could be an vacuum probleem since the ecu is reading vacuum.
but let us know if you find anything .
i really din't have te problem when the jrsc wasnt there and if i open the bypass valve the probleem seems lesser.
my best gues has to be a fuel problem but i don't know where it comes wrong.

greets and keep us informed

 

change your spark plugs

 

I just changed my sparkplugs about 200 miles ago

My vacuum is at about 17-18.

Again, took a look at it, when the engine is cold, it's just fine, once it reaches it's normal temp, then the idle goes whacky again.

I'm still fiddling around with the hoses... as soon as I finish Ninja Giaden, I'll get right to it..........

 

my idle fluctuates smoothly, but only when its cold.

gangster: if it is fluctuating violently, try checking the coolant level, if it is low, it will do this, happened to me.

adding coolant fixed my violent idle fluctuation, now its back to just fluctuating smoothly when its cold.

Frustrated

 

my spark plug gap is at .35 for 6psi. is that ok? also for the soapy water... do i just pour it over the couplings, to see if it bubbles?

 

i tell you what i just put hondata on my car with 440's ray, and my idel is jumping around as well. now hopefully this goes away with some tuning.

 

Great news for me guys!!!!

Well this afternoon i tackled the idle surging problem and with the soapy water carb and choak cleaner i went to town and sprayed down all the fittings, around the whole manifold, the throttle body and everything that could possibly create a air leak.. with no results.

Than i checked my coolant level and that was fine aswell, after that i checked all of the bolts on the intake manifold and throttle body to see if they were tight and make sure i didn't miss any bolts while i was torquing them down on to the manifold, all the bolts ended up being nice and tight.

At this point I didn't find any vacum leaks or loose bolts so the search for the problem was still on, after this i decided to pull of the IACV and clean the screen out with some brake parts cleaner which I did and that didn't solve it either..

Finally with the intake pipe off of the t/b one of my friends noticed a 10mm bolt missing from the Fast idle valve underneeth the throttle body. I pulled the throttle body off to take a better look at it and sure enough i was missing a 10mm that holds the fast idle valve to the t/b.

So we pulled the throttle body off put a bolt in it and bum!!!! Problem fixed...

After all of that time it did end up being a vacum leak, it certanly wansn't expecting it to be underneeth the t/b but I'm very glad i found it..

So guys before you start replacing your IACV's check and make sure you don't have a vacum leak, if you don't have a vacum leak take off your fast idle valve shake it, if the inside rattles, it went bad!!

As for a bolt missing out of my fast idle valve I have no clue how that happen because i never remember taking it off or messing with it at all..

So once again here are the fixes to this problem.

1. Low coolant level, air in the cooling system.
2. Vacum Leak in the maifold t/b, injector area
3. Fast Idle Valve went bad
4. Dirty screen in IACV
5. Bad IACV in this case thou the motor would make a quick 400rpm surge.

Hope this helps guys and good luck!!

P.S when my car was turboed I had the same problem and i never dropped a pound of boost, so don't think there is no way a air leak would cause this problem.

 

Thanks for the info. I'm gonna tackle mine today hopefully. My car dosen't have a fast idle valve so I'm going to look for something else that could cause and exhasut leak.

 

i dont think you wil see bubbles becaus youre sucking air in and the soapy water too.

still have the problem and i still haven't found it

 

Check you fast idle valve under the throttle body, that usually causes that problem, inside there is a thread plug that can come loose. It can be threaded back in and sealed using lock-tite.

 

Not all cars have a fast idle valve. Since mine dosen't I decided to check something else out. I let the car sit over night so it was completly coo and then I opened up my radiaotr cap and noticed my coolant level was a lil added as much as it would take put the cap back on strated the car and wala problem fixed.

 

I am having the same problem as all of you, and mine is pretty violent. its going from 1k to 3k. at fisrt I thought my tb was jacked and changed it to a newer one but that didn't solve it.

I unplug my IACV and the idle drops immedeately to 500.

does this mean the IACV is dirty or bad?

my vac reads 20-21 so I am pretty sure I dont have a vac leak.

 

If your idle is really violent I would check the following things:

Coolant level, make sure its topped off.
Vacum leaks on and around the intake manifold
Take the Fast Idle valve off and shake it, if it rattels, its bad.

 

hmmm... well its lookin like its either coolant, or iacv... Ill let you all know in a bit.

 

ok... so I took the iacv off and sprayed it out, bunch of **** came out I slapped it back on, refilled the coolant and it wend down 500 rpm's but its still doing it.

I am using a pretty shitty intake manifold gasket, and it never leaked and I never had a problem with it until I put the turbo kit on. it started doing this after I went into boost after like the 10th time.

any suggestions?

 

is this on a b16a or a b18c engine? Do you have a fast idle valve underneed the throotle body?

 

I dont have a fast idle... its on a b16 but I dont have a fast idle valve. the only thing I havent done is the intake mani gasket.

 

Ok, you definitely have a vacum leak I'm willing to bet on that!

 

yeah I am thinking the intake manifold gasket.

off to kragen I go... Ill let you all know what hapenes.

 

Got the gasket... off to work I go! wishe me luck!!!

 

FAWK!!!!


no luck. I am going to try another throttlebody now. ohshit I forgot water!!!

 

dude!!!!! WTF!!!


ok I checked all the vac lines, water level is cool, all the gaskets are good, the iacv is cleaned. water is going through the iacv.


could it be a shitty hondata base map?

I got it from wiredspeed. its a b16a t3/t4 440cc injectors, stock fuel pressure.

I dont get it. anyone have any other ideas?

 

i got the same problem overhere checked everything but the problem stay's.
do you have a apexi ???? try playing around with that i dont have one so can't try it.
keep us up to date i really hate that little idle bug

 

nope just hondata... s200 w/boost

 

If you look in your Helms manual, there is a test you can do to test if your IACV is working properly. My buddy had an idling problem, and we went through all the troubleshooting steps (If you want to find a vacum leak, spray starter fluid around the area you think there is a leak, and the engine should idle high). Anyways, after all this messing around, he finally bought a brand new IACV, and it worked! But his car wasn't throwing any codes before. That was what confused us.