Fuel injection Port BLOCKED SOLID ! ! !

[WingZr0]

My engine combination is

~N42 Block

~N47 Head

~Japan N47 Intake Manifold

~33306A Exhaust Manifold

on a Fuel Injected 1977 280Z 4 speed

OK,

Some of you may know I made mention of my #6 FI Port being clogged

a.k.a. not getting gas.

Well today I decided, since I'm saving money for a clutch, to take off the

back half of the fuel rail connecting the number 4, 5 and 6 FI Ports and

see if I can can unclog #6 with Chem Tool which I think is called B-12

(Some sort of adhesive, PCV, carb cleaner)

After taking off the rail I could see down into the 4, 5 and 6 ports and saw

that number 6 had some blackish wool like stuff in it.

Looking at #4 and 5 on the other hand I saw only small amounts of the black

stuff wear the top of port mets the cylinder head wall which had what

appear to be razor slits.

On the bottom of the port tube is a Silver Ring Arch shape on the cylinder

head wall with a hole underneath it (kind of like a bridge) that I

assume is wear the Air intake is but at the same time allows gas from the

Fuel Injector to fall in and mix with the air in the combustion chamber.

Ok, thats what numbers 4 and 5 look like but in the number 6 FI port, after

removing the the blackish wool stuff, all I saw was the right half of the

Silver Ring Arch hiding behind the bottom left hand side of the FI Port tube

leaving no place for the gas to go except straight into the side of the

cylinder head wall and the razor slit things :hurt: !

Taking off the first half of the fuel rail to look at numbers

1, 2 and 3 FI Ports I can see they all appeared same as 4 and 5 with a

hole under the Silver Ring for gas from the injectors to go through.

I assume this is how they're supposed to look?

Each hole under the Silver Ring Arches get slighty off bottom center of the FI

Port the further you go away from the middle of the cylinder head.

I sprayed the Chem Tool in all ports and #6 didn't drain down into any hole

only staying inside the port making a puddle of liquid.

Letting it sit for a mintute or two I loosend up a couple of Intake mounting

studs and the Chem Tool drained but I believe it was only between the

Intake gasket and cylidner head wall.

The Chem Tool still drains even after tighten back the mountin studs :dead:

All the Intake manifold studs line up correctly and go in and out with ease so

what is causing my Fuel Injector Port / Ports to not align?

Thaynx for ANY help at all on this.

~Z~

[sblake01]

I'm having a little trouble with your terminology. Such as, "cylinder head wall", "razor slit things", "Silver Ring Arch", etc. If your injection ports are clogged, the best thing you can do it remove the intake manifold and clean them, or have someone do it. Since you "loosend up a couple of Intake mounting studs", as you said, I hope you realize that you're now going to have to remove both the intake and exhaust mainfolds and replace that gasket evidenced by the fact that it "still drains even after tighten back the mountin studs". That's telling you that the seal has been compromised. I doubt that your ports don't line up, they just need to be cleaned. Hope you haven't gotten in over your head on this one.

[WingZr0]

I'm loading a JPEG drawing now. Give me a sec.

[WingZr0]

Hope you haven't gotten in over your head on this one.

Nope

I do relize I need a new gasket now.

This hole is on the outside of the cylinder head right at the same place each Intake Manifold tube connects, i.e. where the Fuel Injectors sit above.

All the FI Ports has this hole at the bottom of the port except for #6 .

In the Drawing below,

Black is the inner walls of the Fi Port as your looking down into it.

Dark Grey is the outside of the Cylinder Head on the drivers side.

White boxes are the Razor Slit looking things.

Light Silver is the Siver Ring Arches

Blue is the hole under the arch falling into the combustion chamber.

Drawning of port at this link....

http://i170.photobucket.com/albums/u280/Wingzr0/1%20pics/FIPort.jpg?t=1192979781

Ports 1 through 5 look like this but slightly off centered while on the number 6

port all you see is the top right half of the Silver Ring sitting on the bottom left of the port with the hole out of view trap between the Intake Manifold flange and the gasket.

I'm just assuming this is where the hole leads to, but I am ready to go that extra mile and take this N47 head of the engine block and go through this thing up and down if need be.

I like to know what I'm dealing with first so as not repeat a possible problem I may or may not have

Just don't understand why all ports look the same when one does not.

I'm I missing something here on this?

I'l take pics of the ports latter today if that helps and hopefully get them uploaded, if not tommorow morning.

~Z~

[WingZr0]

Oh yeah, BTW the gasket is made out of rubber if that means anything.

As well as the Valve Cover and Cylender Head to Engine Block gaskets.

