Tracie

On Sep 24, 3:22 pm, Tracie <brain...@upstate.edu> wrote:
> On Sep 24, 3:03 pm, FrankW <fw...@norpak.ca> wrote:
>
>
>
>
>
> > On My 05TJ Rubicon
> > Sometimes not always I can hear a slight ticking sound
> > Kinda like the lifters.
>
> > One day when it was really cold outside (-28C)
> > I started it without the block heater plugged in
> > It made a very loud ticking noise but only for a few seconds
> > Someone somewhere said that it wasn't the lifters but something else.
> > I forget what he said it was. Something not to worry about though.
> > (I think)
> > It might have been in the "Rubicon owners forum"
>
> >http://www.rubiconownersforum.com/phpbb2/index.php
>
> > Try searching there for it if ya want.
>
> > c wrote:
> > > Tracie wrote:
>
> > >> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>
> > >>> Quick question...
>
> > >>> 2006 TJ
> > >>> 6 speed manual
> > >>> 4.0 liter with I-6
> > >>> 31/10.50/15 BFGs
>
> > >>> When moving along at highway speeds or at lower speeds, does anyone
> > >>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
> > >>> not sure if this is pinging or simply just the normal sound of the
> > >>> motor. Keep in mind that I do not use my 6th gear on the highway due
> > >>> to the 31s. I am travelling along at approximately 65 mph and running
> > >>> about 2400-2500 rpms when this sound occurs. If I back off the
> > >>> accelerator and get to about 62-63 mph, the sound stops. It's not a
> > >>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
> > >>> insight?
>
> > >> Sorry but I forgot to add the following....
>
> > >> Since I have upgraded from 28s to 31s, can that cause the engine to
> > >> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
> > >> (I have a 6 speed). In the higher gears after the engine is warm and
> > >> mainly while going uphill (little or big), I get this noise on the
> > >> passenger side that sounds VERY similar to the soft top side window
> > >> 'pinging' against the metal support bow when the wind blows. I can't
> > >> quite distinguish if that's it, or if the engine is pinging because I
> > >> am not 100% sure whether it's coming from the front or the back.
> > >> It's
> > >> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
> > >> and goes intermittently. This noise does NOT happen at city/town
> > >> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
> > >> seemed to be drastically reduced after 1/4 of the tank was used and
> > >> for the rest of the 3/4 of the tank. I have now refilled again with
> > >> the 89 and the noise is back. I have not used 1/4 of the tank yet,
> > >> so
> > >> I don't know if it will be reduced again once I get to that point. I
> > >> do have a tendecy to 'stuff' as much gas in the tank as I can get
> > >> (even after the automatic shuf-off on the spout kicks on). Would
> > >> this
> > >> be causing the problem too?
>
> > > Did you get your gas at the same place both times? They shouldn't have
> > > done it quite yet, but if a station got a tank of winter blend gas, this
> > > could be causing your problem, if it is indeed pinging. By running in
> > > 5th gear, you shouldn't be experiencing ping. The reason I say this is
> > > that you would have heard it before with the stock tires in 6th gear,
> > > but if you weren't listening for it, you may not have heard it.
>
> > > The way you describe it, it sure sounds like pinging, but in reality it
> > > could be someone totally unrelated. Without actually being there to hear
> > > it, the only suggestion I can offer is to try filling up again with 89
> > > octane, but either go back to the original gas station, or if it was the
> > > same station, ask them if they changed to winter blend fuel already.
>
> > > One other thing I just thought of is to see if you can find fuel with no
> > > ethanol added. Some vehicles just don't run decent on the mixed fuels.
> > > It usually says right on the pump if there is ethanol added.
>
> > > Chris- Hide quoted text -
>
> > - Show quoted text -
>
> I did get it at the same station, but I don't know if they have
> switched to winter blend yet. I will try going to a different station
> to see if the car still does this. I don't know if this makes any
> difference, but I did notice it since the day I drove it off the lot
> (bought it brand new with 74 miles on her).
>
> Thanks for the link to the forum. I think I'll scout around in there
> and see what I can find. : D- Hide quoted text -
>
> - Show quoted text -

If the exhaust is sitting close enough, is that something I can re-
route, or do you just live with it? It isn't anything I can't live
with. I was just curious as to what is causing the noise. But like I
said in the earlier post, I DO remember hearing it even with the stock
tires since the day I drove her off the lot brand new. It may even be
characteristic of the type of engine that is in it (NSG 370?) or
something like that. I'll check underneath to see if there is
anything loose that may be rattling.

