Re: [T3] Backfiring...

[William Kunz <satchel18@yahoo.com>]

Will do. Thanks Jim. 
--- Jim Adney <jadney@vwtype3.org> wrote:
> On 21 Oct 2003 at 13:28, William Kunz wrote:
> 
> > Sorry to bring this up again, but it looks like
> I'm
> > getting a backfire thru the carb. When I go to
> start
> > the car, the engine will kick over with a couple
> of
> > pumps to the accelerator. While the engine is
> trying
> > to maintain an idle there is "popping" from the
> > engine, not thru the exhaust. My friend confirmed
> this
> > as he saw a flash come out of the right hand carb
> when
> > we took the air cooler off and restarted. I have
> dual
> > 32 PDSIT carbs. After the car is idling, the
> popping
> > stops and the car runs normally. Any suggestions?
> 
> Is there any chance that you have the idle ignition
> timing set extremely 
> advanced? It makes me wonder if the mechanical
> advance on your distributor 
> might be frozen and someone has dialed in a lot of
> static advance to make it 
> seem to work better at speed. I really don't know if
> this would cause your 
> problem, but I can't think of any other reason other
> than an intake valve that 
> is not sealing, but that's pretty unusual.  
> 
> I suppose it's possible that you have an intake
> valve stem which is varnished  
> up and is sticking until it gets warm. This might
> explain why ignition within 
> the chamber is able to flash back to the carbs. You
> might find the culprit by 
> doing a compression test with the engine cold.  
> 
> -- 
> *******************************
> Jim Adney, jadney@vwtype3.org
> Madison, Wisconsin, USA
> *******************************
> 
>
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