[DML] Re: pinging and ignition advance
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[DML] Re: pinging and ignition advance

The vacuum to the vacuum advance is manifold vacuum if connected 
properly. That means it falls off under load. So, vacuum leaks, even 
small, can cause problems. Also check to see if the hot/cold air 
valve on the air intake duct is working properly. If there is no 
cold air after warm up that can cause problems. I noticed your plugs 
are copper - S/B silver (HR6DS), but that is probably not your 
problem. I would suspect a vacuum leak or the hot/cold air valve. 
Premium gas will probably stop the pings until you locate the 
problem - pinging is not good. 

Harold McElraft - 3354


-- In dmcnews@xxxxxxxxxxxxxxx, Jason Ferrara <jason@...> wrote:
> Well, I got myself a vacuum pump and gauge. The vacuum advance 
> to be working correctly. If I apply vacuum to the distributor 
> running the engine at idle the timing follows the table in the  
> workshop manual. If I hook all the vacuum hoses up correctly and 
> at the timing at 4000+ RPM, I see 53 degrees (13 base + 20 
> + 20 vacuum).
> One thing I did notice is that if I hook the vacuum gauge to the 
> that goes to the distributor, I see 0 HG at idle, and it jumps to 
> 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 
> full vacuum advance, except at idle. Is this normal?
> Spark plugs are Bosch HR6DC. I pulled the no. 6 plug, and it 
> normal. 
> >
> >

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