Fitv adjustment?

Bludge · Post by **Bludge** » Thu Mar 24, 2016 11:08 am

I have just taken apart and cleaned my fitv in the hopes it would cure my bouncing idle. it hasnt.

I know if you screw it in one way it will raise the idle and the other way will lower it, but would that affect the bouncing idle problem i have?

Post by **Merlin** » Thu Mar 24, 2016 12:38 pm

Take your intake off while the is running and block the two holes one at a time and see what happens, like this:

[youtube]wwm0-tlsNHk[/youtube]

If you block the bottom hole and revs drop then the FITV is at fault. If you block the top (IACV) hole and nothing happens you have a vacuum leak somewhere. When blocking the top hole the engine should almost stall.

Bludge wrote:I know if you screw it in one way it will raise the idle and the other way will lower it, but would that affect the bouncing idle problem i have?

I wouldn't adjust that screw just yet, until you have checked everything else first. Also when turning that screw you need to unplug the IACV to set base idle correctly. If you have an underlying problem like a vacuum leak adjusting the idle screw will not help.

Bludge · Post by **Bludge** » Thu Mar 24, 2016 2:37 pm

i havent tested the top hole, but the bottom hole, if its bouncing the idle, when i cover it with my finger the idle stopped bouncing. took my finger off and it bounced again. that means the fitv is at fault right?

Post by **Merlin** » Thu Mar 24, 2016 2:55 pm

Bludge wrote:when i cover it with my finger the idle stopped bouncing. took my finger off and it bounced again. that means the fitv is at fault right?

Yes. The FITV is not closing once the engine/coolant is warm.

Bludge · Post by **Bludge** » Thu Mar 24, 2016 5:32 pm

so adjusting the screw wouldnt affect that at all then? just wanted to make sure that it wasnt an adjustment issue before getting a replacement.

May try cleaning it out again first though.

Post by **Vtecmec** » Thu Mar 24, 2016 5:52 pm

It usually is a problem because it has unscrewed itself inside.. Try screwing the white plastic bit in a few turns.

Bludge · Post by **Bludge** » Thu Mar 24, 2016 11:11 pm

When i put it back together after cleaning it i screwed it in as far as it would go. still bouncing the idle.

GJMHONDA2012 · Post by **GJMHONDA2012** » Thu Mar 24, 2016 11:28 pm

Bludge wrote:When i put it back together after cleaning it i screwed it in as far as it would go. still bouncing the idle.

once u have screwed it right in u will need to turn it back 2-3 turns see if that works, that's what I was told to do if not then I still have that one for sale

Post by **NafemanNathan** » Thu Mar 24, 2016 11:32 pm

How's the gasket?

There's a chance it's beyond repair, although you can potentially pack it out the seal properly. I did this on a 3rd gen one as it wasn't sealing properly, but I've never taken a 4th gen one apart to know if it's similar.

Bludge · Post by **Bludge** » Fri Mar 25, 2016 7:55 am

GJMHONDA2012 wrote:
Bludge wrote:When i put it back together after cleaning it i screwed it in as far as it would go. still bouncing the idle.
once u have screwed it right in u will need to turn it back 2-3 turns see if that works, that's what I was told to do if not then I still have that one for sale

I will give it one more go and if it doesnt sort it i will have your mate, cheers.

NafemanNathan wrote:How's the gasket?

There's a chance it's beyond repair, although you can potentially pack it out the seal properly. I did this on a 3rd gen one as it wasn't sealing properly, but I've never taken a 4th gen one apart to know if it's similar.

Its 3 rubber o-rings and they look in pretty good condition to be honest.