S13_CA18DET_39F00_MEC-D007D_EDM_MT hot problems

[danishs13]

hey, so im having some trouble with my s13 and im just gettin fed up with it by now to be honest :S

i am still quite a newbie to the tuning world so please excuse any dumb questions

my problem is when i enter hot running conditions, it floods the engine when i let it go down to idle it doesnt catch idle and just dies, and the plugs will be wet afterwards...my afr measured on aem wideband is 14,4-14,7(idle-2800 rpm) when the flooding occurs and the lambda reads 0,99-1,00 so i dont get how it floods...

theres is an idle problem when heating up aswell if i give it a little gas and then let it come to idle it will fall to 500 rpm then catch on again and go at a steady 900 rpm at idle gets worse as it warms up to the point of flooding, and of course i cant really drive it anywhere as it wont fire backup after this happends.

injectors are fine it will hold fuel pressure at 3,5 bar for 10 min after i turn off the car if i clam the fuel return line so they shouldnt be leaky
the engine has been rebuild, so compression, HG trouble and so on isnt an option
CAS splines are fine
new coils and plugs, and spark looks fine (battery is showing 10,5+ volts when cranking)

my mods are:
gt2860rs
444 gtr injectors
z32 afm
hks filter
apex FMIC
apex flywheel
nistune
adjustable FPR (set to 37 psi at idle)
oil cooler
wallbro pump

engine has been honed, acid bathed new bearings all round valves checked and new rings and pistons. new gaskets and seals all round

any advice or ideas would be greatly appreciated

[Hijacker]

Probably in your tune TBH. I'm not familiar with nistune, so hopefully someone who is will chime up. I'm moving this to the CA forums but i'll leave a shadow link so gen chat will till see it.

[danishs13]

shouldnt be the tune, runs fine when cold no problems start till about 45 celsius and the injectors and maf has been changed and afr´s are looking fine? :S

cheers for the input and moving the thread to the right place

[Buddyworm]

I don't think you're flooding. Your IACV (Idle air control vavle) probably isn't working properly, very common problem on these engines. It's the assembly sticking out of the side of the plenum over the injector rail. I'm willing to bet the reason it's dying out on you once the car warms up is because your cold-start bypass valve has closed and your IACV isn't working properly to sustain idle when its gotta adjust the airflow on its own.

Double check that the plug is making contact on the small cylinder with green plastic pointing towards the front of the engine, that's the device that controls your idle under NOT. Failing that take the whole assembly apart and clean it up, interior of mine was all gunked up with black deposits when I did this.

[danishs13]

buddyworm i will try this tomorrow! thank you very much for the input really hope this will help

[danishs13]

buddyworm thank you very much! seem to have fixed the problem

[float_6969]

That was easy!

[Buddyworm]

Happy to help danish!