egizzle8

I installed a b18a tb on my y7 and now it idles 2k. There's no bouncing idle or anything. The butterfly is completely closed and still idles at 2k? Whats up? Before I installed it idled normal and I had a normal idle. Any ideas? Maybe just disconnect the battery for a while and reset the ecu or what? The car still drives normal just that it idle high now.

egizzle8

Alright now after I started driving it now, I've got a bouncing idle. Anyone?

99b18

maybe a vaccum line is messed up somewhere??

egizzle8

I did them one at a time. Plus theres one two vaccum lines on the throttle body and you can't really mess them up beng the size of the tubing. Maybe air in the coolant after I took off the coolant lines and put them on the new TB?

Pfieff

Not sure where the IAC is located on the b18 TB, but I know that it is on the throttle body on the y7. IAC issues will lead to bouncy idle.

92b16aTurbo

You could also try adjusting the idle screw on the front of the tb.

743

is it throwing a code? I thought my iacv was going bad but it turned out to be a vacuum leak. The vacuum leak was making the iacv search for a steady idle and after a while the iacv would throw a code and the idle would go crazy. I recommend that you reset your ecu for starters.

this might help you out - https://honda-tech.com/zerothread?id=741561

egizzle8

would a shitty tb gasket cause this too?

743

A shitty tb gasket is in fact a vacuum leak. So yes, if your tb gasket is bad then it is most likely your problem.

FrostySol

yeah, bad gasket or just a bad seal could cause this (i.e. there's leftover silocon or other sealant on the TB or IM) Check it out. also check your coolant b/c that can cause this too.

EE_Chris

Y7 used a 3-wire IACV.

B18's used a 2-wire IACV.

ECU's meant to control a 3-wire IACV canNOT control 2-wire IACV's, and vice-versa.