R33 Gtst Cutting Out Under Load

[soultz]

ive got a exhaust thats it, plus the coil packs. the spark plugs are brand new, gapped to 0.8mm

[Rolls]

There you go chances are it is running more boost than stock, eg R&R

what number does it hit on the stock gauge?

[arrydjay]

Could the o2 sensor make it run rich and miss? Mine was getting really bad fuel economy and I read on here that the o2 sensor should be the first thing to change. I disconnected the old one and started the car and went for a drive and it runs exactly the same....so im guessing it was cactus. Havnt had a chance to drive it yet with the new sensor.

[Rolls]

o2 sensor has nothing to do with the on load fueling only around town. It is possible it is the cause of poor fuel economy though. Get a consult cable and find out what sensors have failed.

Actually an air leak will make the car run rich hence rich misfire, it will also cause bad fuel economy.

[arrydjay]

What is a consult cable and where do I get one?

[Rolls]

Go see a workshop, or search the forums.

[soultz]

boost gauge goes to 7 psi max. dont go over that. holds boost too...

[Rolls]

boost gauge goes to 7 psi max. dont go over that. holds boost too...

The gauge isn't in psi, it is in mm of mercury. What does it read in that?

If it is 7x10mmHg it is 14psi which absolutely explains the misfire.

Edited March 8, 2012 by Rolls

[soultz]

i dont have a stock gauge, ive got a gtr cluster

[soultz]

i manually fitted a boost gauge so i could see what boost i was running, i achieved 7 by doin the high boost mod form the to do section on here, and that made it 7 psi, i thought that could have been the problem so i reversed what i did today ,and it still does the same

[Rolls]

that is also in mmHg afaik

[soultz]

my cluster has engine temp, oil pressure, tacho and speedo thats it. the ggauge i bought has psi/vaccum level and it says 7 on there

[soultz]

and fuel level sorry ^^

[Rolls]

In that case I suspect air leak, get a smoke test done at a workshop, and get them to check all error codes with a consult cable.

[soultz]

Can do. I was going to put it on the dyno on Tuesday and see air fuel ratios...

[arrydjay]

ok.....so it seemed like the problem went away but it is now back...

I tried changing the plugs out too some .8 gapped copper plugs but it is still there.

I have found that the problem is worse when going around big sweeping corners or up hills...weird..

Ive also noticed it isnt only up high in the rev range but also down low...like the moment I jump on the trottle it starts to cut...

Next step is to re solder the AFM and clean with contact cleaner

Any ideas what else I should try?

[Rolls]

Consult cable.

Take it to a workshop.

[arrydjay]

I checked the fault codes and it was just flashing 55 which means no errors... A consult cable couldnt tell me anything more could it?

[arrydjay]

its also gets heaps worse if I turn the boost up at all...

[DVS JEZ]

New coilpacks or running out of fuel.