1979 Porsche 928 Intake Project

[jackforey]

Awsome thank you for the info i sent the pm. Do you know anywhere i can go to just get the diagrams for the top of the engine so i can replace the vacuum, fuel, oil, and coolant lines i removed.

[AirtekHVAC]

Yup, I sent the file btw...

Look here: SharkSkin - 1978-80 Porsche 928 Tech Specs Booklet

I got most of my printouts for my homage "bible" here

[AirtekHVAC]

I have actually printed out every one of his "shark attack" write ups and put in a huge binder!

[jackforey]

I actually think I will do the same pending a printer llol, but yes I will use them well llol except mine has a lot more then this idky but it does ill just look up pictures and videos, I want her all done right before I even try to start her.

[jackforey]

Well Finally before I sleep, I was getting the diagrams together to order parts and all and I noticed something on them and most of you don't even have it... its this lieelt thing hanging from the rail going across the engine bay on the left side of this image.

[MPDano]

It's a valve that opens when you turn on when you turn on your AC. It then raises your idle to compensate for the AC dragging your motor to a lower rpm.

[jackforey]

Awsome thank you for the information, Also paint.... Ima leave the center top piece of the spider and its legs silver i like that, but everything else is gonna go black and red like above Black thick hoses and red couplings for the legs, red vacuum and maby paint or buy red spark plug wires, the whole 2 tone black and red car is extremely appealing to me. that picture is my goal with this car.

[AirtekHVAC]

Hmmm, I don't have that valve on my car either....perhaps it was not on the '78-'79?

[neil30076]

Only on an automatic maybe? Or they didn't realize they needed it until later years . Vacuum hose diagrams for 79/80 do not show it, 81 and on does.

[AirtekHVAC]

ahhh, perhaps on autos.....could be....

[jackforey]

Well mine is a 1979 5 speed, and it does have AC.

[vandenham]

I have a 1978 5 speed with AC and it does not have that valve. The AC works and does not affect the idle much when it cuts in/out.

Rick

[jackforey]

I think post of a turbo kit?

[BoiseShark]

No, it's just an A/C part that was mentioned above and 78, 79 does not have it as part of their A/C system.

I'll try to help you out as much as possible with your project. Just take it slow and one step at a time. Dream of paint schemes, but don't waiste time painting right now. work on what all of us have suggested and get it running.

You will need to test both fuel pumps, the first one is underneath the fuel tank and can be accessed by removing the metal "bra" or "girdle" that holds the tank under the car. The second is in the rear passenger side wheel well.

Replace fuel lines.
now that you have the spider off. find vacuum diagram and replace all vacuum lines. It seems daunting, but buy bulk hose...8mm or 1/4 inch..i forget now...and replace one line at a time...don't pull em all off at once. It really doesn't take that long.

Make sure the 4" diameter gasket that connects the body of the spider to the intake manifold. Big source of vacuum leakage.

You will need to have the fuel distributor professionally rebuild, buy a reman one, or find an alluminium one off of an old v8 mercedez in the junk yard. (for some reason, they held up better than the cast iron Porsche"

The goal here is to eliminate problems and if you half ass these few things, you will be chasing ghosts.

The next thing is the WUR. I almost guarentee your's will need to be replaced. I'm a fairly good shade tree mechanic and I ruined mine trying to rebuild the internals working parts. I'm not saying you can't do it, I'm just saying to knock things off the list, you won't know if you did it right or not and the ghost will still be in the machine.

Lastly, hook up a fuel pressure guage to the system and read the pressures. You can find the range in the manuals. I think if i remember right "bar" should be about 1.5 at start and then rise to around 3.5 at temp. I'm sure I'm a little off, but you get the picture.

You willl spend most of your time learning fuel pressures. Fuel is the reason your car is not running...almost rock solid positive. clean the gunk and get the pressure system working...done. There is "system pressure" and "control pressure" They both need to be spot on.

Check timing. Good luck. I'll help if I can and even have new WUR for a standard...i can't remember if yours is standard or automatic. Yours was in about the same shape as mine when I started the project and I bet I spend roughly $700 dollars and four months of "i'll be in in a minute honey" work. I could have done it for less money if I had just stuck to the above steps and done it right the first time. I'll stop rambling.

[jackforey]

Awsome, I did actualltake the wur home and looked it over, and fulley checked all of it over. Sadly I made the mistake of pulling them all of the vacuum and basically all the rubber line in the engine bay (but I took massive amount of pictures and have super diagrams). Now I'm waiting on all the gaskets for the intake and a couple connectors and yes I agree I will not paint it or anything until the cars is idleing (hopefulley I get registration) and can test drive it the stick (5speed manual,) is extremely loose and I can't tell if its going into gear or not. Other then that I wish I cohld open the trunk to put parts in and battery and all. After all the gaskets, oil, coolant, battery and rubber hoses(in engine bay) I'm looking at 300 ish. And sadly reg is 600, so until I save up that (I wanna finish under the hood first) I will be taking a short brake to save.

[jackforey]

So i was taking off the caps on the fuel distributor and there are little plastic things in them...? why?

[jackforey]

Yep Im happy with her. So straight and wonderful and dirty llol.

[AirtekHVAC]

The little plastic things are fuel filters....they were plugged up on mine...most people remove them....

[AirtekHVAC]

Loose shifter is usually front shift ball cup, or rear shift coupling...I just replaced my ball cup today, and although it is better, the shifter is still sloppy...looks like I will have to do the rear coupling as well.

[jackforey]

Yep you can play catch with it ha, how much are they, and the fuel filters I cleaned them and put them back