KA-t funcky startup, what is wrong?

[silviamaniac]

My KA-t idle like crap

Here is how it idle, when start up, the idle goes up to 2krpm, after a while, it will drop suddenly, say to 1500rpm but only for a second and it will rev back to 2k rpm, drop and rev repeatedly. when it drops, i hear some "psssh" sound coming out from the exhaust manifold side, i m not sure where it is, but i suspect its from the 38mm wastegate.

my boost gauge read 15vac, my vac line for wastegate is from turbine side to the side inlet of my tial. All other vaccum from fpr thru a custom small manifold. All emission control had been removed. ECCS vac line are all plug up.

I tried to play with my s-afc dec-air function, but the thr reads ****, which is not functional. What is wrong with it, which wire did i hook up wrong? Its been not functional before i hook up the turbo.

I ran a rb20det maf, hook up correctly, tried to play with the in/out value on s-afc but when i flip thru the value, no changes besides when i flip to 00 it stall.

My blow off is to atmos, blitz old school SS, full tight.

I dont know where to start dynosting, pls give some opinion.

[silviamaniac]

to add on,

My o2 is not hooked up to the downpipe, i only hav partial downpipe done. But its connected.

Its a 91.

[Projex240]

umm--i think you posted a q like this already bro.Umm--check the wiring on the maf connection. Also--the o2 wouldnt have much to do with it nor the DP--people run short open DP's all the time.The fact that you have used an rb maf seems kinda funky--are these the same as the z32 mafs?Also--one last thing. You dec air funtion is set wrong. I knwo this doesn help since you cant adjust right now--but unless its zero'd out, it will run funky if not set right. I had mine on when I first installed my afc--the car ran like poop, and i had to take ALL of the correction out for the dec air function.I might add this was when my 96 was still all motor. I never had a prob with my other cars doing this. Check the maf and ace splice connections--but think about this too--the spliced wires wouldnt affect the afc's ability to change settings at the box. It will correct the settings like it should on the display screen--only it wont have the ability to apply what it is changing to the cars parameters., and how it runs.