The only other noise that she makes that I can't figure out is the
single pop she makes when turning corners (left ONLY), or once in a
while when going straight. I have a feeling it has something to do
with the steering colum. I distinctly hear it up front towards the
center. She doesn't do it all the time, only when feels like it.
Other than that (and the possible engine noise -- if not normal), she
runs like a dream.

Carl S

Sno,

I, for one, appreciate your knowledge and contribution to the group, but
statements like "You would know this if you had any realy knowledge of
this." and "Of course you would because you are clueless here" are
irrelevant and worthless.

Carl


"SnoMan" <admin@snoman.com> wrote in message
news:rtsff3dqj6qg7qf4imrf28v8c2uo0ivdi1@4ax.com...
> On Mon, 24 Sep 2007 13:07:48 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>>I highly doubt you can make a 4.0 engine ping at 2500 rpm under almost
>>any driving condition.
>
> Engine are more prone to ping at lower RPMs when rate of expansion is
> slower and load is high. You would know this if you had any realy
> knowledge of this.
>
>>
>>At that rpm, you are way up in the torque curve and should have tons of
>>power to accelerate uphill fast even using regular gas.
>
> All the more reason it can ping because when engine is making good
> torque it is near its VE peak (Volumetric Efficency) where effective
> pumping pressure are the highest for its mixtures being burned and
> these higher pressure need more octane
>
>>
>>My Jeeps have tons of power when fully loaded for camping at that rpm,
>>they will 'hold' 2300 rpm at least on anything.
>
> I take this with a grain of salt since you think 3.31 gears with 33's
> is a great combo, you really do not have a clue what good pulling
> power is. (you have very low standards)
>
>>
>>I would be suspecting something else is making the noise.
>
> Of course you would because you are clueless here
>
>>
>>I can only start a ping if I am way down into the mid teens for rpm or
>>have gas my CJ7's 258 doesn't like in it. (old carb engine, apples and
>>oranges to a 4.0's systems)
>
> How much octane you need depends on engine temp, air temp, load,
> humidity, altitude and well as deposits in engine from age and minute
> oil usage too which lowers octane needs. Octane needs are not constant
> and the trick is to use a high enough octane to meet maximum needs.
> What people need themselves can vary and is not universal 87 does it
> all as clueless here suggests. BTW, I do not use 87 in anything made
> since early 80's.
>
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's - Gone to the rust pile...
>>Canadian Off Road Trips Photos: Non members can still view!
>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>(More Off Road album links at bottom of the view page)
>>
>>Tracie wrote:
>>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>>>> Quick question...
>>>>
>>>> 2006 TJ
>>>> 6 speed manual
>>>> 4.0 liter with I-6
>>>> 31/10.50/15 BFGs
>>>>
>>>> When moving along at highway speeds or at lower speeds, does anyone
>>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>>>> not sure if this is pinging or simply just the normal sound of the
>>>> motor. Keep in mind that I do not use my 6th gear on the highway due
>>>> to the 31s. I am travelling along at approximately 65 mph and running
>>>> about 2400-2500 rpms when this sound occurs. If I back off the
>>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>>>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>>>> insight?
>>>
>>> Sorry but I forgot to add the following....
>>>
>>> Since I have upgraded from 28s to 31s, can that cause the engine to
>>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>>> (I have a 6 speed). In the higher gears after the engine is warm and
>>> mainly while going uphill (little or big), I get this noise on the
>>> passenger side that sounds VERY similar to the soft top side window
>>> 'pinging' against the metal support bow when the wind blows. I can't
>>> quite distinguish if that's it, or if the engine is pinging because I
>>> am not 100% sure whether it's coming from the front or the back.
>>> It's
>>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>>> and goes intermittently. This noise does NOT happen at city/town
>>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>>> seemed to be drastically reduced after 1/4 of the tank was used and
>>> for the rest of the 3/4 of the tank. I have now refilled again with
>>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>>> so
>>> I don't know if it will be reduced again once I get to that point. I
>>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>>> (even after the automatic shuf-off on the spout kicks on). Would
>>> this
>>> be causing the problem too?
>>>
> -----------------
> TheSnoMan.com

Carl S

Sno,

I, for one, appreciate your knowledge and contribution to the group, but
statements like "You would know this if you had any realy knowledge of
this." and "Of course you would because you are clueless here" are
irrelevant and worthless.

