[DML] Re: pinging and ignition advance

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

Your mixture may be too lean. That can happen from vacuum leaks or
just a wrong adjustment. If the motor is running too hot that can
cause pinging. Check it's temp with a thermometer or an IR meter. Try
another tank of fuel from another vendor. Maybe there is water in it.
Inspect the tank. You would see a bubble of water floating around on
the bottom if there is any in there. Maybe the noise you hesr isn't
pinging but cross-fire. Recheck the firing order, routing of the
wires, gap of the plugs, and the condition of the ignition wires,
distributer cap and rotor.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, Jason Ferrara <jason@...> wrote:
>
> Well, I got myself a vacuum pump and gauge. The vacuum advance seems  
> to be working correctly. If I apply vacuum to the distributor while  
> running the engine at idle the timing follows the table in the  
> workshop manual. If I hook all the vacuum hoses up correctly and look  
> at the timing at 4000+ RPM, I see 53 degrees (13 base + 20 mechanical  
> + 20 vacuum).
> 
> One thing I did notice is that if I hook the vacuum gauge to the line  
> that goes to the distributor, I see 0 HG at idle, and it jumps to 20  
> HG as soon as the engine comes off idle, and stays around that as  
> RPMs increase. This would seem to imply that I'm always running with  
> full vacuum advance, except at idle. Is this normal?
> 
> Spark plugs are Bosch HR6DC. I pulled the no. 6 plug, and it looks  
> normal. I'll check the others tomorrow after the engine cools.  
> Reaching down past the intake manifold when its hot is a pain.
> 
> I also ran SeaFoam through the engine. Made lots of white smoke and  
> probably scared the neighbors, but the engine still makes the pinging  
> 








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