i have a jdm b20b runnin on obd2 ls ecu with 40 psi fuel pressure. i have aftermarket headers on a stock ek exhaust without cat. i cleaned the iacv and it has brand new tbs,and map sensor.... my issue is that the car idles a 2 rpm on both cold and warm start. i would love any advicee.. pleasee

 

helppppp!!!!!!!!!!!!!

 

clean the fitv
start car
warm up till fan kicks on
adjust idle screw

 

i tryied all the things you stated and **** is still idling high

 

throttle cable??

 

throttle cablee iss good tooo

 

anyone?

 

you check your Intake and exhaust cams to make sure they centered correctly?

So its just high Idleing cold and warm at a stand still correct?

 

 

Id check the tps sensor and throttle cable again

 

vacuum leak?
check all your hoses and where you intake meets the head

F.Y.I. carb cleaner will make it rev higher when it hits the leak

-Chris

 

bump

 

Is the PCV hose from the valve cover attached to the intake manifold? If it is take the hose off the manifold and plug the inlet to the manifold with your finger. If the idle goes down it is prolly the PCV valve. I know that will make the the car idle high cold or warm.

 

bumppppppp ill check the pcv. buy a carb cleaner and check for leaks. i will also check the tbs once again... i have a feeling my iacv is bad cus its not brand neww, i bought it used but cleaned it out completely.

 

since i changed the iacv dats wen i been having this problem!!!!

 

I dunno if I unplug my IACV my car won't even idle. I don't have the coolant lines going to mine so.....car just needs to warm up when it's really cold.

 

After cleaning the IACV you should reset the idle.

Things to check when setting idle speed:

MIL indicator (no check engine light)
Ignition timing
Spark plugs
Air cleaner
PCV system

Follow these steps:

1. Start the engine and hold at 3000 rpms till radiator fan comes on and let idle
2. Disconnect the IACV and EVAP purge control solenoid
3./4. If engine stalls, restart will holding the gas pedal slightly depressed
Stablize rpm at 1000rpms and slowly release the pedal till engine idles
Do not run any accessories

Idle speed should be:
B18B1 M/T 480 +/- 50 rpms
B18C1 M/T 480 +/- 50 rpms
B18C5 M/T 550 +/- 50 rpms

If nessessary adjust idle speed screw
After adjusting idle speed check timing, if out of spec adjust ignition timing and go back to step 2
Turn the car off
Reconnect the IACV and EVAP purge control solenoid then reset ECU
Restart and idle engine for 1 min, check idle speed

Idle speed should be:
B18B1 M/T 750 +/- 50 rpms
B18C1 M/T 750 +/- 50 rpms
B18C5 M/T 800 +/- 50 rpms

*Note if idle speed increases 820/850 +/-50 rpms (B18B1/B18C1) it means the EVAP system is purging the canister. Raise the rpms above 1000 rpms and let off the gas slowly