'02 TJ pinging under load
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 |
Re: '02 TJ pinging under load
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.cox.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 > > |
Re: '02 TJ pinging under load
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.cox.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 > > |
Re: '02 TJ pinging under load
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.cox.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 > > |
Re: '02 TJ pinging under load
Hi Tom,
Switch oil companies, until you find one with good cleaner additives, and maybe a compromise in octane for the price you're willing to pay. Don't force it to ping: http://www.stanford.edu/~bmoses/knock.html God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ mabar wrote: > > 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 |
Re: '02 TJ pinging under load
Hi Tom,
Switch oil companies, until you find one with good cleaner additives, and maybe a compromise in octane for the price you're willing to pay. Don't force it to ping: http://www.stanford.edu/~bmoses/knock.html God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ mabar wrote: > > 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 |
Re: '02 TJ pinging under load
Hi Tom,
Switch oil companies, until you find one with good cleaner additives, and maybe a compromise in octane for the price you're willing to pay. Don't force it to ping: http://www.stanford.edu/~bmoses/knock.html God Bless America, ßill O|||||||O mailto:-------------------- http://www.----------.com/ mabar wrote: > > 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 |
Re: '02 TJ pinging under load
Roughly 12/10/03 08:04, mabar's monkeys randomly typed:
> 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? You might try using a different brand and hope you get lucky. Or try the middle cost semi-premium. The missus' '95 4.0 does the same thing under light load at low-moderate rpm where the transmission doesn't downshift under moderate accel. Dealer claims it is harmless but it is annoying enough I just step up one grade at lower elevations. -- Fan of the dumbest team in America. |
Re: '02 TJ pinging under load
Roughly 12/10/03 08:04, mabar's monkeys randomly typed:
> 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? You might try using a different brand and hope you get lucky. Or try the middle cost semi-premium. The missus' '95 4.0 does the same thing under light load at low-moderate rpm where the transmission doesn't downshift under moderate accel. Dealer claims it is harmless but it is annoying enough I just step up one grade at lower elevations. -- Fan of the dumbest team in America. |
Re: '02 TJ pinging under load
Roughly 12/10/03 08:04, mabar's monkeys randomly typed:
> 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? You might try using a different brand and hope you get lucky. Or try the middle cost semi-premium. The missus' '95 4.0 does the same thing under light load at low-moderate rpm where the transmission doesn't downshift under moderate accel. Dealer claims it is harmless but it is annoying enough I just step up one grade at lower elevations. -- Fan of the dumbest team in America. |
Re: '02 TJ pinging under load
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$Bk1.4470@fed1read05... > How would you characterize your usual daily driving style? Conservative? > Maybe ultra-conservative? Moderate? Hard-accelerations on a regular basis? > Depending on you answer, there could be a reason for the pinging... > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > KC6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "mabar" <mabar@NOSPAMgbronline.com> wrote in message > news:OoqdnWPSacy_2UqiRVn-sA@gbronline.com... > > My '02 TJ, 6-cyl, auto is pinging under load. Sometimes only slight load. > > Not knocking, but pinging. It has 35000 miles on it. I put in new > Champion > > truck plugs at about 32,000 miles and gapped them correctly to 0.35". > > > > No pinging if I use 89 octane gas, only with 87 octane. Pinging just > started > > a couple of months ago. > > > > Runs fine otherwise. I am guessing re-formulated winter gas (Cleveland, > > Ohio) is the problem, but there was absolutely no pinging last winter. > > > > Any ideas? > > > > Tom > > > > > > |
Re: '02 TJ pinging under load
I guess moderate. 1/2 city, 1/2 freeway. Some fast starts. Freeway speed is
usually around 70 mph. Definitely not conservative. Tom "Jerry Bransford" <jerrypb@mecox.net> wrote in message news:nxHBb.43820$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.cox.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 > > > > > > |
Re: '02 TJ pinging under load
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.cox.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 > > > > > > |
Re: '02 TJ pinging under load
My 5 month old '03 did the same thing recently when it started to get
colder. I suspect the winter gas as well. Using 89 stopped it for me too. I tried to go back to 87 for a couple of tanks but the pinging came back. I'm going to just feed it 89 until spring. I suppose the timing could be adjusted, but then I'd have to change that back when it gets warmer or deal with the resulting power loss or excessive emmisions. mabar wrote: > 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 > > |
Re: '02 TJ pinging under load
My 5 month old '03 did the same thing recently when it started to get
