i have a 00 civic ex with a d16y8 i replaced the stock motor with one with less miles and i got one out of a automatic not knowing that the heads and intake are smaller than a manual one. now it idles funny at 1800 to 2100 rpm. the intake on a auto car doesnt have the ivac motor what can i do to fix it with out swaping heads from the other motor. thanks

 

any one have ne ideas or should i just swap head?

 

those it just idle ruff at neutral or any time that car is not moving?

 

Uhh.. all that stuff should be the same manual to auto. The only thing that differs is clutch + tranny vs tranny.

The bouncing idle probably is the TPS sensor. It probably is reading at too high of an ohm load.

 

search is your friend pass it on

 

maybe O2 or something...iono...doubt it's the TPS though..

 

possibly fast idle thermal valve.

 

Auto Y8's used a 3-wire IACV that is mounted on the throttle body. If you want to use a 2-wire IACV, modify the intake manifold (yes, it can be done since 5-spd intake manifolds started life as an auto intake manifold) and mount one up. Get a 5-spd Y8 throttle body to round out the package.

You have a vacuum leak, which is being caused by the IACV. 3-wire and 2-wire IACV's aren't constructed the same nor operate the same. When you unplug a 2-wire IACV, it's suppose to close down and seal off the air passage. 3-wire IACV's use a rotary type of mechanism which never closes down once unplugged, which means it's always allowing air to run through it. And setting the idle for a motor that uses one vs the other is also different.

 

thanks for the info

 

i just reread the first post. at first i thought it said you had a 94. anyway def. an IAC issue...