s13 sr20det idle problems after mods

[sr22hatch]

Ok too the point
I rebuilt my whole engine top too bottom. new rings bearings pistons on the bottom end left the top end stock drove the car for 2 weeks or so than I dropped in my fully built BC head with 264 cams, 810 cc injectors, high flow fuel rail, z32 maf , Freddy plenum gt2871r, rs enthalpy tune after all that is done, the car wont idle and dies did a boost leak test fixed a few leaks and still idles like shit worse with the maf plugged in ive tried 3 different mafs 1 being new. my wiring is done correctly by the way. Could it be my iacv ? Or do I still have a leak somewhere on my manifold

Sent my ecu back checked out good so im stuck with this bucket that wont stay on. It hits the 2 step fine. heres a few videos I put on you tube please check them out

Koguchi power s13 in the works: http://youtu.be/_rwnGavDGVA
S13 sr20det idle problems: http://youtu.be/9SBvefU4G5A

[240sx_gus]

ay bro i have a s13 ka24e stock and right now it is idling high after the engine is warmed up it idles at about 1500 to 2000 rpm. do you know wat could be the problem?

[ultimateirving]

Does it idle too low op? And can you keep it idling by tapping the gas/revving? If your iacv is open a lot will make it idle high. There is a process to getting it into timing mode. Also do you have a wideband ?

[jscherf92]

Definitely try a new IACV, they're notorious for causing all sorts of stupid problems. Also double check timing if you haven't already, both chain and cam angle.

[Kingtal0n]

wow, you put a built head on the car with some enormous injectors and expect a mail-order tune to just plug and play?

It needs tweaking. hours and hours of tweaking to be even close. Yes a random rom-tune can flush you out a rich across the board situation but a real tune takes a LOT of time on an engine like that. Your problem could also be related to the valvetrain if you never ran the engine without the huge injectors, such as incorrect cam timing.

To make a rom-tune work even halfway decent you need skills, a wideband, and eyes and a nose. You increase the idle air-flow and watch the wideband as you drop the fuel pressure for a stable idle. If you have to take out too much pressure the ecu needs adjustment. If you get it to idle but it goes lean when you hit the gas the ecu needs adjustment. If you cant get it to idle no matter what you should re-install the factory injectors, and factory ECU and maf, and see if it will run that way, with just the cams installed it should be halfway normal. Those cams are very mild idle characteristic with a nice tight LSA and pull good vacuum at idle.