Carl


"SnoMan" <admin@snoman.com> wrote in message
news:rtsff3dqj6qg7qf4imrf28v8c2uo0ivdi1@4ax.com...
> On Mon, 24 Sep 2007 13:07:48 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>>I highly doubt you can make a 4.0 engine ping at 2500 rpm under almost
>>any driving condition.
>
> Engine are more prone to ping at lower RPMs when rate of expansion is
> slower and load is high. You would know this if you had any realy
> knowledge of this.
>
>>
>>At that rpm, you are way up in the torque curve and should have tons of
>>power to accelerate uphill fast even using regular gas.
>
> All the more reason it can ping because when engine is making good
> torque it is near its VE peak (Volumetric Efficency) where effective
> pumping pressure are the highest for its mixtures being burned and
> these higher pressure need more octane
>
>>
>>My Jeeps have tons of power when fully loaded for camping at that rpm,
>>they will 'hold' 2300 rpm at least on anything.
>
> I take this with a grain of salt since you think 3.31 gears with 33's
> is a great combo, you really do not have a clue what good pulling
> power is. (you have very low standards)
>
>>
>>I would be suspecting something else is making the noise.
>
> Of course you would because you are clueless here
>
>>
>>I can only start a ping if I am way down into the mid teens for rpm or
>>have gas my CJ7's 258 doesn't like in it. (old carb engine, apples and
>>oranges to a 4.0's systems)
>
> How much octane you need depends on engine temp, air temp, load,
> humidity, altitude and well as deposits in engine from age and minute
> oil usage too which lowers octane needs. Octane needs are not constant
> and the trick is to use a high enough octane to meet maximum needs.
> What people need themselves can vary and is not universal 87 does it
> all as clueless here suggests. BTW, I do not use 87 in anything made
> since early 80's.
>
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's - Gone to the rust pile...
>>Canadian Off Road Trips Photos: Non members can still view!
>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>(More Off Road album links at bottom of the view page)
>>
>>Tracie wrote:
>>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>>>> Quick question...
>>>>
>>>> 2006 TJ
>>>> 6 speed manual
>>>> 4.0 liter with I-6
>>>> 31/10.50/15 BFGs
>>>>
>>>> When moving along at highway speeds or at lower speeds, does anyone
>>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>>>> not sure if this is pinging or simply just the normal sound of the
>>>> motor. Keep in mind that I do not use my 6th gear on the highway due
>>>> to the 31s. I am travelling along at approximately 65 mph and running
>>>> about 2400-2500 rpms when this sound occurs. If I back off the
>>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>>>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>>>> insight?
>>>
>>> Sorry but I forgot to add the following....
>>>
>>> Since I have upgraded from 28s to 31s, can that cause the engine to
>>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>>> (I have a 6 speed). In the higher gears after the engine is warm and
>>> mainly while going uphill (little or big), I get this noise on the
>>> passenger side that sounds VERY similar to the soft top side window
>>> 'pinging' against the metal support bow when the wind blows. I can't
>>> quite distinguish if that's it, or if the engine is pinging because I
>>> am not 100% sure whether it's coming from the front or the back.
>>> It's
>>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>>> and goes intermittently. This noise does NOT happen at city/town
>>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>>> seemed to be drastically reduced after 1/4 of the tank was used and
>>> for the rest of the 3/4 of the tank. I have now refilled again with
>>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>>> so
>>> I don't know if it will be reduced again once I get to that point. I
>>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>>> (even after the automatic shuf-off on the spout kicks on). Would
>>> this
>>> be causing the problem too?
>>>
> -----------------
> TheSnoMan.com

Carl S

Sno,

I, for one, appreciate your knowledge and contribution to the group, but
statements like "You would know this if you had any realy knowledge of
this." and "Of course you would because you are clueless here" are
irrelevant and worthless.

