Crazy Idle Surging When Engine Warm

[Guest INASNT]

This idle situation is really starting to piss me off!

After putting in 550cc injectors, 044 pump, pfc, new clutch and flywheel i am getting this weird idle when the car is warm.

The idle surges from around 2000rpm to 500rpm up and down for about 30 seconds and then stalls. When i restart the car the idle stabilizers for about 5 minutes and then it will do it again.

I checked the z32afm plug, the afm it self and cleaned the idle control plugs but to no luck.

What else could be causing this??

[B-Man]

Sounds to me like a dodgy AFM - Have you got another one or stock one you can try as a test ?

Did you check all your wiring after you found that other problem when were swapping PFCs etc ?

[Guest INASNT]

i sold my stock afm and havent got another z32 to test! might have to do that!

the pfc problem was because i didnt have a constant 12v supply coming from the battery to the pfc, we passed a new source for that and the pfc work without problems!

[Anquetil]

Mine also has a minor surge on idle as well.

Though no where near as viscous as yours by the sound of it, but it was suggested to me it could also be the AFM or my aftermarket BOV.

[Guest INASNT]

I am running the stock bov still

its alot worse than yours shane, the whole engine shakes and stalls

[Anquetil]

INASNT, where are these idle control plugs? Its worth a shot I spose...

[Guest INASNT]

i think thats what they are called.

two plugs that plug on the outside of the intake plenum

see attached pic

[CS_180]

I'm guessing the PFC was tuned to a z32 AFM

MAybe the PFC is reading the wrong a/f ratio's....

Just a guess......

[Guest INASNT]

No it was all lightly tuned till my new turbo goes on!

The stock oil pressure gauge drops right down when the surging starts 2

[Al]

Sounds like you need to tune the PFC a little more. The mixtures could be too rich or even lean. Take it back to your tunner and tell them to play with the idle a little.

My Wolf 3D was surging/hunting and also stalled, the first time i got it back from the tune. Went back to EAS and within 10 mins it was perrr ing .

[KamikazeR33]

sounds more like constant power isnt getting through because something is overheating.....

just my guess since the oil pressure is dropping - the pump would lose power

[MicK51]

After putting in 550cc injectors, 044 pump, pfc, new clutch and flywheel i am getting this weird idle when the car is warm.

Did u get a lightened flywheel? They can cause a lumpy idle.

[paydro]

i had the same problem in a 31 and later found that a vac pipe had been taken off and change around with something else i think it happened when i had my car checked out at a shop

[Guest INASNT]

Originally posted by MicK51

Did u get a lightened flywheel?  They can cause a lumpy idle.

yes but it aint that as it come and goes, and when i turn the ac on the idle will stablise abit but then start to do stupid again.

I think its either the z32 afm playing up or a vacuum leak somewhere!

[sfitzy]

are you guys running unsheilded pods? Cause I change my pod back to the standard box with intake and the idle has really improved. I put it down to the turbulence caused by the clutch fan at low revs.

[Guest INASNT]

my pod had a heat shield around it! nothing to do with that