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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   '78 SC: cranking but not firing (http://forums.pelicanparts.com/porsche-911-technical-forum/1144724-78-sc-cranking-but-not-firing.html)

Procul 08-14-2023 03:36 PM
Quote:
Originally Posted by pmax (Post 12067802)
What's that ?
Air flow switch / air sensor control
I think they're two names for the same thing, green connector behind the airbox

Procul 08-14-2023 03:41 PM
I'm starting to suspect I have a disconnected wire somewhere, like maybe a mouse gave something a chew. But if I have spark, shouldn't it fire? Especially when I sprayed fluid in the box?

I know the PO liked to hook up lots of auxiliary electronic stuff, I'm even wondering if there's some anti-theft circuit he installed.

Of course electrical stuff is my weak suit.

Procul 08-14-2023 04:11 PM
Thomas,

The injector does NOT spray when ignition is switched on;
I tested it by lifting the plate in the airbox and activating the injector pump with ignition switch in the on position.

pmax 08-14-2023 04:33 PM
Quote:
Originally Posted by Procul (Post 12067818)
Air flow switch / air sensor control
I think they're two names for the same thing, green connector behind the airbox
Where else did you find the latter name used ?

Procul 08-14-2023 04:53 PM
Quote:
Originally Posted by pmax (Post 12067892)
Where else did you find the latter name used ?
https://forums.pelicanparts.com/porsche-911-technical-forum/404255-colors-cis-connectors-wur-aar-csv-etc.html#post3889869

Here's one example. I think I've seen it a number of times in this forum.

pmax 08-14-2023 05:17 PM
Quote:
Originally Posted by Procul (Post 12067921)
That's the same guy who posted this, referring to what's marked as the AFS in the picture as the ASC, very odd.

Quote:
Originally Posted by Gunter (Post 5290913)
They look the same when they're dirty but on closer inspection the difference shows up. :)

http://forums.pelicanparts.com/uploa...1271090200.jpg

You could try to mimmick the function of the ASC by taking the plug off and wire a ground from plug to case. Ignition ON, pump shouldn't run, ground from ASC plug to case should prevent the pump from running? If it does, it means the ASC is not adjusted right to provide ground.
Good thing there's no confusion as to what's called the CSV !

Procul 08-15-2023 06:20 AM
Quote:
Originally Posted by pmax (Post 12067952)
That's the same guy who posted this, referring to what's marked as the AFS in the picture as the ASC, very odd.
Right? It took me a week to figure out what those two connectors do. As if these engines weren't complicated enough, all we need is two names for everything!


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