Help!! Air flow? Fuel Pump?

[R32DIRT]

Hey Guys.
I have a r32 4 door race car running an 25de neo im having problems with it and cant seem to figure out what it may be
it will idel fine and some times ill get a full race out of it other times it idels ruff and it will be going along then die then boot back up then die its the same feeling as when your driving along in a manual in gear then turn the key off then back on then off for a few seconds then back on can anyone help?? cheers

[R32DIRT]

???????????

[Nismo_line]

got a video?

[ToroGTS]

Possible break is solder behind connector (within sensor) in MAF, disconnecting/reconnecting intermittently.

[anthony]

maf or the idle control valve needs cleaning, o2 sensor?

[nick-nismo]

happened to a friends car,
the negative battery terminal connection was lose.....

[R32DIRT]

ill try upload a video in next couple days it only dose it when car is hot an when its playing up sometimes it will idel swret as just do it when u rev it other times it will keep stalling but it will allways kick over when restarted current maf thats in the car is dirty wasnt sure if that would make a differacncr cheers for the replys guys

[Voodoo_ChildR32]

I had a similar issue with my R32 GTR, wound up being the OEM fuel pump relay. My car would just randomly die in traffic (rather unnerving in the middle of an intersection) and the start up again. I hard wired my pump to constant 12v and bypassed the OEM relay and installed my own new relay. Been trouble free for almost a year now.

[Nathyne]

My car was doing this ended up being a poor connection at the positive battery terminal. Also it did it more when warm i would when it is running wiggle the battery terminals and connectors just after them and see if you can make it stall


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[Skym]

Hardwire fuel pump first (eliminate it as a cause), check battery (as mentioned above), check that alternator is charging.

MAF / AFM can be checked on bench via multimeter, blowing on hotwire inside round part of MAF / AFM. Clean hotwire with CRC MAF cleaner.

R34 NEO engines are known for problems with CAS (front of camshaft to CAS joint wears due to loose cambelt), so check that.

Put car on a dyno and monitor fuel pressure (drop in fuel pressure can tell you that fuel pump is not providing enough fuel), datalog sensors (MAF, TPS) via Nistune tuning software (also check for sensor error codes).

If run fuel tank low, it may be causing fuel starvation problems (need a surge / collector tank in trunk / boot).