| Backfire City [message #171300] |
Tue, 29 May 2012 22:47  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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OK, is the firing order in the 1976 Service manual correct? I have checked the firing order 3 times and it is correct. I did not remove my distributor during the manifold swap, and I'm pretty sure it is not loose. All plug wires are tight.
Engine idles fine, a bit rough, but normal, but under any sort of accel or load or even revving in Park, I get constant backfire. WTF???
All I did was R&R the manifold. Is it possible I have a leak between the ports and the crossover ports? I wouldn't think so. Nothing else has been changed...
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: Backfire City [message #171302 is a reply to message #171300] |
Tue, 29 May 2012 22:53  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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GM basic 18436572 as far as I know. Retrace those wires again. Between Rick and Matt there is an "I know better than to do that" Olympics competiton on.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Backfire City [message #171303 is a reply to message #171302] |
Tue, 29 May 2012 22:55 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Yeah, I noticed that. I don't plan on participating in that compettition. At least the manifold is not leaking... on the outside... This is driving me nuts.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: Backfire City [message #171304 is a reply to message #171300] |
Tue, 29 May 2012 22:56 |
homer
Messages: 73
Registered: April 2011
Location: arizona/ BC canada
Karma: 0
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Pull your plugs one is not firing could be the plug or a crossed lead. good luck. homer
homer
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| Re: Backfire City [message #171307 is a reply to message #171300] |
Tue, 29 May 2012 23:07 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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Nope, 3 an 6 were swapped. Stupid manual has the little picture of the distributor wrong. but the 1-8-4-3-6-5-7-2 is correct RIGHT DAMN NEXT TO IT!!!
I wonder if THAT ever came up in this forum before. I never have this problem as I usually label them, but the sharpie was a bit worn off so I blew the dust off the manual and sure as shit it burned me.
So much for taking it out to the storage tonight. Time to open a beer.
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Backfire City [message #171309 is a reply to message #171307] |
Tue, 29 May 2012 23:22 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Chris,
Sorry 'bout that. The incorrect timing sequence in the manual is a long,
long known error. But there's always that 2%. :-)
Ken H.
On Wed, May 30, 2012 at 12:07 AM, Chris Choffat wrote:
>
>
> Nope, 3 an 6 were swapped. Stupid manual has the little picture of the
> distributor wrong. but the 1-8-4-3-6-5-7-2 is correct RIGHT DAMN NEXT TO
> IT!!!
>
> I wonder if THAT ever came up in this forum before...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Backfire City [message #171311 is a reply to message #171309] |
Tue, 29 May 2012 23:30 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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did y-all read here?
http://gmcmotorhome.info/engine.html
gene
On Tue, May 29, 2012 at 9:22 PM, Ken Henderson <hend4800@bellsouth.net>wrote:
> Chris,
>
> Sorry 'bout that. The incorrect timing sequence in the manual is a long,
> long known error. But there's always that 2%. :-)
>
> Ken H.
>
>
> On Wed, May 30, 2012 at 12:07 AM, Chris Choffat wrote:
>
> >
> >
> > Nope, 3 an 6 were swapped. Stupid manual has the little picture of the
> > distributor wrong. but the 1-8-4-3-6-5-7-2 is correct RIGHT DAMN NEXT TO
> > IT!!!
> >
> > I wonder if THAT ever came up in this forum before...
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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