[WingZr0]

Going out to take pictures of all 6 FI Ports rIght now and get the

pictures up later today, so hopefully this will help in my description.

Taking off the Intake and Exhaust Manifolds while I'm at it so hopefully

I can see whats really going on behind the drama.

Yakin off the Cylinder Head tommorow if need be and check the pistions for

this "Carbon Build Up" I've been hearing about and clean it.

So Big day off work for me today and tommorow and lots of time with my Z

and phone calls to MSA

WOO HOOOOO !, I LOVE THE SMELL OF OIL AND GASOLINE

~Z~

[WingZr0]

OK,

Heres what #6 FI port looks like...

and here is #3.

As you can the Silver Ring Arch I was reffering to is the band of

silver arching ocer the hole at the bottom of the port.

I'm assuming it leads to the combustion chamber.

Ports 1, 2, ,4 and 5 look the same as number 3 does but with the hole on

the bottom slightly off center more and more.

The Silver Arch on Port #6 however is completly blocked off and the hole is somehow between

the intake manifold and the gasket on side of the cylinder head which holds the cam and stuff.

Is there something wrong here and what are those rectangler slits above the hole?

More photos of different enlargments and angles here.

http://s170.photobucket.com/albums/u280/Wingzr0/1%20pics/

P.S. I had to roll the car into the angle of the sunlight to get

these photos right. :rambo:

Oh yes, how do I get the tube going from the exhaust manifold upto the EGR Valve on

the intake manifold?

The bolts holding the tube together seem to be stuck or something, other than

that I got everything disconnected to take those manifolds off execpt for those 1 to 3 bolts.

~Z~

[m4xwellmurd3r]

i'd use LOTS of pb blaster on the stuck ones. I used that stuff today to replace my master cylinder and take off a section of my exhaust. AWESOME stuff.

as for the crap plugging your intake. it looks like the inside of a freakin radiator o_O

[Maddos]

I reckon your manifold gasket is one designed for carby intake. EFI heads have an extra small notch cut out of their gasket to allow for you injector. The right gasket looks like it would make a hell of a difference. Don't know how your car would have ran like this. Swap the gasket and scare yourself with the change it makes.

Congratulations, you've just gained an extra 2 cylinders my friend.

[WingZr0]

i'd use LOTS of pb blaster on the stuck ones. I used that stuff today to replace my master cylinder and take off a section of my exhaust. AWESOME stuff.

as for the crap plugging your intake. it looks like the inside of a freakin radiator o_O

Thyanx , WD40 wasn't gettin it.

Radiator ?

I reckon your manifold gasket is one designed for carby intake. EFI heads have an extra small notch cut out of their gasket to allow for you injector. The right gasket looks like it would make a hell of a difference. Don't know how your car would have ran like this. Swap the gasket and scare yourself with the change it makes.

Congratulations, you've just gained an extra 2 cylinders my friend.

Thyanx for that info, I'll get the ordering that gasket from MSA today

I'd rather be scared the right way then the WRONG WAY

Is the Notch and Squar Slits a part of the gasket itself?

Reason I ask is I'm hoping there not part of the Cylinder Head wall cause that would :hurt:.

To answer your question she ran on 5 cylinders but the idle would die untill after letting it run for

10 or 15 minutes then it would hold (After setting the idle screw at 1,100 RPM :pirate:)

Tach would dorp like a rock once, twice then three times in a row when going from dead stop neutral

into 1st gear under load causing me to get on the clutch so the RPM's would clime by taking the load

off the engine.

Always has the same pattern though, once twice then three times with the Tach, sometimes only

twice in row .

However if I give her just a little bit of gas peddle the RPM would dip from 1,100 to about 800 or

500 then raise back up and drive like normal.

Problem would dissapate some after driving awhile but if I didn't watch it

the Tach could just suddenly drop all the way to zero RPM's locking the engine and car to a dead stop in

1st gear as oppposed to neutral or on the clutch where I would coast.

Needless to say 2 or 3 times stalling like that helped Kill my clutch disc right there over time.

And thats not counting any the PO's and what they did

Yeah, so she ran like a Mac Truck with heart problems :cheeky:

Still lots of power though for a 5 banger :cheeky:

~Z~

[WingZr0]

Just a correction for archive reasons my

Exhaust Manifold markings reads

~3330A

With no number 6 on it.

[WingZr0]

Thyanx Guys!

I ordered the New correct 1977 Intake/Exhaust gaket from MSA and

a Water Temperture Sensor along with some other parts.

Should arrive Tuesday or Wedsneday and I'll let ya know how it turns out.

Thyanx again ~Z~