hot engine pinging

[Dan Bubb" <jdbubb@ix.netcom.com (Dan Bubb)]

Well, the engine won't ping when it's cold because the combustion chamber is
cold plus the mixture is probably richer.
Sounds like you ignition is too advanced.
If it's the stock mechanical/vacuum advance then there isn't much point
advancing it beyond the factory 6 deg BTDC.
Check that first.
Dan

----- Original Message -----
From: <Wolfsbrg8v@aol.com>
To: <scirocco-l@scirocco.org>
Sent: Wednesday, April 30, 2003 7:06 PM
Subject: hot engine pinging


>
> While my 84 8v is warming up from a cold start, there is
> good power and no pinging.
>
> But as it approaches/reaches fully hot, power drops off
> and moderate pinging can be heard when accelerating
> in the higher gears.
>
> I was at first thinking this would be a spark advance problem,
> but if so, why does it run ok when cold ?  Is there another
> regulator of ignition advance relating to temperature, or am I
> looking in the wrong place?
>
> Leo
>
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