Need help! I've spent hours searching for threads that were identical to my problem but had no luck. I swapped a jdm b20b into my 98 ek hatch. Everything is wired correctly (triple checked) but the car won't start., and when it does it goes straight to about 4000-5000 rpm and and then shuts off. CKF bypass done correctly as well as the 3 wire to 2 wire iacv. The motor cranks fine but when it does start up, it's as if the throttle is wide open. I swapped the plugs for the tps and map sensor just in case I accidentally mixed them up, but no luck.

My set up is a 99 jdm b20b with a skunk 2 intake manifold, skunk 2 70mm throttle body, aem fuel rail with fuel pressure regulator, obd2 LS injectors, obd2 LS distributor and a obd2 P75 ecu.

Any help would be appreciated.

 

Put a stock throttle body on the intake with the proper T/B gasket and try again. Also, check your PCV valve and make sure you don't have an internal vacuum leak.

 

PCV valve is brand new. The motor is fresh from hmotors with a full compression/leak down work up. Ill try swapping out the throttle body to the stock one tomorrow as its now raining.

 

Hey thanks for the help. It turned out being an air leak from the intake manifold gasket. It was installed with the proper torque specs, but perhaps it didnt seat right. Got it started up and running solid.