Engine quits

[Ron Clark]

78 GMC 403 engine dies on the highway. Sometimes restarts by itself,
sometimes restarts after coasting to the shoulder, sometimes requires a
short wait before it restarts. The last time, it didn't restart after
half an hour, so I had it towed 30 miles to a shop that is familiar with
GMCs, but is closed for the weekend. Left them the key and a note. Only
about 50 miles after a fill-up so not out of gas. I didn't check spark or
anything.
Any suggestions?

Ron & Linda Clark
North Plains, ORYGUN
1978 Eleganza II

 

[Jim Hupy]

Ron, if the outside temperature was over 85° or so, I would suspect vapor
lock. If cooler, then I would suspect ignition module or ignition coil.
Either way, check for fuel and check for spark. Then call me. I will guide
you through corrective measures.
Jim Hupy

>
> 78 GMC 403 engine dies on the highway. Sometimes restarts by itself,
> sometimes restarts after coasting to the shoulder, sometimes requires a
> short wait before it restarts. The last time, it didn't restart after
> half an hour, so I had it towed 30 miles to a shop that is familiar with
> GMCs, but is closed for the weekend. Left them the key and a note. Only
> about 50 miles after a fill-up so not out of gas. I didn't check spark or
> anything.
> Any suggestions?
>
>
> Ron & Linda Clark
> North Plains, ORYGUN
> 1978 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[b52rule]

Vapor lock, fuel pump come to mind.

Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375

www.bdub.net/novak/

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of
rallymaster
Sent: Saturday, July 08, 2017 4:25 PM
To: gmclist
Subject: [GMCnet] Engine quits

78 GMC 403 engine dies on the highway. Sometimes restarts by itself,
sometimes restarts after coasting to the shoulder, sometimes requires a
short wait before it restarts. The last time, it didn't restart after half
an hour, so I had it towed 30 miles to a shop that is familiar with GMCs,
but is closed for the weekend. Left them the key and a note. Only about 50
miles after a fill-up so not out of gas. I didn't check spark or anything.
Any suggestions?

Ron & Linda Clark
North Plains, ORYGUN
1978 Eleganza II

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[jim kanomata1]

Ron,
Fill the tank ALL the way past full and fill up every 70 miles till Monday
when a shop is open.
Have the shop call me and I will instruct them.

> Vapor lock, fuel pump come to mind.
>
> Len and Pat Novak
> 1978 GMC Kingsley
> The Beast II with dash lights that work and labels you can see!
> Fallbrook, CA new email: B52Rule
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
>
> www.bdub.net/novak/
>
>
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces] On Behalf Of
> rallymaster
> Sent: Saturday, July 08, 2017 4:25 PM
> To: gmclist
> Subject: [GMCnet] Engine quits
>
>
> 78 GMC 403 engine dies on the highway. Sometimes restarts by itself,
> sometimes restarts after coasting to the shoulder, sometimes requires a
> short wait before it restarts. The last time, it didn't restart after half
> an hour, so I had it towed 30 miles to a shop that is familiar with GMCs,
> but is closed for the weekend. Left them the key and a note. Only about 50
> miles after a fill-up so not out of gas. I didn't check spark or anything.
> Any suggestions?
>
>
> Ron & Linda Clark
> North Plains, ORYGUN
> 1978 Eleganza II
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> ---
> This email has been checked for viruses by AVG.
> http://www.avg.com
>
>
> _______________________________________________
> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502