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VVWC :: View topic - 1979 bus off highway idle issues and more
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1979 bus off highway idle issues and more

 
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Mike20
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Joined: Jul 15, 2008
Posts: 85
Location: Victoria

PostPosted: Sun Sep 03, 2017 11:26 am    Post subject: 1979 bus off highway idle issues and more Reply with quote

Alright! I have been working on this problem for awhile and I am out of ideas here.

If I am driving off the highway at high RPMs and slow down to stop my idle remains high. I have petronix electric ignition because who wants to deal with points? Last weekend I ripped my vacuum system completely apart looking for leaks and tightened everything back down with clamps. My EGR valve hole is nicely plugged up and I have ruled that out too. So what is going on here? I am going to check if my distributor is sticky today but I am out of ideas.

Another problem that I haven't found anyone else having online is that my engine timing likes to "travel" from -7.5 BTDC towards -12 over the course of two weeks before I have to adjust it again. Has anyone else suffered from this problem?

Lastly, has anyone dealt with an oil breather box spewing oil? It is making my engine bay a mess. What might cause this to happen?

Any help or ideas would be much appreciated!

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donandrobin
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Joined: Jul 22, 2005
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PostPosted: Sun Jan 20, 2019 2:12 pm    Post subject: Reply with quote

We have a 78 bus and would love to hear any suggestions that come up...
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brenticon
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Joined: Jul 06, 2012
Posts: 216

PostPosted: Sun Jan 20, 2019 10:22 pm    Post subject: Reply with quote

Old post but ...
... revs stay high, sounds like distributor issue. Vacuum or bearings?
... Oil breather spewing, crank case pressure relief? Rings?
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donandrobin
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PostPosted: Mon Jan 28, 2019 6:41 pm    Post subject: Reply with quote

I spent a bit of the day today "playing" with our 78 Bus and it turns out the seals for the fuel injector on the second piston were all but crumbled. The slightest spray of injector cleaner in the area revved the engine right up! I used injector cleaner and checked every connection, hose, etc... also found the check valve for the master cylinder was leaking. So happy to finally figure it out!

Always nice to fix two things at once. Never happens!
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donandrobin
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PostPosted: Wed Feb 06, 2019 6:21 pm    Post subject: Reply with quote

I replaced the o-rings for the 1st and 2nd fuel injector today, and put everything back together. Double checked everything... however I can still hear air being sucked in past the injectors.

The old o-rings weren't terrible, however they were soft and squishy. The new ones are definitely noticeably firmer.

Did I miss something? Is there something else I should check? What could it be besides the o-rings? The injectors for piston 3 and 4 are perfect, if I spray injector cleaner on them there is no difference in idle, but there certainly is when I do the same thing on the 1 and 2 piston side.

The only thing I can think is the little metal brackets (with the hole in the middle for the injector) that hold the injectors in are slightly bent from years of use?

Appreciate some advice.
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brenticon
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PostPosted: Wed Feb 06, 2019 6:42 pm    Post subject: Reply with quote

Maybe swap sides with them
If they work on one side, you'd think they'd work on try other.
Quick and easy check for sure
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donandrobin
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PostPosted: Wed Feb 06, 2019 6:47 pm    Post subject: Reply with quote

I also read on the samba it could be the intake manifold gaskets... it would be difficult to tell if the injector cleaner is being sucked in past the injectors or the gasket since they are so close. I'll try to narrow it down tomorrow to see exactly what's going on.
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