porsche 911 sc 3.0 1983 cis Vacuum leak problem

[tom1975]

Hello friends,
I have a problem with a vacuum leak and I need to replace the seals in the connection of the Fuel manifolds ,
Is it possible to dismantle the cis system without removing the engine from the car?
Thank you
Tom

[javadog]

Yes.

JR

[tom1975]

Thanks for the quick reply,
It is easy to disassemble or story?
Do you have experience and can you give me some tips?
Where to start, What parts you may want to first?
There is really a serious problem of access And space to work with my hands
Thank you

[javadog]

It's not impossible but it is a lot of work. It's been discussed here a number of times. It might be easier for you to do a search of the forum.

JR

[T77911S]

you will want to replace injector sleeves and Orings too.

me, i would pull the motor do a good valve adjustment and maybe check the clutch.

[tom1975]

Originally Posted by T77911S

you will want to replace injector sleeves and Orings too.

me, i would pull the motor do a good valve adjustment and maybe check the clutch.

valve adjustment and clutch is good,
I want to avoid the pull of the engine,
That's why I asked.
Anyone know a good thread deals dismantling the system without pulling the engine?
thanks

[tom1975]

The problem I have at the moment in the car is the engine does not work well and round, he stumbles at the start of driving, as well as the chalk in second gear.
when I accelerate the engine feel better.
I checked the ignition, ignition wires, new spark plugs, new cd, new coil.
New fuel filter.
Usually I fix my own car, I have a technical background but not quite this vehicle.
My vehicle is 1983, and under the passenger seat I have dme unit and relay .
Relay was replaced a few months ago but maybe he screwed up again?
By the way is it can be the dme unit ? How do I check it.
My oxygen sensor disconnected by the previous owner
so I went to the garage yesterday and the mechanic told me I needed to replace fuel manifolds gaskets, rubber tubing .
He says there is a vacuum leak and that is what is causing the problem.
He says ן need to remove the engine to fix it and he asked a lot of money alotttttt .
I'm not sure that's the problem, I want to test myself a few directions, in any case I want to do the repair myself

[tirwin]

What year is the car? I recently dropped the engine in my 83. I know it is technically possible to remove the CIS in the car but holy moly I can't imagine trying to do it.

If you're trying to decide which is the bigger pain in the rear, I'd drop the engine every day of the week and twice on Sunday.

[javadog]

First, the unit under your seat isn't a DME unit.
Second, the O2 sensor needs to be working.

You can test the engine for vacuum leaks. It's been discussed here a number of times. Try doing a search.

Before you start chasing your tail, take some time to learn how the CIS system works on your 1983 SC. Then, you might want to check yourself for air leaks, for the correct fuel pressure, etc.

JR

[tom1975]

My car is 1983 sc.
Under the seat its lambda ?

[tom1975]

I saw a thread use a vacuum cleaner, vacuum test but did not understand how to add of the vacuum cleaner, where I plug it in? Exit of the exhaust?

[tirwin]

You must've posted while I was typing. I see now it's an '83. I know engine drop sounds bad but it is not bad at all. I had a fellow Pelican come over and help me through the first time. If I can you can.

Fuel manifold doesn't sound quite right. I guess he's talking about the air box gasket.

There is a TON of wisdom on this board. You can get your car running great again. There is so much you can address (triangle of death, etc.) with the engine out and your back will thank you.

[tirwin]

Search for "CIS for Dummies". You'll find a thread I started.

[tom1975]

I'm sorry for my English, I use a bit with a translator.
Thanks

[tom1975]

Originally Posted by tirwin

You must've posted while I was typing. I see now it's an '83. I know engine drop sounds bad but it is not bad at all. I had a fellow Pelican come over and help me through the first time. If I can you can.

Fuel manifold doesn't sound quite right. I guess he's talking about the air box gasket.

There is a TON of wisdom on this board. You can get your car running great again. There is so much you can address (triangle of death, etc.) with the engine out and your back will thank you.

I am located in Israel,
the mechanic said it's rubber from manifold to the box and the manifol gasket with the head

[tirwin]

My car is 1983 sc.

Under the seat its lambda ?

Yes. Aka Bosch K-Jetronic.

[tirwin]

Quote de tirwin

You must've posted while I was typing. I see now it's an '83. I know engine drop sounds bad but it is not bad at all. I had a fellow Pelican come over and help me through the first time. If I can you can.



Fuel manifold doesn't sound quite right. I guess he's talking about the air box gasket.



There is a TON of wisdom on this board. You can get your car running great again. There is so much you can address (triangle of death, etc.) with the engine out and your back will thank you.

I am located in israel

The michanic told me its the fuel maniful gasket and the rubber from the maniful to the box

You have a beautiful country! I was in Tel Aviv last year on business and I stayed in Herzliya. Really enjoyed my trip.

I will post some pictures when I get home later so you can see.

[tom1975]

Originally Posted by tirwin

Yes. Aka Bosch K-Jetronic.

Thanks ��
How can I Check this unit (lambda)?

[tom1975]

Originally Posted by tirwin

You have a beautiful country! I was in Tel Aviv last year on business and I stayed in Herzliya. Really enjoyed my trip.

I will post some pictures when I get home later so you can see.

Nice 👍

[javadog]

There is no point in checking the lambda control unit if the oxygen sensor is not connected and working.

JR