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-   -   Cuts out and doesn’t like idling (http://forums.pelicanparts.com/porsche-911-technical-forum/1059945-cuts-out-doesn-t-like-idling.html)

RossJT 05-03-2020 10:06 AM

Cuts out and doesn’t like idling
 
Hi guy,

First of all I have a 1975 911s 2.7L LHD from California and it’s not running right.
I have owned the car for 2 years as a side project and I have never driven it but I have videos of it driving from the guy I purchased it off.

Anyway to the problem....

When I turn the key it doesn’t want to start
But if I push the accelerator down just a little it starts,
and if I keep the accelerator in the same place its fine but as soon as I take my foot off the pedal the car dies straight away,

I have tried adjusting the idle screw both ways and it doesn’t seem to make a difference.

The car has a new fuel tank, fuel pump, fuel filter and the fuel distributor rebuilt as it was leaking.

Also a new CDI box, ignition leads, ignition coil, starter motor and battery.

So like I said your help is greatly needed so I can get it on the road for the first time!

Thanks


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Zaz 05-03-2020 01:59 PM

Are you pulling up the hand throttle (next to / left of the hand brake) to engage the cold start circuit? The engine needs more fuel on cold start so all those components need to be operable.

Locker537 05-03-2020 02:04 PM

What happens if you keep the accelerator pressed for 1-2 minutes and then let it idle?

What's been done to the engine? Is it the original CIS?

proporsche 05-03-2020 02:19 PM

Quote:

Originally Posted by Zaz (Post 10850335)
Are you pulling up the hand throttle (next to / left of the hand brake) to engage the cold start circuit? The engine needs more fuel on cold start so all those components need to be operable.


this

RossJT 05-04-2020 11:20 AM

Quote:

Originally Posted by proporsche (Post 10850361)
this


https://uploads.tapatalk-cdn.com/202...ef9ef859af.jpg
I had a look and there was no white plastic bit there to connect to the cable, so I have ordered one and should be here in a few days,
so that lever wasn’t doing anything!
I will keep you posted and how it goes.https://uploads.tapatalk-cdn.com/202...8c2a52a241.jpg


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E Sully 05-04-2020 11:40 AM

Here is the starting procedure, and links to adjusting the hand throttle if needed.

http://forums.pelicanparts.com/porsche-911-technical-forum/732035-adjusting-hand-throttle-74-a.html

http://forums.pelicanparts.com/porsche-911-technical-forum/639786-hand-throttle-lever.html

http://forums.pelicanparts.com/uploa...1588621169.gif

RossJT 05-08-2020 08:14 AM


Thank you... I’m still waiting on the part to arrive, will keep you posted.


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RossJT 05-27-2020 12:01 PM

Right guys it’s been some time!
I think I found my problem but I need your help,

So I got new fuel injectors and made sure the fuel distributor was spraying out equal on all 6 injectors.[emoji736]

This is what I found... car wasn’t idling because the plate wasn’t getting to the right height to release the fuel and air wasn’t passing the plate.

https://uploads.tapatalk-cdn.com/202...d767c633cd.jpg
Photo 1 Engine off- plate is at normal height.
(This is what height I would expect to see the plate ones the fuel pump is on... or am I wrong?)


https://uploads.tapatalk-cdn.com/202...6cc6b03ea3.jpg
Photo 2 Fuel pump running - the plate is to low so as I turn the key to start it and the plate raises up like it should do, it’s not enough to start the the injectors.



https://uploads.tapatalk-cdn.com/202...fb04b368fe.jpg
Photo 3 The height the fuel starts to spray from the injectors / this is the height it should be on idle, up enough so air can pass and start the injectors.

So really what I’m asking is how I adjust the plate hight up so when the fuel pump is on it’s sat at the right height?

Before you ask, this is how I think I found the problem...

https://uploads.tapatalk-cdn.com/202...3ecbd7f3e3.jpg
I wedged a block under the leaver so when the pump is on it doesn’t drop.. then when I start the engine the plate rises and the car idles at 1000/950 RPM like it should, this is why I think the hight is my problem.

Any help welcome please


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nomore 05-27-2020 12:51 PM

Search adjusting CIS air sensor plate for a 75. My 74 had this issue and the adjustment is made by bending the strange clip in your photo to change the stop height for the plate. A schematic makes it clear. Basically your improvised stop has to be duplicated with the clip. Good luck, John.

RossJT 05-28-2020 09:24 AM

Quote:

Originally Posted by nomore (Post 10881512)
Search adjusting CIS air sensor plate for a 75. My 74 had this issue and the adjustment is made by bending the strange clip in your photo to change the stop height for the plate. A schematic makes it clear. Basically your improvised stop has to be duplicated with the clip. Good luck, John.


Thank you John, Nothing seemed to come up when I searched.. you wouldn’t happen to have a link do you? Just had a look at it again...

where you referring to this clip to bend?
https://uploads.tapatalk-cdn.com/202...a2516f5a82.jpg
When I make it longer to push the plate up it dose that but when the pump is running it still pushes the plate down! https://uploads.tapatalk-cdn.com/202...3c9ed169f9.jpg

As the plate goes down that clip gets lose and affectively does nothing to prevent the plate from moving down to much.


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