rb20 wont idle

[CFLmmaChamp]

just did swap and it runs great if i keep trottle on her. once at idle is dies within 5 seconds vacuum lines are great, MAF? tps?

[Gabes13]

Hay man, make sure you trouble shoot some other basic things before you jump to replacing some other pricey parts. Here's a checklist I come up with when trouble shoot rough idles:

Make sure you have absolutely no air leaks (by the aac unit, air regulator hose, and j-pipe connector, all blow by hoses are snug, all intercooler couplers are tight, and all intake pipe clamps are tight), your vacuum should be steady between 17-22 in/hg, make sure you're not throwing any codes, if so, take care of them (obviously), make sure your battery is charged and charging while on, all powered accessories are off, then, with a multimeter:

-Make sure the idle contact is engaged on the throttle switch when the throttle is closed; ~8-10v closed and 0v opened.
-Make sure your tps is within voltage range; ~0.50v +/- 0.05v closed and ~4.0v wide opened
-Make sure your AAC is working properly; terminal 1 should have battery voltage when "on", and ~6-7v idling cold, and ~8-10v idling warm.
-Make sure the Air Regulator is not staying open; It should be open/half open at at ~20* C and fully closed at ~60* C. You can check by taking the air regulator off the car and applying battery voltage to the regulator and visually seeing the shutter close. It should close within 7 minutes.

Give that a shot first.
Hope that helps.

[CFLmmaChamp]

can i check these with the car not running or does it need to be running??? sure wish i had someone like you near me would be a killer help.

[CFLmmaChamp]

i am as of now a little in over my head. there is a hose coming from the pipe the MAF is on i just figured that is return air for the BOV do i need that or should i just plug it? another area where im getting alot of vacuum from looks to me like a breather hose on top side of the motor cant figure where it should be headed. no pictures i have found really help me out.

[Gabes13]

You can check some of those things with the motor "not running" but still have to have the key in the "on" position so the harness receives power, unless other wise stated in my previous post.

The turbo intake system is pretty simple:
You have the unit that connects the mafs to your turbo, and on that unit you have 2 ports:
1. is for your blow off valve recirculation and the other,
2. is for one of the exhaust cam cover breather ports.

-If you're running a blow off valve, recirculate it so that it blows air back into the intake system. This air has already been metered by the maf and fuel has already been quantified.
-If you're NOT running a blow off valve, plug this port, otherwise you'll create an air leak and the motor will take in air that was NOT quantified by the maf.

The breathers on the cam covers should all be connected to something. On a stock motor, the connections go like this:

From the turbo intake system, a hose connects to the exhaust cam breather
The second exhaust cam breather breather connects to the intake cam breather
The intake cam breather connects to your pcv valve, which is connected to the upper intake manifold.

[CFLmmaChamp]

okay well i will try these out and let ya know how it goes thanks a bunch man!