faxshatch

Ok heres my setup. I have a 99 civic cx standard with the stock y7 with 100k on it. i installed a 98 y8 head with a 99 y8 intake manifold from an auto. i pluged the correct airports with jb weld and there is no vacuum leaks. i am running a 2000 ex ecu from a standard. i repinned the iacv blue/black wire unpinned the orange wire. the knock sensor vtec oilpressure switch and vtec solinoid are all correctly pinned. when i started up the car the idle would surge from 2-3 grand? when the iacv plug was unconected the idle surged from 1500-2000rpms. everything was rechecked at least half a dozen times. So we came up with the idea to swap throttle bodys to one from a 96 y8 with a fitv on it instead of the iacv. the idle doesnt surge now but it skips wen i give it a little gas. The rpms will flucuate from 17-1900 rpms. But wen i give it a little more gas it revs normally. so i tries running the fitv and the iacv. I just took one hose from the fit and hooked it to the iacv and then the other on the iacv to the fit. It will idle really low when i first start it up but then once it gets warmed up it idles at 1000k. it almost wants to die wen i first start it up. But once its warmed up it will rev fine no hickups or anything. the idle adjustment doesnt have any effect on the idle now?? but wen i get onto it hard the rpm flucuation will start again wen i give it a little gas, ill turn off the car and start it up again and it wont do it till i get onto it hard! So please is there someone on here who can help me fix this? What in the f**k do i need to do!!

faxshatch

bumpin come on guys need a little help

ho bag

Well something dont add up here...

Auto y8's still used a 3 wire iacv so how did you make that work on the 2000 5spd ecu?

Are you getting any engine codes?

Also on all the how to's i found the wiring for the iacv was reversed. i had to swap the wires to get it to idle but i was also getting the engine code for bad iacv.

faxshatch

wel the only code im am gettin is a secondary o2 sensor? for the iacv i just eliminated the orange wire and repinned the blu/black wire from b6 to b23 on the b plug. What wires did you switch to get it to idle correctly? Do u think i should just get a 2 wire iacv?

ho bag

You should be running a y8 5spd manifold with 2 wire iac and a 5spd ecu.

Thats what i did and it fixed the same issue i was having as your issue.

I also reused the orange wires and repinned it to the KS pinout on the ecu and hooked up the knock sensor as well.

faxshatch

good idea with the knock sensor! Can i just get a 2 wire iacv and just put it in place of the three wire on the throttle body?

faxshatch

Bump for more answers

ho bag

No you NEED the mtx intake manifold to run the 2 wire IACV.

faxshatch

S**t this sucks i need a new intake manifold? I cant tap the back of the auto one and get a new throttle body? can i run it like the old z6 with a fit valve and a 2 wire iacv?

faxshatch

Yea and driving down the road today the car wouldnt rev past 2500rpms! It would start surging 2-2500rpms. WTF! turned if off started it up and nows its fine again

faxshatch

bump still screwedup want more opions thanks i just dont have any money left

2redstars

your using a auto y8 mani, which doesnt have the 2wire iacv on it, so why did you rewire the harness for it?
what you should do is-
repin it again for the 3 wire iacv(tb mounted one) and run the y7 or auto y8 throttle body
or get a 5spd intake mani and run the 2 wire iacv on the back of it.

also make sure your using the right tb gasket, it should match the tb, not the manifold.

ho bag

You NEED the mtx manifold and 2 wire iacv end of story.

Until you do that nothing else matters.

faxshatch

Pretty sure that i can drill and tap the back of the manifold to mount a two wire iacv and get a manual y8 throttle body. Since i got the tools and it would be cheaper i think thats the way ill go

immajackuup

faxshatch

Thanks!!

faxshatch

Does the manual y8 have a fit valve on the bottom of the throttle body? Looks like it mite. i already have a throttle body off a manual 96 ex so all i need is the 2 wire iacv and some hose! all ive got to do it either mount the iacv to the back of the intake manifold of create a block off plate for the back of it! from the diagram it looks like it will be pretty simple