Hello, My engine wont idle below 1600rpms. Im having a mission of a time trying to figure out what it is. I checked for vacuum leaks everywhere and found nothing. I re-tightened the int. manifold and t.b. and loosened the throttle cable. The distributor is at full retard and the throttle adj. screw is completely screwed-in. i cleaned and tested the iacv to a 12v battery and it functions(clicking). When the engine idles at operating temp., there is vacuum coming from the top port(T.B.) and nothing coming from the bottom port. When i unplug the iacv connector, the engines CEL will trip a code and the engine will start surging. Im desperate at this point. Been dealing with this for 3 weeks. Please Help.

b16a
ctr slugs
stock ports
s2s1 cams
itr int. man.
64mm t.b.
cold air int. sys.
dc 421 header
custom(n1)2.25" exh. sys.
test pipe
obd0(tuning w BRE)
93oct pump gas
bkr7e-n11 ngk's


Modified by MotorSpecies ver1.6 at 7:59 PM 1/15/2008

 

Check your pcv valve assembly

 

O,Its a new pcv. I also replaced the hose with a clear hose and new clamps .As i look through the clear hose, the pcv looks like its functioning(little bubbles pop directly from the elbow of the pcv). I also checked the lines going to and from the breather chamber box. I inspected the o-ring that is sandwiched between the block and breather chamber box also.It look fine.
any info is greatly appreciated. Thanks

 

you have the wrong TB gasket on there..

 

I do!?!?! Which gasket should i get and could you tell me why? The one thats on there right now is a 99 Si T.B gasket.
Thanks.

 

im going to the dealer for an itr gasket.......
any ideas?thanks.

 

CAREFULLY stick your finger in the TB with the car on, put your finger over the top hole, if the idle drops you have the wrong gasket on there....

i cut my own gasket out back in the day..but try the ITR gasket..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onepoint6i &raquo;</TD></TR><TR><TD CLASS="quote">CAREFULLY stick your finger in the TB with the car on, put your finger over the top hole, if the idle drops you have the wrong gasket on there....

i cut my own gasket out back in the day..but try the ITR gasket..</TD></TR></TABLE>

the idle drops barely(100rpms).i thought the engine would choke out but it didnt?????

 

have you tampered with the little valve assembly under the TB?

ooops look like you said it's new.

i would still take it off and make sure it's tightened all the way in... do you have coolant still running through it or did you bypass it/

 

Are you using gasket sealant?

 

Have you checked the injector seals? Could be leaking around the injector.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MotorSpecies ver1.6 &raquo;</TD></TR><TR><TD CLASS="quote">

the idle drops barely(100rpms).i thought the engine would choke out but it didnt????? </TD></TR></TABLE>

how about the bottom hole?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onepoint6i &raquo;</TD></TR><TR><TD CLASS="quote">

how about the bottom hole?</TD></TR></TABLE>While the engine is running,theres no vacuum coming from the bottom hole when i plug my finger over it. I blocked off the fitv with a plate,paper gasket, and honda bond.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by will_rex &raquo;</TD></TR><TR><TD CLASS="quote">Have you checked the injector seals? Could be leaking around the injector. </TD></TR></TABLE>I will check that

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TrippinBull &raquo;</TD></TR><TR><TD CLASS="quote">Are you using gasket sealant?</TD></TR></TABLE> I am using honda bond on the block off plate i made.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dinko &raquo;</TD></TR><TR><TD CLASS="quote">have you tampered with the little valve assembly under the TB?

ooops look like you said it's new.

i would still take it off and make sure it's tightened all the way in... do you have coolant still running through it or did you bypass it/ </TD></TR></TABLE> its blocked off and the coolant lines are bypassed.

 

I took the pcv valve off. the valve leaks as i blow through the stem. Air flow is regular as i suck through the stem. Im gonna replace this tomorrow.

 

https://honda-tech.com/zerothread?id=2191600
didnt u post this thread? is this the same pic on ur old post of ur intake manifold?
If so that white vaccum cap on the top right its suppost to go your fuel pressure regulator that will cause idleing problems

 

i had a similar prob a while back switched the iacv..idle back 2 normal..

 

So your iacv was bad, huh? Im gonna test mine again ,but this time for the proper resistance instead of 12v power.Sound like a good idea? Anymore info .Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onepoint6i &raquo;</TD></TR><TR><TD CLASS="quote">you have the wrong TB gasket on there..</TD></TR></TABLE>

might be using an obd2 gasket on an obd1 throttle body.

 

I just tested for resistance and the iacv read 13 on my multimeter(specs between 5-18 resistance). Im going out right now to get a new pcv and obd1 itr tb gasket. anymore info.Thanks.

 

keep us posted cuz i have to diagnose my idle problem when i drop my motor back in....

i made a sandwich plate for underneath the TB...im hoping that little part will take care of it..

good luck mang!

 

FITV?

well, i don't know if your car came with one or not, but if you have it then check it out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rickdrizzle &raquo;</TD></TR><TR><TD CLASS="quote">FITV?

well, i don't know if your car came with one or not, but if you have it then check it out.</TD></TR></TABLE>

he's got a block off plate on it...

kind of any easy one but did you clean the screen on the IACV thats on the back of the manifold?

 

I just changed the pcv valve....and it didnt resolve the idle. I also switched the fpr vacuum line from the fuel cut-off soleniod(obd0) to the int. manifold spout(obd1) and no change in the idle. <TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Brick Top &raquo;</TD></TR><TR><TD CLASS="quote">

might be using an obd2 gasket on an obd1 throttle body.</TD></TR></TABLE>Thats true, I remember reading some where that blocking the fitv will create harmonics at that particular spot. ive seen t.b's with those holes filled-in using gasket material.appreciate all info.similar experiences? .thanks.

gonna try cleaning the **** outta the iacv.what a mission!

 

good luck, let us know how it goes.

 

another easy one...any air bubbles in your coolant?