerating.

If I set any lower than .46v I get a slight flat spot on the tip of the accelerator.

[R31 POWER]

Good shit Joel.Yer mine was set at 46mv I think before I fiddled with it but nearly everytime I backed off it would spike the duty cycle then go 0.0%.Now it wont decelerating on any setting straight away.

You no how the shaft coming out of the T/B is a moon shape and that fits in the TPS,well do you think it's flogged out?I might give it one layer of tape coz i'm sure it was fairly loose.

[Bl4cK32]

yer, i got mine set to 0.46 on the commander.

i have noticed with the larger injectors if i change early and dont rev out gears (cos mr policeman is near, and im trying not to let the bov go woosh ) i usually end up getting a backfire pop out the exhaust....

[R31 POWER]

I fiddled more and it's still farked!! and I even tried another TPS.I put crc in the connectors just to make sure and it's still not loving it.

Some times backing off it will be ok but other times it still pushes the car.I puller the cooler pipe off and looked in the T/B and it's spotless and not sticking.I'm running out of ideas guys.

[R31 POWER]

Ok it's set at .46mv and it's fine *confused*the only things I have done is push the plug in the ecu more and unhooked the commander,but I done the above at the same time.It idles dam good to

Moral of the story is to make sure the ecu plug is pushed in fully

[R31 POWER]

Riddle me this.Cold morning,water temp hits 30degrees and the revs start to fall(as it should) but then goes back up?It will vary from 1000rpm right upto 1400rpm :bs!: then the good part I pull the commander plug from the ecu and it idles fine :Bang: Once the motor gets warmer it's fine but these cold mornings are giving it greif

I know the commander should only be unplugged once the motor is off but cbf and this idle prob is killing me.It's not hunting coz the injector duty cycle is'nt going to 0.0% then back up,so what does this mean??

Also note my battery is in poor health,could that be a prob.

[Sydneykid]

  R31 POWER said:

Riddle me this.Cold morning,water temp hits 30degrees and the revs start to fall(as it should) but then goes back up?It will vary from 1000rpm right upto 1400rpm :bs!: then the good part I pull the commander plug from the ecu and it idles fine :Bang: Once the motor gets warmer it's fine but these cold mornings are giving it greif

I know the commander should only be unplugged once the motor is off but cbf and this idle prob is killing me.It's not hunting coz the injector duty cycle is'nt going to 0.0% then back up,so what does this mean??

Also note my battery is in poor health,could that be a prob.

Hmmmm that's weird, unplugging the Commander shouldn't make any difference. What voltage does it show at idle?"cheers:

[R31 POWER]

Excellent a reply

it's showing 13.8volts at idle and the water temp is at 73degrees.It only revs up and down when the water temp is under 50degrees or so with the commander plugged in.Very strange.

[Sydneykid]

  R31 POWER said:

Excellent a reply

it's showing 13.8volts at idle and the water temp is at 73degrees.It only revs up and down when the water temp is under 50degrees or so with the commander plugged in.Very strange.

My first guess would be the standard wiring harness plug is not inserted into the PFC perfectly. I have seen this a number of times, it's the first place I would check.

[Scooby]

I know a guy who had chronic problems with his PFC and found loose wiring in the controller. Unlikely but it might be worth as look.