candm2000

Hey guys, so i've been reading all the posts I can find about my idle surge and everything everyone has said i have tried just about, i'm trying to see if anyone has any ideas I could try, I have a 2000 Civic EX with a d16y8 with 148k miles on it. I just bought the car, so I pulled a code and it was p0505, I took the IACV out and cleaned it to see if it will fix my problem, no luck at all. So I figured cleaning wasn't enough. I bought a new one and installed it, I had the battery unplugged all night and no change the next morning still running at 1500 rpm. I checked the TPS and it reads perfect, I took off my TB and cleaned it and put a new gasket with it. No luck there, I checked for vacuum leaks and didn't find a thing. So I tried to seafoam the car, no change. I checked the spark plugs and they seem fine, the guy I bought the car from said he just replaced the wires so I didn't bother there. I cleaned the cold air intake filter to make sure it wasn't to bad. I tried to turn the Idle screw all the way down and it didn't do anything either. I also did bleed the cooling system like 3 times now. I guess my engine doesn't have a EGR from what i've been reading and it doesn't have a fast idle screw. I'm sure there's more I have tired I just don't remember anymore. But does anyone have any ideas at all what I can try?

Former User

Does the idle surge high and then low repeatedly? If you remove the intake and cover the top of the throttle body with your palm, can you kill the idling engine?

candm2000

It really doesn't surge, it's just stuck at like 1500 RPM at idle, and I put my palm over the throttle body and it still runs, now when i take my other hand and block off the vacuum line connected the the cold air intake then it dies. EDIT: after I cleaned the TB and turned the car back on there was a check engine light on, the codes were p0505 p1399 and again for some reason p0505.

Former User

There's clearly a vacuum or intake air leak.

The FIA system hose? Post pictures.

candm2000

http://caughtintheriptide.tumblr.com/post/86843124575


This is a link to the pictures you asked for, this was the only way I could post it for some reason. It's the vacuum line with the blue fitting around it. and the second picture is where it leads too.

Former User

Looks like the FIA hose from the intake is routed directly to the IM, whereas it should route first to the FIA valve on the thermostat housing and then to the IM. In other words, you bypassed the valve, sending unmetered air directly from the intake to the IM. This is the cause of the high idle.

candm2000

What is the FIA and IM? sorry to be asking that. So your saying i just need to reroute the bypass and plug it into the right area? You wouldn't happen to have a diagram or pictures to kinda give me a idea?

Former User

I added the diagram to my post.

candm2000

Awesome!! thanks a ton! I'll give it a try in the morning and repost to let you know if that fixed my problem.

candm2000

Now I just need to find where the RA control valve is....

Former User

?

candm2000

What does the RA control valve look like?

Former User

What is an RA valve?

IM = intake manifold

candm2000

ehh, looking at the diagram you posted it looks like from the stock intake the vacuum hose goes into the I think is said RA control valve. Or am I blind and that says something completely different? EDIT: annnnnd yeah im blind.... that said FIA valve....happen to know what that looks like? so sorry.

moss500

The diagram is kinda small. OP is seeing the FIA as a "RA". There's no RA.

Former User

The diagram clearly shows the valve, and I already mentioned that it is located on the thermostat housing.

candm2000

Okay, thank you again! Is there a special hose that is used for this valve?

Former User

Part # 24:

http://www.hondaautomotiveparts.com/...C)&vinsrch=yes

candm2000

Thank you very much, I'll have to buy the part after the holiday. I doubt this is a part store item.

Former User

Are you sure the valve isn't on the thermostat housing? Post pictures.

candm2000

http://caughtintheriptide.tumblr.com/post/86849902910

I'm pretty sure this is it.

Former User

Hard for me to tell by the pictures. Other angles might help.

candm2000

I'll have to do it tomorrow, it's to dark to be able to take a decent picture. Put i'll give it a try.

candm2000

http://caughtintheriptide.tumblr.com/post/86850806495

Former User

That may be the heater valve. The FIA valve is on the thermostat housing. Study the diagram (part #24) at the link I posted.