Pontiac: Getting some pinging underload

In article <supernews.com>, org says... 

Well you got colder denser air going into there. Something is still
causing a problem though. Those 3.1's are not a high compression engine.

On Fri, 23 Jan 2004 16:10:05 GMT, Bon·ne·ville <sp@m.b.gone> wrote:
 
Check the EGR. No EGR will give you a ping at part throttle.

How do you check egr valve?

<clare @ snyder.on .ca> wrote in message
news:com... 
gas 
I 
caused the 
weather 

Isn't the formulation of winter gas different than during other times
of the year? Have you tried a different brand? I have a tendency to
be suspect of some gas, I mean how can we tell if their octane is
really what they say it is? Isn't it possible someone made a mistake
and mixed up some low octane with what was supposed to be high? Also,
carbon buildup can cause preignition, there are various
products/methods to help clean the engines's top end but while many
have reported success with same some have also said the pinging came
right back. Some GM mechanic posted on one of the ng's about torn
down engines in the northern US during winter exhibit a lot more
carbon buildup.

"Popeye Sailor..US Navy" <org> wrote in message
news:supernews.com 
because 

On Fri, 23 Jan 2004 22:32:08 -0500, "Jebadiah Springfield"
<com> wrote:
 
A 97 is OBD2 so a scanner will tell you. It has an electric feedback
EGR.