OK I figured out the wiring issue, it was very stupid and i dont wanna mention it yet until everything is fine.

But now the car starts but still revs (WITH THE THROTTLE CLOSED) up to 5500rpm by itself
I blocked off a few vacuum lines off the TB but nothing, same reving. I am looking for some bolt holes on the manifold now that might have vacuum passages or something. I cant really find and unplugged hoses..but im sure its Gottta be a big one if it can rev to 5500 rpm +.

For the MPFI swap parts,,,,the crx I took the parts from was running fine,,,no high reving or anything like that.

What in the world else could it be....IM positive someone had to of had this happen before...anyone?????

 

did u swap your tps wires? i know the dx sensor reads backward of teh mpfi sensors, i belive you swap the outer wires with each other

 

i would also say... sounds stupid but. make sure the throttle plate is actuallt close on the TB

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by badboyr66 &raquo;</TD></TR><TR><TD CLASS="quote">i would also say... sounds stupid but. make sure the throttle plate is actuallt close on the TB</TD></TR></TABLE>

That's what I was thinking too... I don't think the engine could get up to 5500 with the throttle plate closed.

 

I am blown away too,,,,I switched the TPS wires at the switch again just to double check and same result. So it switched them back. Idle screw on the top of TB is tight how it should be. Took the intake piping off and the throttle plate is definately closed.
ALthough it revs to 5500+rpm...it is a very mellow sound as in it is JUST getting enough air to do so. Because when I manually rev it u can definately hear a larger mass of air going in. I am beginning to think that as strange as it may sound,. it isnt related to the throttle body.
THose vacuum lines that run along the bottom of the firewall, is it possible that if one line if damaged that it is what is causing this very high revving?

I even wired up the fast idle on the back of the intake manifold just now (black/yellow and blue)...and still no difference...I even plugged a few vacuum lines on the tb and it doesnt seem to have done anything.

I am going to try plugging a few more vacuum lines to trouble shoot further as it doesnt seem wiring related anymore..

 

I am going to say vaccum leak, but it might also be misadjusted throttle cable.

Go to the car when it is on and pull the gas pedal up with your foot. That'll tell you if its a misadjusted cable if the revs go down.

 

I understand what u mean...however in this case it doesnt rev down at all......only thing i can relate it to is,,,lets say u really really feathered ur gas pedal just so it would rev....as in almost no air would be entering but it would be just enough to mix with the fuel to rev......it seem like it can only be a vacuum leak somewhere along the line....I will check like crazy....As i do remember one thing...when I was taking my DX intake mani brace off,,,I remember the ratched slipped and wacked one of the firewall vacuum lines pretty hard...maybe thats it..Because it didnt do this before on the DX setup.....and it didnt do this before on the SI i took the parts off of

 

ive had that happen to me before, its always been a air leak somewhere

 

hmmm.. I'm having the same thing happen to me.

https://honda-tech.com/zerothread?id=1424924

You mean you wired up the IACV (EACV)?

I had to wire up mine. Now I am thinking I have a bad throttle body gasket or vacuum leak or fast idle uh? thing (that is on the bottom of the TB).

I am hoping to get it up and running properly shortly.

After it gets running and warms up it'll start revving up and down.

-Shane

 

ya I am thinking it is a wacked line or something that I might have damaged accidentaly when I had the extension on the ratchet when I was trying to take the manifold support bracket off...I will definately check that out further...
And the EACV..closer to TPS....was wired correctly...I was talking about that fast idle valve(lower rear of the intake manifold) that some si manifolds have and some dont....it is the equivalent to the dx's tandem valve I believe....but anyways its the exact same wires and its the same pins (orange goes to blue......black.yellow goes to black yellow)..I wired this up just to see if it would make any diff but none....its gotta be something like the lines on the bottom of the firewall as EVERYTHING I can think of is plugged in to the intake mani


But really...5500+ rpm...thats one big *** leak somewheres

 

i am told by a really smart honda guy that its the fast idle valve on the bottom of the TB and the cork fell out....I will definately try that when i get home from work ....fingers Xsd

 

Thats what I am thinking. I need to see how to adjust that now . And that is very common. I think people generally screw it all the way in.

