| [GMCnet] back fire in 78 Birch with a 403. [message #138627] |
Thu, 11 August 2011 23:40  |
Steve Phillips
Messages: 63
Registered: February 2004
Karma: 0
|
Member |
|
|
Hi
Need help with a backfire problem. I was on a short trip with my coach
when it started to backfire threw the crab.It seemed to be worse when
under power like going up a hill. I replaced plugs and wires checked
timing and had to advance timing about 10 deg.and it would run a low
speed then die. Checked vac and it seemed to be normal.but it still dies
under a little power.
I am about to give up and and blame the timing chain. which i really
hope it is not the prob.
I hope someone on the net that has had this prob..and found a
CURE.:-( :-D
P.S., the engine just turned over 100K. Thank Steve Helena Mt
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] back fire in 78 Birch with a 403. [message #138628 is a reply to message #138627] |
Thu, 11 August 2011 23:47  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
Check your fuel filter and also spray carb cleaner around the base of carb .
Also torque the 4 carb bolts.
On Thu, Aug 11, 2011 at 9:40 PM, steve <mr34@pipeline.com> wrote:
> Hi
> Need help with a backfire problem. I was on a short trip with my coach
> when it started to backfire threw the crab.It seemed to be worse when
> under power like going up a hill. I replaced plugs and wires checked
> timing and had to advance timing about 10 deg.and it would run a low
> speed then die. Checked vac and it seemed to be normal.but it still dies
> under a little power.
>
> I am about to give up and and blame the timing chain. which i really
> hope it is not the prob.
>
>
> I hope someone on the net that has had this prob..and found a
> CURE.:-( :-D
>
> P.S., the engine just turned over 100K. Thank Steve Helena Mt
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
|
|
| Re: [GMCnet] back fire in 78 Birch with a 403. [message #138794 is a reply to message #138627] |
Fri, 12 August 2011 23:22 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
| Steve Phillips wrote on Thu, 11 August 2011 22:40 |
Hi
Need help with a backfire problem. I was on a short trip with my coach
when it started to backfire threw the crab.It seemed to be worse when
under power like going up a hill. I replaced plugs and wires checked
timing and had to advance timing about 10 deg.and it would run a low
speed then die. Checked vac and it seemed to be normal.but it still dies
under a little power.
I am about to give up and and blame the timing chain. which i really
hope it is not the prob.
I hope someone on the net that has had this prob..and found a
CURE. 
P.S., the engine just turned over 100K. Thank Steve Helena Mt
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
Don't discount the distributor module.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
