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| Re: [GMCnet] Starting on our Adventure form Minneapolis to Colorado [message #150515 is a reply to message #150409] |
Wed, 23 November 2011 10:30   |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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Senior Member |
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Whew, we made it home, What was suppose to be a 14 hour trip turned into
46 houirs. detail after I get some sleep!!
On Tue, Nov 22, 2011 at 6:24 AM, Matt Colie <matt7323tze@gmail.com> wrote:
>
>
> Bruce Hart wrote on Tue, 22 November 2011 07:46
> > When I go to shut off the motor, the motor continues to run on. Is this
> a timing problem? Octane grade problem?
> > Any ideas?
> > 0
>
> Bruce,
>
> It is most often a carbon build up problem. Take her out on the road
> where she was meant to be. Run a couple of hours. If the problem
> continues, check the idle mixture.
>
> These are general answers, there are others here that know the 455 much
> better than I do, but this sure works on mine.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will
> find
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Bruce Hart
GMC Wannabe
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: [GMCnet] Starting on our Adventure form Minneapolis to Colorado [message #150518 is a reply to message #150515] |
Wed, 23 November 2011 11:10 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Bruce, the most common cause of run on after the ignition is turned off
(and the engine is not overheated) is that the idle speed is set too high.
If you don't want to reduce the idle speed, then leave the coach in gear
with your foot on the brake, and then turn off the engine. If it still runs
on, recheck your tune up specs, and verify that your engine is still
correct according to the specs. Pay particular attention to ignition
timing, and idle speed. Be sure to disconnect the vacuum line from the
distributor, and plug the part that goes back to the engine with a golf tee
or similar object. Also verify that you do not have any other vacuum hoses
that leak. Last, and certainly not least, verify that your carb base gasket
is not leaking. I spray a little WD--40 around the carb base with the
engine running. If idle speed increases, you have a leaking gasket or a
warped carb throttle body.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Wed, Nov 23, 2011 at 8:30 AM, Bruce Hart <hartsgmc@gmail.com> wrote:
> Whew, we made it home, What was suppose to be a 14 hour trip turned into
> 46 houirs. detail after I get some sleep!!
>
> On Tue, Nov 22, 2011 at 6:24 AM, Matt Colie <matt7323tze@gmail.com> wrote:
>
> >
> >
> > Bruce Hart wrote on Tue, 22 November 2011 07:46
> > > When I go to shut off the motor, the motor continues to run on. Is
> this
> > a timing problem? Octane grade problem?
> > > Any ideas?
> > > 0
> >
> > Bruce,
> >
> > It is most often a carbon build up problem. Take her out on the road
> > where she was meant to be. Run a couple of hours. If the problem
> > continues, check the idle mixture.
> >
> > These are general answers, there are others here that know the 455 much
> > better than I do, but this sure works on mine.
> >
> > Matt
> > --
> > Matt & Mary Colie
> > '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you
> will
> > find
> > SE Michigan - Twixt A2 and Detroit
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Bruce Hart
> GMC Wannabe
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
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Unsubscribe or Change List Options:
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| Re: [GMCnet] Starting on our Adventure form Minneapolis to Colorado [message #150536 is a reply to message #150518] |
Wed, 23 November 2011 14:29 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
|
Senior Member |
|
|
Thanks everyone for you post.
Yes the idle is set high, probably a lot of carbon build up as well with a
little bit of blow-by as well. Now that I am home I will give it a tune-up.
On Wed, Nov 23, 2011 at 10:10 AM, James Hupy <jamesh1296@gmail.com> wrote:
> Bruce, the most common cause of run on after the ignition is turned off
> (and the engine is not overheated) is that the idle speed is set too high.
> If you don't want to reduce the idle speed, then leave the coach in gear
> with your foot on the brake, and then turn off the engine. If it still runs
> on, recheck your tune up specs, and verify that your engine is still
> correct according to the specs. Pay particular attention to ignition
> timing, and idle speed. Be sure to disconnect the vacuum line from the
> distributor, and plug the part that goes back to the engine with a golf tee
> or similar object. Also verify that you do not have any other vacuum hoses
> that leak. Last, and certainly not least, verify that your carb base gasket
> is not leaking. I spray a little WD--40 around the carb base with the
> engine running. If idle speed increases, you have a leaking gasket or a
> warped carb throttle body.
> Jim Hupy
> Salem, OR
> 78 GMC Royale 403
>
> On Wed, Nov 23, 2011 at 8:30 AM, Bruce Hart <hartsgmc@gmail.com> wrote:
>
> > Whew, we made it home, What was suppose to be a 14 hour trip turned into
> > 46 houirs. detail after I get some sleep!!
> >
> > On Tue, Nov 22, 2011 at 6:24 AM, Matt Colie <matt7323tze@gmail.com>
> wrote:
> >
> > >
> > >
> > > Bruce Hart wrote on Tue, 22 November 2011 07:46
> > > > When I go to shut off the motor, the motor continues to run on. Is
> > this
> > > a timing problem? Octane grade problem?
> > > > Any ideas?
> > > > 0
> > >
> > > Bruce,
> > >
> > > It is most often a carbon build up problem. Take her out on the road
> > > where she was meant to be. Run a couple of hours. If the problem
> > > continues, check the idle mixture.
> > >
> > > These are general answers, there are others here that know the 455 much
> > > better than I do, but this sure works on mine.
> > >
> > > Matt
> > > --
> > > Matt & Mary Colie
> > > '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you
> > will
> > > find
> > > SE Michigan - Twixt A2 and Detroit
> > > _______________________________________________
> > > GMCnet mailing list
> > > Unsubscribe or Change List Options:
> > > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > >
> >
> >
> >
> > --
> > Bruce Hart
> > GMC Wannabe
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Bruce Hart
GMC Wannabe
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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