DTMeyer

I am looking at buying an H22 5th gen Prelude and it has a P401 error code when I hook up the code reader. I have heard that this code corresponds to carbon buildup in the EGR valve. Is this true? The seller says that it misfires occasionally on cylinders 1 and 4 and I was wondering if the carbon in the EGR valve could be causing the misfire or if it is a completely unrelated problem. Any help would be appreciated, Thanks.

97PreludeDOHC

Dude,

I have the exact same issue. Just Fixed it 100 %. on my 97' Vtech.

The intake manifold egr ports are very small inside the intake manifold.

After 100,000 miles, Carbon builds up in these ports and on the EGR valve.

there is a Honda Tech bulletin out on it.

The EGR Valve recurculates fome of the hot exhaust gasses back into the intake manifold to get mixed with the new fuel mixture.

This "reburns" some of the exhaust and lowers emmissions and NoX levels....

Exhaust is dirty and has gunk and carbon in it from burning hyrdocarbons.. this cloggs up the ports in the intake manifold and causes your mixture to be off and your engine to idle rough and even possibly misifire on one or more cylinders..

Depends on how bad they are blocked and how much of the mixutre you are missing to make a good ratio for a good burn on top of the piston...

It could even gunk up your spark plugs and cause a misfire. have them chainged with the Honda factory Platinum NGK Plugs...


This also pushes out of the way some COLD fresh air that could be burning with the 94 octane Shell V power u just put in... robbing you of V tech power!!!

So

Make or purchase a ERG blockoff kit.

Or remove and clean the EGR valve and drill out the intake manifold port plugs and remove the carbon buildup as per the tech bulletin.


CEL 401 goes away.

no more engine light.
engine idles smooth
accelerates ..

pull radio fuse 7.5 amp under the top left fuse panel under the hood after you block it off to reset the ECM.

I just pulled my CEL codes after the mod on my OBDII code reader.. after the modification. "No Error codes found"

Sweetness...

Check that oil. V techs Drink it!!!!

DTMeyer

Cool, Thanks for the information!!

Kronn 98SH

You have a 14-year-old telephone that requires motor oil? Odd.

OP, I'd be weary taking advice from someone who doesn't even know their own vehicle.

__________________
1988 Prelude S - victim of an 80mph backflip
1991 Prelude Si - sold
1989 Accord DX - impounded
1998 Prelude SH - totaled on 3/29/12
2006 CRF150F - sold
2006 YZ250F - sold

pIERCE

^I'm surprised to see he spelled "DOHC" right, to be honest.

Guys and gals, it's own your own valve cover(the thing at the top of your motor), "VTEC".



OP--I hope you get it resolved, should be pretty easy.

97PreludeDOHC

"moderator"

"advice from someone who doesnt know their own vehicle"

your are shady man. Cuz I used lowercase letters on Vtech.

Capital or lowercase it means the same thing.

only a condesending person like you or pierce would critique capitalization and try to undermine someones post and say that they dont know their own vehicle because of that.

soooo shady and shows your true intelligence level.

Where is your FAA Airframe and Powerplant license?? do you rebuild Jet engines and Recip engines for a living? probally not. I do.

so if you dont have something positive to say, then dont say it.

this forum is to help others out, not critique spelling.

97PreludeDOHC

@ pierce "Guys and gals, it's own your own valve cover"

"own your own "????

dont you mean "on your own"???

i see you have your grammer and spelling top notch!!!!

Vtech V-TECH VTECH V Tech. its all the same thing.

Variable Valve Timing and Lift Electronic Control

look it up.

bouckarooo

lol do i smell an ebeef?


.....so lemme get this straight, you rebuild aircraft engines and jet engines for a living but you didnt know that VTECH is a cheapo electronics producer and VTEC is a type of variable valve timing?


PS..... how many plane crashes have been pinned down to either your tools or you yourself? Like if you can't spell vtec how do you get all the tool specification and torque values recorded?

Kronn 98SH

Since you want to start this childish crap all because you were wrong, I'll gladly put you in your proper place. First, "your are shady". Nicely done.

Second, the word is condescending.

Third, the word is grammar.

Fourth, and the original point, which you clearly missed TWICE, the word is VTEC. There is no H. This is why I said you don't know what you have. Vtech is an electronics company that makes crappy games and phones. It is in no way associated with our vehicles.

So, is Vtech the same as VTEC? Not even close. Have a nice day and enjoy your slice of "shut the hell up you stupid nooblet".

__________________
1988 Prelude S - victim of an 80mph backflip
1991 Prelude Si - sold
1989 Accord DX - impounded
1998 Prelude SH - totaled on 3/29/12
2006 CRF150F - sold
2006 YZ250F - sold

DNick

You know, in a lot of forums, you can "positively rate post", or thank the poster. Not on this forum. So I'll just have to do it my self.

Well done sir......Well done!

__________________
98 Prelude

pIERCE

Well I did spell "on" wrong, he got me there.


DOHC--Dude, I'm really not trying to be mean, but it really is spelled out to you on your own valve cover.

How could you spell it wrong? You're a "jet engine builder", I'm assuming you had to jump through some hoops to get there, but was common sense ever a test? How can you rebuild jets but not spell a word correctly? That makes no sense at all; that's like saying you can rebuild the motor of a car but don't know how to change a tire...

usmcmarc

Whats an EGR blockoff kit?

pIERCE

It's simply a plate that is cut to the shape of the EGR valve and put in it's place to remove (or "delete" as some call it)the EGR from the system.

However with the stock ecu you'll get a CEL, so many people that do this are also running tuned ecu's or standalones.

MisledYouth bb6

^ Simple and right to the point.

__________________

-=MsldYth=-™