Rb25 Neo Problem

[datto_sw]

hey guys i have a rb25 neo in my 31 and i just got it wired up, it ran all good for a while but now it idles real bad and just dies, but then when i unplug the air flow meter the idle is fine but its up at 1500 rpm what i think is normal with no afm. So does this mean my air flow meter is stuffed and it couldnt really be any thing else??

thanks heaps guys

[Damo_R34]

clean your afm with some electrical contact cleaner.

[datto_sw]

What just take it out and spay through it?

It all looks band new so dont think its corroded or ne thing.

[Jonnyboy89]

if a 25 neo is like a 20 there is an idle tensioner on the plenum, which alters the revs so im told, you change it by turning it with a screwdriver! had this done at turbo tune by jeff

[Damo_R34]

what ecu are you running and is it a standard afm?

[datto_sw]

ummm nah its got a north to south plenum on it now. and it does ide right for a couple of seconds then starts to die. then i give it some revs so it does die and it struggles for a bit then when it gets to higher revs it seems ok.

[datto_sw]

ummm its just the stock ecu and stock afm (r34). i thought i tcould be some thing else but then when i unplug the afm its fine.

Edited March 1, 2009 by datto_sw

[DSTROY]

does it blow black smoke when it does it?

[datto_sw]

Its pretty much only got the dump pipe from the turbo cos the zorst isnt quite finished. but it doesnt look like any smoke at all.

I though it could also be just cos it doesnt have the zorst on but it run all good for a while with out it (just moving it in and out the drive way). then i tried the afm.

Edited March 1, 2009 by datto_sw

[PREISS]

what ecu are you running and is it a standard afm?

+1

Will act funny if the ECU isnt tuned for AFM.

I put my powerFC back in with standard afm. didnt run right. because it was tuned for a Z32.

[datto_sw]

But cos they are both stock it shouldnt be a problem ay?

[PREISS]

Yep. shouldnt be a problem then.

Well not that problem anyway.

[Jonnyboy89]

i think honestly you may have a boost leak! seams to be the same problem i had! im not an rb wizz but the 20s have a charcoal canister, which has some rubber pipes running to the inlet manifold near the stock bov! i found with mine that the pipes had a split or something, we plug mine up and the car idled better! also you can get it tuned(or remapped ) and have the idle set higher from memory

[Damo_R34]

if the afm is on, and it idles shit, then he takes it off, and it idles, well, better, my money is on the afm. maybe borrow someones working afm and see if that works all connected?

[Dori-Dori]

as damo said, clean ur afm

then if it still does it check it with another afm

if it still isnt working move on to check ur loom, then chack the ecu

if it still doesnt work, get it checked by someone

[Madaz]

i don't know why a NEO would be different to standard 25 but without AFM on mine engine she wont start and if i unplug it while its running it dies

[Boof]

i don't know why a NEO would be different to standard 25 but without AFM on mine engine she wont start and if i unplug it while its running it dies

Exactly what i was thinking Steve....

I'd still be trying what Damo said and clean your afm but i'd be checking to make sure all ur pipes/clamps/etc etc are all connected and done up properly and it is the correct AFM for that motor isnt it?? Is there any difference between a neo AFM and a normal 25 AFM????

[datto_sw]

i don't know why a NEO would be different to standard 25 but without AFM on mine engine she wont start and if i unplug it while its running it dies

My rb20 done the same (stayed on when i unplugged the afm) everyone has told me that the computer evens it self out but ya cant rev it over 3000 rpm cos it dies.

The car goes in to get the zorst finished tomorrow then to turbo tuen wednesday so ill just get them to have a sus.

thanks for everyones helps.!

[r33 chris]

sounds like an intercooler pipe/join, would be over fueling like a bitch tho and if it was that u would notice black smoke, try damos idea he reads alot lol

[datto_sw]

all solved thanks guys! was a vacume leak found it and ran fine straight away!

thanks for all the help!