Hi my alternator went the other week a new one turned up today. fitted it after work. started it up mint still had its stupid miss fire. thought id let it warm up and run for a bit as it haddnt been started for a while it was idleing for a about 5mins. and as i was tidying up i was listenitng to it and i could here it was starting to die. gave it a rev and it was strugeling and wouldnt rev! checked the voltage on the power fc and that was fine about 14v. then it stalled went to start it again turned over fine started for about 2secounds miss firing coffing and spluttering then it died and did that every time i started it! any ideas ? :faint:
more problems and the old ones
- Thread starter john4688
- Start date
stumo
Active Member
please list what you've done and what you've found....
Ok I ve still got the same existing miss fire at 2000rpm! T he alternator died so ichanged it I started it up and it was ideling fine reved it and still had the 2000rpm miss fire! So ileft it running while I tidyedup my tools and after about 5mins I heard the engine starting to die! So I looked at volts on the power fx and it was 14volts so they alternators charging! I tried to rev it a little and it coughed and spluterd then cut out! I started it Again again and it stared coughed and spluterd then died again! I've rechecked my work doing the alternator and that's fine! Before that I changed plugs leads rotor arm dizzy cap cas unit coil ignition module ecus airflow meters and nothing!
keastygtir
Well-Known Member
fuel pump?
plug gaps?
engine grounds?
AFM wires?
Injector plugs?
Thats what occurs to me
plug gaps?
engine grounds?
AFM wires?
Injector plugs?
Thats what occurs to me
stumo
Active Member
me too.
blocked fuel filter?
fuel pump, or pressure?
is it just a missfire at 2000 or is it worse than that and you can't drive it or rev it above that?
Do you have the PFC boost controller? Is it connected to the PFC?
If you don't have the PFC boost controller have a look to see if it's switched on.
stumo
Active Member
do you have the PFC controller? check to see if the boost controller is switched on or not....
you can hear the fuel pump working as you turn on the ign but don't turn the engine over....you'll hear it working for approx 5 seconds.
You can see if it's then making pressure by putting a guage in the pipe that goes from the filter to the fuel rail
you can hear the fuel pump working as you turn on the ign but don't turn the engine over....you'll hear it working for approx 5 seconds.
You can see if it's then making pressure by putting a guage in the pipe that goes from the filter to the fuel rail
stumo
Active Member
Have a look here.......
http://paulr33.skylinesaustralia.com/docs/powerfc-faq/powerfc-faq.htm
and esp here......
http://paulr33.skylinesaustralia.com/docs/powerfc-faq/powerfc-faq.htm#40b
http://paulr33.skylinesaustralia.com/docs/powerfc-faq/powerfc-faq.htm
and esp here......
http://paulr33.skylinesaustralia.com/docs/powerfc-faq/powerfc-faq.htm#40b
stumo
Active Member
that can be checked on the hand controller....it shows the temp
stumo
Active Member
dunno, i was letting him know it can be checked, wasn't being funny with you if that's what you thought.
P
pulsarboby
Guest
what about cold start device (iac valve) on back of plenum, could be sticking on, sounds as though car is massively overfuelling.
also has anyone actually checked the map out yet on the pfc as it may be all wrong!
there is also another possibility.....have you got the carbon canister still on the car? if so then is it plumbed in correctly?
ive seen it done where the pipes have been connected wrong and the canister becomes pressurised which in turn pressurises the tank and fuel lines....this can lead to excess pressure at injectors causing them to put to much fuel in cylinders.
easy way to check this is by feeling the canister and see if it bellows when car is revved
also has anyone actually checked the map out yet on the pfc as it may be all wrong!
there is also another possibility.....have you got the carbon canister still on the car? if so then is it plumbed in correctly?
ive seen it done where the pipes have been connected wrong and the canister becomes pressurised which in turn pressurises the tank and fuel lines....this can lead to excess pressure at injectors causing them to put to much fuel in cylinders.
easy way to check this is by feeling the canister and see if it bellows when car is revved
Check your Crank angle sensor. I had the same problem on my car and even got an scope on the signal to check it worked. It worked fine until around 2-3K and felt like a rev limit but generally ran poorly until warm.
Andy Chan's car had the same issue when I was going to map it. I didn't even check as I just told him to get a couple of spares and try them.
I haven't worked out what it is yet which is annoying as I am convinced there are still secondary issues. My prime suspects are earthing, filtering or the PFC is expecting a variation in model number of the CAS. I do know a new standard one from Nissan seems to cure all the ills but that is £500.
If you car works fine on the standard ECU but not on the PFC then that would be my prime suspect.
Jim
Andy Chan's car had the same issue when I was going to map it. I didn't even check as I just told him to get a couple of spares and try them.
I haven't worked out what it is yet which is annoying as I am convinced there are still secondary issues. My prime suspects are earthing, filtering or the PFC is expecting a variation in model number of the CAS. I do know a new standard one from Nissan seems to cure all the ills but that is £500.
If you car works fine on the standard ECU but not on the PFC then that would be my prime suspect.
Jim