Hi, I just finish up my B18C1 swap into my 95 Civic Si and it doesn't run like it should. When I drive the car hard or shift at high rpm the car idles stays at 3000rpm when in neutral or when the car is at the stop. I try turning off the car but it still start back up idling at 3000rpm, but after driving for a few minute the car idles back to normal. I am running OBD1 with a GSR P72 ECU. Does anyone know whats going on with my car?

Thanks in advance.

 

Try bleeding your coolant, there might be air pockets. If not, check your vaccum lines.

 

^Bleeding the cooling system is a good idea.

Also check for an intake air leak from the TB and IM gasket and clean the FITV (if you have one) and the IACV.

Any CEL codes?

 

try checking the throttle cable to see if anything is interfering with it. i know this sounds like a stupid idea but this happened to me. btw what bracket/ cable are you using? if the two lock nuts are too tight pulling the cable back you could have a somewhat open throttle at idle

 

lol its not stupid at all I did this to when i did my first B18 swap into my old hatch in high school.

 

Thanks for the ideas.

 

Check your tps sensor possibly too. That gave me a 3k rpm idle.

 

FITV???

 

this also happen to me a couple weeks ago when i swapped the B18c1 in my del sol. it would rev a three thousand b/c the hood would touch the throttle cable. GL

 

Thanks it was the throttle cable.

 

diff check for vacum leak....