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Registered
Join Date: Sep 2020
Posts: 409
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Intermittent shut off problem
Hi all.
I have an intermittent shut off problem with my 911SC. The engine does not stop immediately when turning off the ignition switch. Any ideas ? Car is fitted with ITB’s and modern ECU. It does not happen often and it does not bother me very much, but still want to find out why. Cheers Sent from my iPhone using Tapatalk |
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11-10-2021, 12:43 AM
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Get off my lawn!
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Look at all the grounds as the likely issue. Clean every ground, even if they look fine. Replace any ground strap that does not look pristine.
Most electrical issues are bad grounds.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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11-12-2021, 01:54 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,449
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Who knows how the new system is wired, but you might need a diode on the fuel pump or alternator circuit. That's my main beef with EFI conversions, they work fine when they finally get set up properly, but troubleshooting is a bittch. Most shops don't have a clue.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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11-12-2021, 03:29 PM
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Registered
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Try running the engine at a fast idle, say1500rpm.
Shut the key off. If the engine keeps running then the charging system is back feeding, you have a really bad ground situation at stated above, or wonky wiring. |
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11-12-2021, 05:09 PM
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ROW '78 911 Targa
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Describe how you wired up your fuel pump relay.
And if you are using the factory style red relay.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. Last edited by timmy2; 11-14-2021 at 03:08 PM.. |
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11-12-2021, 08:37 PM
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Registered
Join Date: Jan 2007
Location: SC
Posts: 1,640
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Subed.
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11-14-2021, 11:33 PM
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Carrera
1987 Carrera
Heinz