 

OK I honestly tried EVERYTHING!!!

I even blocked off the 2 round ports of the eacv, then the one port on the FIV,,,and nothing, no results. I went a step further and put tape over all of the exposed bolt holes, and I also checked the pcv valve hoses and they are connected. Disregard my "bottom of firewall"vacuum lines as those are brake lines lol.....but what i did was I put tape over the first port that bypasses the throttle plate...no result......so then i went a little further and taped paper over the throttle body opening....and believe it or not...no difference...
This is what happens when i start it up,,,my foots off the gas, the throttle plate is closed....car revs right to 4000rpm then at a relative rate revs up to 5500+ rpm BY ITSELF.......I even switched the Tps wires AGAIN....and no difference....what in the hell could the air be entering....This couldnt be happening from a leaky intake manifold gasket could it?????Mine appears fine and is bolted down tight,,,so I honestly do not know where air could be entering from


***********There is one thing that was in the back of my mind but I dont think it would really be possible..ok here it goes....when The DX intake was off, I sprayed throttle body cleaner into the heads intake ports....is it possible some carbon could be holding a valve open?????but still even if it was.....where would the air be coming from???

 

throttle body gasket. thats what I am going to change today. Hoping it'll solve my curse.

 

I just plugged every single vacuum hose from the intake and throttle body, except for the fuel rail one, but now it doesnt jump right to 4000+ &gt; 5500...it goes right to 3000rpm and almost stays there for a little bit and now im burning a lot of blue smoke(hopefully thats the tb cleaner I sprayed in the intake ports.

But I will try to put silicone sealant around the intake to head ports to make sure nothing is leaking there

 

OK i bit the bullet today,,,,,I am in the process of changing the intake gasket....
I remember installing the intake the first time but I tightened the rear brace first and then bolted the intake to the head....A VERY BIGG NONO...because as soon as I took the top bolts that go to the intake off,, the bottom intake bolt and all of the other ones were very loose due to the angle they were at before...which is definately why I was getting a vacuum leak... But anyways I am doing it right and cleaned both mating surfaces like crazy and tonight I will fire it up.....there is honestly NO OTHER possible entry for the air except for the gap that was created by tightening the rear brace first...so Im pretty confident my problem is solved

 

ok not trying to jack you thread but to billow in similar sorrow .

I replaced TB gasket, checked to make sure the IACV works (making sure it makes a clicking noise), tightened Fast Idle Valve down, double checked vacuum lines.

Nothing.

Same thing.

I am going out there with some carb cleaner spray my lines down and see if I have a leak.

After all of this I will check the TPS. Don't feel like dealing with wiring right now.

-Shane

 

Just sprayed carb cleaner all over and when I sprayed it by the intake manifold and cylinder head it brought the rpms down. Meanin I have a intake manifold gasket leak. One of the nuts were loose!!! So that freakin sucks. I tightened it down brought the rpms down slightly but its weird cause if I spray it by the bolts nothing but near the fuel injectors it'll affect the rpms.

I'm going to try something and see if it fixes my problem. I'll let you know.

-Shane

 

YES!!!!! finally no more high idle...runs wikid now. Turns out it was the gasket and the way I installed the rear manifold brace....this time I only managed to get one of the 2 bottom bolts in but I have the 2 top ones in and I think this should be good.

Also this swap is sweet...didnt really notice any difference until about 3500rpm and that cone air filter I have wistles like crazy.,.....Seriously.....from like 4500rpm its like I have Vtec..I swear....it just comes to life with this h22 sound...wicked stuff.....can only imagine how it will be with a new cam as I have the puny worn old d15b2 cam....
\
\anyways there is just a little issues I have to take car off...like when its warming up it revs to 2000rpm which makes sense but then when it is supposed to level off,,,,it just bounces from 1000-1500-1000-2000-1000-1500-1000-2500-1000 and so on.. but aside from that good thing I used shielded wire on the CPS wires ...I also used shielded wire for the 2 additional a3 and a7 injector wires...it seems to work awesome....thanks


Not bad eh.....good thing I had the itch to take off the intake and get the new gasket in there......Alll done on my 18th Birthday..yeah....best present ever..ha