Thanks everyone for your suggestions. I think it might just be the
re-formulated winter gas. On some tanks it pings, on others it doesn't.

Thanks,

Tom

"Jerry Bransford" <jerrypb@mecox.net> wrote in message
news:YEQBb.28$kB6.25@fed1read05...
> Ok, I was going to suggest that it might have a bit of a carbon build-up
in
> the combustion chambers if you drive ultra-conservatively. Carbon can
cause
> pinging by it continuing to glow after the combustion stroke, prematurely
> igniting the next cycle's air-fuel mixture. The cure is to either blow
the
> carbon out by driving ultra-aggressively or cleaning it out with either a
> chemical cleaner or carefully and slowly dribbling 12 to 16 ounces of
water
> into the combustion chamber through the air intake while the engine runs.
>
> Jerry
> --
> Jerry Bransford
> To email, remove 'me' from my email address
> KC6TAY, PP-ASEL
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
>
> "mabar" <mabar@NOSPAMgbronline.com> wrote in message
> news:kfOdneXhsPniI0qiRVn-tw@gbronline.com...
> > I guess moderate. 1/2 city, 1/2 freeway. Some fast starts. Freeway speed
> is
> > usually around 70 mph. Definitely not conservative.
> >
> > Tom
> >
> > "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> > news:nxHBb.43820$Bk1.4470@fed1read05...
> > > How would you characterize your usual daily driving style?
> Conservative?
> > > Maybe ultra-conservative? Moderate? Hard-accelerations on a regular
> > basis?
> > > Depending on you answer, there could be a reason for the pinging...
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "mabar" <mabar@NOSPAMgbronline.com> wrote in message
> > > news:OoqdnWPSacy_2UqiRVn-sA@gbronline.com...
> > > > My '02 TJ, 6-cyl, auto is pinging under load. Sometimes only slight
> > load.
> > > > Not knocking, but pinging. It has 35000 miles on it. I put in new
> > > Champion
> > > > truck plugs at about 32,000 miles and gapped them correctly to
0.35".
> > > >
> > > > No pinging if I use 89 octane gas, only with 87 octane. Pinging just
> > > started
> > > > a couple of months ago.
> > > >
> > > > Runs fine otherwise. I am guessing re-formulated winter gas
> (Cleveland,
> > > > Ohio) is the problem, but there was absolutely no pinging last
winter.
> > > >
> > > > Any ideas?
> > > >
> > > > Tom
> > > >
> > > >
> > >
> > >
> >
> >
>
>

 

Thanks everyone for your suggestions. I think it might just be the
re-formulated winter gas. On some tanks it pings, on others it doesn't.

Thanks,

Tom

"Jerry Bransford" <jerrypb@mecox.net> wrote in message
news:YEQBb.28$kB6.25@fed1read05...
> Ok, I was going to suggest that it might have a bit of a carbon build-up
in
> the combustion chambers if you drive ultra-conservatively. Carbon can
cause
> pinging by it continuing to glow after the combustion stroke, prematurely
> igniting the next cycle's air-fuel mixture. The cure is to either blow
the
> carbon out by driving ultra-aggressively or cleaning it out with either a
> chemical cleaner or carefully and slowly dribbling 12 to 16 ounces of
water
> into the combustion chamber through the air intake while the engine runs.
>
> Jerry
> --
> Jerry Bransford
> To email, remove 'me' from my email address
> KC6TAY, PP-ASEL
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
>
> "mabar" <mabar@NOSPAMgbronline.com> wrote in message
> news:kfOdneXhsPniI0qiRVn-tw@gbronline.com...
> > I guess moderate. 1/2 city, 1/2 freeway. Some fast starts. Freeway speed
> is
> > usually around 70 mph. Definitely not conservative.
> >
> > Tom
> >
> > "Jerry Bransford" <jerrypb@mecox.net> wrote in message
> > news:nxHBb.43820$Bk1.4470@fed1read05...
> > > How would you characterize your usual daily driving style?
> Conservative?
> > > Maybe ultra-conservative? Moderate? Hard-accelerations on a regular
> > basis?
> > > Depending on you answer, there could be a reason for the pinging...
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > To email, remove 'me' from my email address
> > > KC6TAY, PP-ASEL
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > >
> > > "mabar" <mabar@NOSPAMgbronline.com> wrote in message
> > > news:OoqdnWPSacy_2UqiRVn-sA@gbronline.com...
> > > > My '02 TJ, 6-cyl, auto is pinging under load. Sometimes only slight
> > load.
> > > > Not knocking, but pinging. It has 35000 miles on it. I put in new
> > > Champion
> > > > truck plugs at about 32,000 miles and gapped them correctly to
0.35".
> > > >
> > > > No pinging if I use 89 octane gas, only with 87 octane. Pinging just
> > > started
> > > > a couple of months ago.
> > > >
> > > > Runs fine otherwise. I am guessing re-formulated winter gas
> (Cleveland,
> > > > Ohio) is the problem, but there was absolutely no pinging last
winter.
> > > >
> > > > Any ideas?
> > > >
> > > > Tom
> > > >
> > > >
> > >
> > >
> >
> >
>
>