cilinderkop vraag (Page 1/2)
Yor61 MAY 22, 02:38 AM
Best forum, newbie here owns a Pontiac Phoenix 1980 with, and here's the thing, an iron duke 2.5ltr engine.

Above the intake manifold are 2 inlets?/ holes in the middle that seem to me to find a way somewhere in the head??? I have the idea that false air is being drawn through these holes because my car idles very badly and when I spray brake cleaner above the sprout it starts to run better.

Question is, Are these air exchange holes for the emisie? Or does it have to be closed by a separate part?

I hope you can help me.

I used to own a Sunbird and also tinkered with fieros at GM The Hague, but that was a long time ago. I'm a bit of a Pontiac lover.

Best regards

Roy

[This message has been edited by Yor61 (edited 05-22-2024).]

Patrick MAY 22, 03:16 AM

quote
Originally posted by Yor61:

Above the intake manifold are 2 inlets?/ holes in the middle that seem to me to find a way somewhere in the head??? I have the idea that false air is being drawn through these holes because my car idles very badly and when I spray brake cleaner above the sprout it starts to run better.



I suspect you have something missing. Can you take a photo? If so, use the Upload Media tab at the lower left corner of the message posting box. (Make sure you are logged into the forum first.)

[This message has been edited by Patrick (edited 05-22-2024).]

Yor61 MAY 22, 05:08 AM
Hello Patrick thank you for youre reply,

The picture is not my engine but excactly the same as i have.
The yellow square is the issue. I have a an emision bracket on the inlet manifold under the carburator where the EGR is mounted on but don't have a cover for over the holes/inlets. If its mentioned to be so i don't know.
Yor61 MAY 22, 05:35 AM
This is the emision EGR bracket. manifold site.

[This message has been edited by Yor61 (edited 05-22-2024).]

Patrick MAY 22, 05:56 AM
I would think those holes in the head are where the EGR assembly is supposed to connect. Is your EGR valve missing completely or what? You can't leave these holes wide open and expect your engine to run properly.

These are images I found online of an '84 Fiero 2.5 engine.



[This message has been edited by Patrick (edited 05-22-2024).]

Yor61 MAY 22, 06:40 AM
I was afraid of that that i have the wrong inlet manifold on the car. I've seen the manifold wich you show and the engine has the same looks as mine. But the manifold is what i can see not covering the holes in the head.

But the car run for almost 12000KM's reasanable properly til it started running misarable. So i demounted the carburator and discovered that the EGR adaptor wat torn and full of rubbisch. Bought the same and i fell in to trouble. Bought even a new carburator because the idle traject was stuffed.

In books and workshop manual i see only the manifold i have so i lost it completely????

old EGR bracket

Best thing to do i know but in this situation, any idea's?

[This message has been edited by Yor61 (edited 05-22-2024).]

82-T/A [At Work] MAY 22, 08:18 AM
Hopefully this helps?

Updated, see below...


Also, the Pontiac Phoenix is awesome... they're rare even here in the U.S.

[This message has been edited by 82-T/A [At Work] (edited 05-22-2024).]

82-T/A [At Work] MAY 22, 08:20 AM
And to be clear, the "nothing" above the EGR port... those are just two impressions. They don't need to be covered when the intake is on. It's just part of the casting. They don't connect to anything and are left exposed.
Yor61 MAY 22, 09:45 AM
O ok thanks, so it can be the inlet manifold gasket? wich i resently renewed, unfortuanly.

If i spray break cleaner in the neighborhood of the manifold it starts to run better. But i'm not sure if it is the gasket or something else.

I replaced plugs and cables. I can change the ignition timing and screw up the throtle screw but no succes. The engine stil runs irregular and plfs in the exhaust.

The car has no motor mangement so it should be not that difficult..........

There is a alu tube between the valve cover and carburator. What is the function of that?





I'm very happy with my car. It is an original dutch car. Came of the boat in 1980 at Rotterdam. I bought is in december 2019
82-T/A [At Work] MAY 22, 11:07 AM

quote
Originally posted by Yor61:

O ok thanks, so it can be the inlet manifold gasket? wich i resently renewed, unfortuanly.

If i spray break cleaner in the neighborhood of the manifold it starts to run better. But i'm not sure if it is the gasket or something else.

I replaced plugs and cables. I can change the ignition timing and screw up the throtle screw but no succes. The engine stil runs irregular and plfs in the exhaust.

The car has no motor mangement so it should be not that difficult..........

There is a alu tube between the valve cover and carburator. What is the function of that?

I'm very happy with my car. It is an original dutch car. Came of the boat in 1980 at Rotterdam. I bought is in december 2019




First off... that car is so awesome... it is PRISTINE!!! So nice looking.

Also, my dad is Dutch, still has his accent after 60+ years of living in the United States. I'm going there next month too... going to see all the awesome sites and get me some pofertjes, siroopwaflens, and a big-ass ricestaffle! So I'm really looking forward to it!


But on your issue, this is key here:

"If i spray break cleaner in the neighborhood of the manifold it starts to run better."


This is definitely an issue.

A member Patrick on here keyed me onto a new product that I'd never heard of. Permatex 80019 Aviation Form-A-Gasket


I have a little pitting on my daughter's intake manifold because we accidentally left it in really heavy-duty engine degreaser and it kind of ate away a little bit at the aluminum. You'll want a good intake gasket, but will also want to coat it with RTV sealant (or the Permatex stuff). When I install intake gaskets, I will typically put on some gloves and put the RTV on my fingers, and then work it into the gasket. I don't gloop it on, but just coat the gasket with a fine layer of RTV on both sides. This has always worked well for me because when compressed, it fills in all the little gaps.