i have an LSV in my crx and my IACV is starting to go bad. i tried cleaning it and it didnt help. my question is this...
what IACV are compatible?
i am running an obd0 intake manifold on my 95 B16 head. i want to assume that one from an integra will fit. does anyone know what years are compatible?

DA 90-93?
EF 88-91 Si Version?

i know newer civics will not fit because the bolt pattern is different. thanks for any help.

 

del sol vtec

 

ummmm. no.

i said im running an obd0 jdm intake manifold. obd1 iacv have bolt holes that are closer together.

anyway. i went to the junkyard and found an iacv from an HF and it bolted up. but there is a difference. on the inside where the openings of the IACV meets the manifold there is a metal screen on my b16 iacv but none on the HF iacv. i found some DA's out there but without the iacv, but those bolt holes appear to match up as well. here are pics of the HF IACV on my spare B16 mani. i did find a compete LS motor but the car had been covered in mud and moldy like it was pulled out of a river.

 

what exactly is your iacv doing indicating that its failed?

 

my rpm's keep surging starts out at 3K and then as the motor warms up it slowly lowers until it hits under 1K. when i had my old HB with a Z6 same symptoms were fixed with a new iacv

 

ok well sounds like a plan then. just thought i'd ask cause i had a slight surging idle on my car some time ago and it was remedied with a new iacv seal. your problem however is obviously much greater than what i had going on lol.

 

yea, the only question i have is will the metal screen from my obd0 b16 iacv make a difference if i install one from an obd0 d-series or 90-93 iacv from a ls?

 

here is a pic i found online this is the screen im talking about, and its listed for 88-91 civic and 90-91 LS with B18A1

 

ok, so i went to the junkyard and found some iacv's from 88-91 civic/crx that are mpfi and 1 from an 90 B18A1. i only see 1 difference between the 2 types. there are 2 ports on the civic/crx iacv they are both open and the on the B18A iacv one port is open and one port is somewhat filled in (see pics below). will i run into any problems by running the one from a D16A6 motor? the reason i ask is because one of them is near new. thanks

 

i guess the only way to find out for sure is to slap it on and try it out, i have never seen the small hole either.

 

i will start off by cleaning off the one from the B18 then install that one. if my problem continues then i will install the D-series one. thanks

 

so if you can see they white bit its good ?? my one went bad and just waiting on a buddy he has 1 from a carbed 1.5 sohc engine hoping it has the same bolt pattern i had another 1 there but was different bolt pattern

 

I had an idle surge for the longest time that I couldn't figure it out. I am running a PM6/OBD0 ECU-89' SOHC D16. I never looked super closely at the IACV port sizes.

I tried a handful of different IACV's all with the 2 matching port sizes, they all idle surged. Each time I swapped valves I would bleed the coolant system fully again.
And the idle surging would only come on after reaching operating temp. I even tried smoke testing for a vacuum leak.

While setting ignition timing I had disconnected the IACV and noticed it idled super nice, right at 800rpm--but of course leaving this unplugged completely threw the ECU/engine into ultra limp mode under and load (code 14).
What I did for a while was: I drove around with a IACV zip tied in my engine bay to trick the ECU into thinking there was an IACV. This worked fine but I would have to manually hold the RPM on cold start, otherwise the engine would die.

So going down the list of tests and symptoms, all of this pointed towards the IACV being funky. My hunch is it has something to do with the engine not knowing how much air is being metered but idk.
Eventually in a random rotation of swapping valves around, I put in the small diameter port IACV and it fixed my idle surge.