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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:

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
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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[Message index]

		[GMCnet] back fire in 78 Birch with a 403. By: Steve Phillips on Thu, 11 August 2011 23:40
		Re: [GMCnet] back fire in 78 Birch with a 403. By: jimk on Thu, 11 August 2011 23:47
		Re: [GMCnet] back fire in 78 Birch with a 403. By: Steven Ferguson on Fri, 12 August 2011 06:55
		Re: [GMCnet] back fire in 78 Birch with a 403. By: Bob de Kruyff on Fri, 12 August 2011 23:22

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