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Engine run on
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Greaser2
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PostPosted: Thu Jan 06, 2022 1:06 pm    Post subject: Engine run on Reply with quote

1967 Squareback. My Square has lots of nice upgrades like internally regulated alternator, external oil cooler, and MSD ignition. I do have engine run on for about 1 second when key is switched off and I'm too anal to just live with it. The fix is to install a diode on the blue wire from the alternator to the ignition dummy light. I'm in the process of testing the diode to see if it fixes the problem and I completely disconnected the blue wire from the alternator. No dummy light of-course but still have run-on?? Maybe its not the dummy light? I also have a positive feed wire connected to the alternator feeding the external oil cooler but when I disconnect it no oil cooler fan but still have engine run-on. So with no positive feed from the alternator I have engine run on. Where can the extra voltage be coming from?
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KTPhil Premium Member
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PostPosted: Thu Jan 06, 2022 1:37 pm    Post subject: Re: Engine run on Reply with quote

Is it running indefinitely, or is it just "dieseling" as it ingests fuel and the hot engine can still ignite it?
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Greaser2
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PostPosted: Thu Jan 06, 2022 1:47 pm    Post subject: Re: Engine run on Reply with quote

Runs perfectly for that one second and shuts right off. I've had dieseling on other vehicles on occasion and its completely different. I did alot of idol and timing adjustments tuning the dual carbs but the engine run on was unimpacted and consistant.
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Greaser2
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PostPosted: Fri Jan 07, 2022 8:00 am    Post subject: Re: Engine run on Reply with quote

The diode in-line with the blue wire from alternator to ignition light did not solve the problem. Next will add a ballast resistor on the MSD small red wire.
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Erik G
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PostPosted: Fri Jan 07, 2022 4:37 pm    Post subject: Re: Engine run on Reply with quote

what carbs are you running?
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Greaser2
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PostPosted: Mon Jan 10, 2022 9:31 am    Post subject: Re: Engine run on Reply with quote

Weber 40
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Multi69s
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Joined: January 24, 2006
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PostPosted: Mon Jan 10, 2022 2:50 pm    Post subject: Re: Engine run on Reply with quote

Does it run on when the engine is cold, or only when its hot?
_________________
69 road Bug 2110
73 Squareback - 2L, T4, Automatic W/ AC
Gone, but many fond memories 69 Baja Bug 2010 - 5 Rib Bus Transaxle
Gone but not forgotten 72 Baja Bug 2010
My builds
T4 into Squareback http://www.thesamba.com/vw/forum/viewtopic.php?t=458944&highlight=
Auto Trans Rebuild http://www.thesamba.com/vw/forum/viewtopic.php?t=516066&highlight=
AC in Squareback https://www.thesamba.com/vw/forum/viewtopic.php?t=...highlight=
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Greaser2
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PostPosted: Tue Jan 11, 2022 11:21 am    Post subject: Re: Engine run on Reply with quote

Multi69s wrote:
Does it run on when the engine is cold, or only when its hot?

Both
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Multi69s
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PostPosted: Tue Jan 11, 2022 12:53 pm    Post subject: Re: Engine run on Reply with quote

If you have the MSD distributer with separate controller, I would contact MSD and talk to them.
_________________
69 road Bug 2110
73 Squareback - 2L, T4, Automatic W/ AC
Gone, but many fond memories 69 Baja Bug 2010 - 5 Rib Bus Transaxle
Gone but not forgotten 72 Baja Bug 2010
My builds
T4 into Squareback http://www.thesamba.com/vw/forum/viewtopic.php?t=458944&highlight=
Auto Trans Rebuild http://www.thesamba.com/vw/forum/viewtopic.php?t=516066&highlight=
AC in Squareback https://www.thesamba.com/vw/forum/viewtopic.php?t=...highlight=
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Greaser2
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PostPosted: Fri Jan 14, 2022 8:06 am    Post subject: Re: Engine run on Reply with quote

Added a ballast resistor on the ignition feed to the MSD box. Problem fixed.
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