Engine dying once warm

ldsvwguy · Posted: Mon Jul 27, 2009 8:47 pm Post subject: Engine dying once warm

I have been having a new issue as of late. Once my engine has warmed up, it dies when it tries to idle. For example, I drove about 15-20 minutes on back roads cruising about 40. I hit a stop sign and the oil light flickered then the bus stalled out. It took about 20-30 seconds to start it up again and it did the same thing at the next stop sign. I have to keep my foot on the gas to keep it alive when stopped after it warms up. It cold starts fine and idles fine when cold. After driving, if I hit up a store and the bus has a chance to sit for 1/2 hour or so it runs fine again until it warms up. I have looked up threads about vapor lock but am not sure if that is what it is. I also am not exactly sure how to fix it if it is.

I am running a 1776 with dual 40 kads.

Campy · Posted: Mon Jul 27, 2009 11:57 pm Post subject:

The carburetors could need rebuilding. Remove the spark plugs to see if there is a buildup of carbon on them. If you had a stock carburetor I would have thought that the choke valve was not opening all of the way.
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sconord · Posted: Tue Jul 28, 2009 3:02 am Post subject:

I had the same thing and could not figure it out- I had a bad condenser on my distributor. The ceramic in the condenser cracks and when hot expands changing the way it handles the voltage\impedence/whatever.

I replaced the distributor (petronixs)and problem was gone.

IMO- From my experience. May not fix yours, but did for me.
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ldsvwguy · Posted: Tue Jul 28, 2009 10:06 am Post subject:

I have a petronix in it and the carbs were rebuilt about 3 months ago. Any other ideas?

Nor_AL_67 · Posted: Tue Jul 28, 2009 10:10 am Post subject:

Have you checked for vacuum leaks around anything that connects to the intake manifold(s)? Spray starter fluid (or wd40) to see if the idle changes.
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63 Sedan
61 Rag
67 Type 1 Sedan
63 Type 2 Standard Walk-thru
69 Ghia
68 912

Amateur Versus Rusty Bus!

BulletBus · Posted: Tue Jul 28, 2009 12:24 pm Post subject:

Pertronix could be bad also. That happens more than you would expect.
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arthurnugen · Posted: Tue Jul 28, 2009 12:51 pm Post subject:

67slownlowBus · Samba Member Joined: July 19, 2010 Posts: 13

I am having the same problem. What did you figure out it was? I am in a 67 bus. Drives great for about 20 minutes after that as soon as i hit a stop light it dies. What did you find out????

Culito · Posted: Fri Aug 06, 2010 3:59 pm Post subject:

Keysar · Posted: Fri Aug 06, 2010 4:38 pm Post subject:

Hmmm The only thing I can think of is the idle adjustment?
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sconord · Posted: Sat Aug 07, 2010 2:08 pm Post subject:

Vacuum leak when warm- something loose.

Missing engine tin could cause block or heads to overheat- loss of compression. Check your engine temp when it dies.

Ideas only.

I am trying to diagnose it with my new 1600 dual port, but mine idles don till it stalls. But , mine starts up easily.
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Cptn. Calzone · Posted: Sat Aug 07, 2010 2:56 pm Post subject: bus dies

Check all of the fuel lines are clear and the sock in the tank, when the motor draws fuel as it runs the crud could block the flow.Stop and the crud falls away.Also Ck the coil, a bad coil will die when hot, and finally put you to walking. my .02
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67 912 Porsche Quintilla
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Culito · Posted: Sat Aug 07, 2010 4:00 pm Post subject:

Matt Miller · Posted: Sat Aug 07, 2010 7:35 pm Post subject:

Sounds like you're overheating.


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