R33 Suddenly Shuts Of While Driving

[sonicz]

Some days it will drive for hours with no problem. Other times it will shut of 4-5 times in the space of a minute. There is no warning when this happens and you literally do not know 1 second beforehand. There is a very slight engine stumble sometimes but 99% of the time you cannot regain it even if you floor it, it acts like a kill switch. You can shift to neutral and restart the car. It may drive for hours or switch of 1 second after you restart it.

What I have done so far.

Replaced fuel pump and fuel filter with brand new units

Changed spark plugs and checked coils.

Checked some vacuum lines

Cleaned MAF sensor

CHanged Crank angle sensor (its a the black plastic unit from a R34 with the half moon because its a late series 2 aka series 3)

The car is fitted with both an immoboliser and turbo timer. I suspect these may be a culprit. Any common fault I should check before I pull these out?

The car is a late 1998 R33 gts-t.

[scotty nm35]

What fuel pump did you use? Was it hardwired through a relay?

[DVS JEZ]

Have had a similar issue with my car, ended up being the turbo timer intermediate loom that goes between ignition switch plug

[_x_FiReStOrM_x_]

MAF can definitely give this sort of symptom too. I would swap it with a known working one before pulling apart too much else in the car.

[Missileman]

When mine did this I checked ecutalk and the only fault code was 12 MAF, re-soldered the pins inside and haven't had a problem since.

[sonicz]

thx guys. if its a maf problem will the fault be logged? no fault codes came up on ecutalk.

guess first step to take the turbo timer out.

[_x_FiReStOrM_x_]

It won't always be logged. Only if its way out of range, or open circuit.

[2.5T_/<ouki]

I had a problem like this but it was after i changed my turbo inlet pipe. My MAF was suffering from reversion BIG time cuasing it to spazz out and shut off. I could almost ALWAYS make it shutt off while going up a hill and then pushing in the clutch to let the RPMs drop.

[gtr.nation]

Having exactly the same problem with my 2jz stealth.
Does the fuel makes a loud whining noise ? is the fuel pressure dropping ?

Check the fuel pump wiring, check if the voltage is dropping.

[sonicz]

Ok guys after taking out the turbo timer and immoboliser, the problem is still exactly the same, which is a shame because now those units have to go back in and it was all for nothing.

Scotty nm35, The fuel pump is this one http://www.ebay.com.au/itm/Performance-Fuel-Pump-Skyline-RB20-RB25-R32-R33-R34-/120568439688?pt=AU_Car_Parts_Accessories&hash=item1c12706388

The relay used is the same as the stock unit. Only the bracket had to be really modded.

GTR nation, the old fuel pump DID make a whining loud whining noise, the new one does not. Have not monitored fuel pump volatge when this happens. Would need some kind of digital data logger as it may take as long as a day to turn of and you cant keep your eyes glued to the multimeter.

I am going to try a new MAF unit next but its very frustarting. Should have taken firestorms advice but it may end up doing the same thing with a new maf. Guess it was the easiest thing to try first though.

Edited March 20, 2013 by sonicz