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Jowniofownio212

911 sc rarely starts first time. Always second try

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Hello

i have a problem with my 1983 911sc. 

When I turn the key to start, the starter motor spins and spins but doesn’t start. 9 times out of 10 I can continue to do this and it still doesn’t start. But if I turn the ignition of then try again, 9 times out of 10 it always starts second time. 

My way to get it started is try first time for a second or 2 and then stop and start again and it usually does. 

Any ideas what this could be? Or what to check?

 

thanks

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Have you got an ancient immobiliser in the mix?

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2 hours ago, mean in green said:

Have you got an ancient immobiliser in the mix?

Not that I know of

1 hour ago, proporsche said:

how about cold start valve -the 7th injector..

Ivan

Any way to test this. Looking at symptoms of the cold start valve, I would have a rough idle at start up cold. I get a reasonably smooth idle after second attempt to start. 

It also doesn’t start as easy as I would expect. Maybe 4 cranks of the engine or so

 

thanks

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no ,you would not have a rough idle after start..you will have a hard starting procedure.To test the injector you have to check the power to it while you crank ,cold.It also comes from your left chain housing cover switch -the wiring.

Here is an index of tests...

CIStroubleshooting.jpg

 

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Ok, looking at that index, it could be:

Auxiliary air valve does not open (although idle seems reasonable)

cold start system defective

Thermo-time switch defective

cold control pressure outside torerance 

And possibly engine fuel pump not operating

 

 

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1 minute ago, Leicestershire said:

Worth checking the fuel pump fuse.

The modern plastic fuses can get hot and deform. This gives a poor contact in the holder. 

If you still have the bullet fuses, I’d second that. On my sc, before I installed one of Jonny’s boards, my fuel pump fuse used to get hot and had an intermittent fault where it would just lose contact and cut out. Wasn’t restricted to starting though in my case. Check the fuse for signs of heat. New board with blade fuses and no problem since. 

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i don`t think is the fuse if the car runs after the 2nd restart.Check your fuel pump relay and yes inspect the fuse too....the rest is going with the trouble shooting index...if looks like fuel delivery for sure..

 

Ivan

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