colder. I suspect the winter gas as well. Using 89 stopped it for me too. I tried to go back to 87 for a couple of tanks but the pinging came back. I'm going to just feed it 89 until spring. I suppose the timing could be adjusted, but then I'd have to change that back when it gets warmer or deal with the resulting power loss or excessive emmisions. mabar wrote: > 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 > > |
Re: '02 TJ pinging under load
My 5 month old '03 did the same thing recently when it started to get
colder. I suspect the winter gas as well. Using 89 stopped it for me too. I tried to go back to 87 for a couple of tanks but the pinging came back. I'm going to just feed it 89 until spring. I suppose the timing could be adjusted, but then I'd have to change that back when it gets warmer or deal with the resulting power loss or excessive emmisions. mabar wrote: > 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 > > |
Re: '02 TJ pinging under load
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.cox.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.cox.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 > > > > > > > > > > > > |
Re: '02 TJ pinging under load
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.cox.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.cox.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 > > > > > > > > > > > > |
Re: '02 TJ pinging under load
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.cox.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.cox.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 > > > > > > > > > > > > |
Re: '02 TJ pinging under load
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$kB6.25@fed1read05... > Ok, I was going to suggest that it might have a bit of a carbon build-up in > the combustion chambers if you drive ultra-conservatively. Carbon can cause > pinging by it continuing to glow after the combustion stroke, prematurely > igniting the next cycle's air-fuel mixture. The cure is to either blow the > carbon out by driving ultra-aggressively or cleaning it out with either a > chemical cleaner or carefully and slowly dribbling 12 to 16 ounces of water > into the combustion chamber through the air intake while the engine runs. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > KC6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "mabar" <mabar@NOSPAMgbronline.com> wrote in message > news:kfOdneXhsPniI0qiRVn-tw@gbronline.com... > > I guess moderate. 1/2 city, 1/2 freeway. Some fast starts. Freeway speed > is > > usually around 70 mph. Definitely not conservative. > > > > Tom > > > > "Jerry Bransford" <jerrypb@mecox.net> wrote in message > > news:nxHBb.43820$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.cox.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 > > > > > > > > > > > > > > > > > > > > |
Re: '02 TJ pinging under load
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$kB6.25@fed1read05... > Ok, I was going to suggest that it might have a bit of a carbon build-up in > the combustion chambers if you drive ultra-conservatively. Carbon can cause > pinging by it continuing to glow after the combustion stroke, prematurely > igniting the next cycle's air-fuel mixture. The cure is to either blow the > carbon out by driving ultra-aggressively or cleaning it out with either a > chemical cleaner or carefully and slowly dribbling 12 to 16 ounces of water > into the combustion chamber through the air intake while the engine runs. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > KC6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "mabar" <mabar@NOSPAMgbronline.com> wrote in message > news:kfOdneXhsPniI0qiRVn-tw@gbronline.com... > > I guess moderate. 1/2 city, 1/2 freeway. Some fast starts. Freeway speed > is > > usually around 70 mph. Definitely not conservative. > > > > Tom > > > > "Jerry Bransford" <jerrypb@mecox.net> wrote in message > > news:nxHBb.43820$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.cox.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 > > > > > > > > > > > > > > > > > > > > |
Re: '02 TJ pinging under load
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$kB6.25@fed1read05... > Ok, I was going to suggest that it might have a bit of a carbon build-up in > the combustion chambers if you drive ultra-conservatively. Carbon can cause > pinging by it continuing to glow after the combustion stroke, prematurely > igniting the next cycle's air-fuel mixture. The cure is to either blow the > carbon out by driving ultra-aggressively or cleaning it out with either a > chemical cleaner or carefully and slowly dribbling 12 to 16 ounces of water > into the combustion chamber through the air intake while the engine runs. > > Jerry > -- > Jerry Bransford > To email, remove 'me' from my email address > KC6TAY, PP-ASEL > See the Geezer Jeep at > http://members.cox.net/jerrypb/ > > "mabar" <mabar@NOSPAMgbronline.com> wrote in message > news:kfOdneXhsPniI0qiRVn-tw@gbronline.com... > > I guess moderate. 1/2 city, 1/2 freeway. Some fast starts. Freeway speed > is > > usually around 70 mph. Definitely not conservative. > > > > Tom > > > > "Jerry Bransford" <jerrypb@mecox.net> wrote in message > > news:nxHBb.43820$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.cox.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 > > > > > > > > > > > > > > > > > > > > |
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