Just clean the holes from the EGR metering ports into the intake runners.
took me an hour yesterday.
CAR HAS NEVER RAN BETTER.
3 of the 4 ports were 100% plugged up.
the other port was 60-70% plugged.

Here is a good test. Start car and unplug the fuel pressure regulator.
undo the vac. line from the EGR valve and plug the EGR right into the vac. line from the regulator. (giving the EGR valve full vaccum)
Car will stall.
If not (my idle just dropped down low)
Your egr metering ports are clogged.

clean ports making sure all 4 runners holes are clean (carbon was so hard on mine needed to use a drill bit.)

Then clean the EGR valve itself really well.
then retest the egr system.

1997 Honda prelude base with 95K

 

Just to tell some of you why this simple EGR system is important.
The egr system lowers emissions by putting exhaust gases back into the intake manifold.
When 1 or more of the metering ports are plugged too much of the gasses get into the cylinders causing problems in drivability and NOX emissions levels.

Also will hurt milage. I had no check engine light, not too many miles.
after opening it up.... found fixed the problem. When I open the metering plugs, things looked okay. but there is 4 small holes that run from the bottom of the metering ports into the runners.
those were closed up with carbon. thats not good for any EGR system.

Tools needed (for 97-01)
Socket set.
wrenches.
Drill index and drills.
medium slide hammer with screw tip (google it if your not sure)
Hammer
Jb weld
carb cleaner.

1) Remove EGR valve, fuel rail, injectors, IACV valve.
2) Clean the EGR valve inside and out really well with carb cleaner.
3) Locate the 4 EGR filler plugs on the intake (under injectors) That sit right above the runners (there are 6 dowls only need to remove 4)
4) Use small drill bit to drill in the middle of the 4 plugs. Remove shavings as you drill.
5) Pound the plugs down a little bit just till you see them move.
6) Screw the slide hammer into the hole you drilled all the way in.
pulling up hard on the slide hammer bang the slide as hard as you can.plug will come out. do this to all 4 plugs.
7) Run a small drill bit into the runner on each to clean the carbon ( dont turn drill on just push and turn by hand) Drill bit sould go in deep like 2 inches. (note. hole is small 1/3 diameter of a cigarette)
8) when all 4 ports are clean, spray plenty of carb cleaner
into the metering ports and the intake runners.
9) JB weld holes you drilled in the PLUGS. Tap plugs back in, reinstall.
10) Put everything togeater, drive car, then retest EGR function.

Good Luck
Steve

 

Here is a link guys with decent pics.

http://autorepair.about.com/li...c.htm

 

good info how often did you have the 3k hesitation? how long have you been driving on it since u cleaned it? looking at it you may be able to do this w/o removing all those parts.

 

Seems it would hesitate when it felt like it, it was weird.
Ive driven a tank and 1/2 since fixed.
you must remove all those parts to do the job.
I also had to remove the fuel rail studs.

 

why must you remove those parts? it looks like you have access to the port w/o taking them off?

 

You need lots of room.
have you seen a slide hammer???
you also have to drill them.
you must remove all the parts. If you brain is working it should take 10 minutes to remove parts 10 mins to put back together.

 

I had the same problem, plus my car would stall. So I took off the intake completely, and took it to a machine shop to have it cleaned. When I got it back, it looked brand new. I replaced the EGR ports and my car runs great! Gas mileage is also great!

 

Im just buying a skunk2 manifold. screw cleaning lol.

 

Cleaning only takes time, not alot of $

 

one of my egr bolts is stripped...havent even been able to remove...any tips so i can do this?

 

i think i might tackle this 2 morrow. this 3k hates me

 

It has to be the most annoying thing ever.
But it also could be a Bad O2 or fuel system problem. Test the EGR first.

 

know ne thing else u can use instead slide hammer? maybe tap a screw in there? slide hammers are 2 much lol.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by M2B4 &raquo;</TD></TR><TR><TD CLASS="quote">know ne thing else u can use instead slide hammer? maybe tap a screw in there? slide hammers are 2 much lol.</TD></TR></TABLE>
You can tap it, I ended up knock the ports into the intake. What year is your Prelude? If you get a Skunk 2 Intake you will not be emissions legal! I would just clean it. I wasted a lot of money and all it took was a good cleaning, especial high mileage Preludes.

 

I tried not using a slide hammer.
even with it, it was hard.
if you have a welder make your own slide hammer
my Lude is fairly low miler and it was very blocked up egr.

 

i wonder if the $17 one from harbor frieght will do it. i know my ports are prolly full of carbon when i cleaned the egr it was caked on in there. how did u get all the crud out of the ports afterwards?


Modified by M2B4 at 12:15 AM 6/19/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WhiteBB2 &raquo;</TD></TR><TR><TD CLASS="quote">one of my egr bolts is stripped...havent even been able to remove...any tips so i can do this?
</TD></TR></TABLE>


Get an extractor(sp) wrench or socket set.

 

Crud falls into the runners.
kinda scary but the motor eats it up.
meh.
thats life.

 

i cannot get these plugs to budge any ideas? i drilled a smal hole screwed a screw in and am using a slide hammer with the square hook on the screw and that plug wont budge. dont mean to thread jack but since uve done it u might have a tip.

 

Dunno how I missed this thread. Anyway, here's how you do it. The info in the link is for Accords, but the idea is the same. With our cars/engine, you need to remove the fuel rail and iacv as said before.
http://home.comcast.net/~em-engineering/T2T013.pdf

Honda sells a EGR port plug kit which they charge $159 for. Screw that. This lists the kit contents. The main tool I had trouble finding, before finding this was a slide hammer that has small enough thread diameter for the plugs. The one Honda gives you in the kit is an OTC 898a. You can purchase it separately online for ~$30.
http://autorepair.about.com/li...h.htm

When all is said and done, you'll need 6 replacement port plugs which are very cheap. Honda P/N 17199-PT3-AHM.

I'm still waiting for the slide hammer to arrive. Hopefully my hesitation woes will be behind me after this.

 

What kind of slide hammer are you using.. sqaure hook?

 

Well, I was interested in checking my system as outlined above. As I was inspecting my intake, I noticed that I do not have brass caps instead I have globs of aluminum weld. Is this hax from the previous owner, or did some of the manifolds come non-servicable?
It's a 95 Vtec

 

theres a pic of mine any ideas? it looks like theve been tampered with already. M@ i have the same thing as u both my 92 ludes have the globs. i thought the caps were under the globs but i have a hole straight into the runners

 

M@ and M2B4, it looks like previous owners have gone about the wrong approach in covering up those ports. All those doing this fix, please look at my post above about how to do it correctly.


Modified by vinuneuro at 2:09 PM 6/19/2007