Carl


"SnoMan" <admin@snoman.com> wrote in message
news:rtsff3dqj6qg7qf4imrf28v8c2uo0ivdi1@4ax.com...
> On Mon, 24 Sep 2007 13:07:48 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>>I highly doubt you can make a 4.0 engine ping at 2500 rpm under almost
>>any driving condition.
>
> Engine are more prone to ping at lower RPMs when rate of expansion is
> slower and load is high. You would know this if you had any realy
> knowledge of this.
>
>>
>>At that rpm, you are way up in the torque curve and should have tons of
>>power to accelerate uphill fast even using regular gas.
>
> All the more reason it can ping because when engine is making good
> torque it is near its VE peak (Volumetric Efficency) where effective
> pumping pressure are the highest for its mixtures being burned and
> these higher pressure need more octane
>
>>
>>My Jeeps have tons of power when fully loaded for camping at that rpm,
>>they will 'hold' 2300 rpm at least on anything.
>
> I take this with a grain of salt since you think 3.31 gears with 33's
> is a great combo, you really do not have a clue what good pulling
> power is. (you have very low standards)
>
>>
>>I would be suspecting something else is making the noise.
>
> Of course you would because you are clueless here
>
>>
>>I can only start a ping if I am way down into the mid teens for rpm or
>>have gas my CJ7's 258 doesn't like in it. (old carb engine, apples and
>>oranges to a 4.0's systems)
>
> How much octane you need depends on engine temp, air temp, load,
> humidity, altitude and well as deposits in engine from age and minute
> oil usage too which lowers octane needs. Octane needs are not constant
> and the trick is to use a high enough octane to meet maximum needs.
> What people need themselves can vary and is not universal 87 does it
> all as clueless here suggests. BTW, I do not use 87 in anything made
> since early 80's.
>
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's - Gone to the rust pile...
>>Canadian Off Road Trips Photos: Non members can still view!
>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>(More Off Road album links at bottom of the view page)
>>
>>Tracie wrote:
>>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>>>> Quick question...
>>>>
>>>> 2006 TJ
>>>> 6 speed manual
>>>> 4.0 liter with I-6
>>>> 31/10.50/15 BFGs
>>>>
>>>> When moving along at highway speeds or at lower speeds, does anyone
>>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>>>> not sure if this is pinging or simply just the normal sound of the
>>>> motor. Keep in mind that I do not use my 6th gear on the highway due
>>>> to the 31s. I am travelling along at approximately 65 mph and running
>>>> about 2400-2500 rpms when this sound occurs. If I back off the
>>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>>>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>>>> insight?
>>>
>>> Sorry but I forgot to add the following....
>>>
>>> Since I have upgraded from 28s to 31s, can that cause the engine to
>>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>>> (I have a 6 speed). In the higher gears after the engine is warm and
>>> mainly while going uphill (little or big), I get this noise on the
>>> passenger side that sounds VERY similar to the soft top side window
>>> 'pinging' against the metal support bow when the wind blows. I can't
>>> quite distinguish if that's it, or if the engine is pinging because I
>>> am not 100% sure whether it's coming from the front or the back.
>>> It's
>>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>>> and goes intermittently. This noise does NOT happen at city/town
>>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>>> seemed to be drastically reduced after 1/4 of the tank was used and
>>> for the rest of the 3/4 of the tank. I have now refilled again with
>>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>>> so
>>> I don't know if it will be reduced again once I get to that point. I
>>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>>> (even after the automatic shuf-off on the spout kicks on). Would
>>> this
>>> be causing the problem too?
>>>
> -----------------
> TheSnoMan.com

Carl S

Sno,

I, for one, appreciate your knowledge and contribution to the group, but
statements like "You would know this if you had any realy knowledge of
this." and "Of course you would because you are clueless here" are
irrelevant and worthless.

Carl


"SnoMan" <admin@snoman.com> wrote in message
news:rtsff3dqj6qg7qf4imrf28v8c2uo0ivdi1@4ax.com...
> On Mon, 24 Sep 2007 13:07:48 -0400, Mike Romain <romainm@sympatico.ca>
> wrote:
>
>>I highly doubt you can make a 4.0 engine ping at 2500 rpm under almost
>>any driving condition.
>
> Engine are more prone to ping at lower RPMs when rate of expansion is
> slower and load is high. You would know this if you had any realy
> knowledge of this.
>
>>
>>At that rpm, you are way up in the torque curve and should have tons of
>>power to accelerate uphill fast even using regular gas.
>
> All the more reason it can ping because when engine is making good
> torque it is near its VE peak (Volumetric Efficency) where effective
> pumping pressure are the highest for its mixtures being burned and
> these higher pressure need more octane
>
>>
>>My Jeeps have tons of power when fully loaded for camping at that rpm,
>>they will 'hold' 2300 rpm at least on anything.
>
> I take this with a grain of salt since you think 3.31 gears with 33's
> is a great combo, you really do not have a clue what good pulling
> power is. (you have very low standards)
>
>>
>>I would be suspecting something else is making the noise.
>
> Of course you would because you are clueless here
>
>>
>>I can only start a ping if I am way down into the mid teens for rpm or
>>have gas my CJ7's 258 doesn't like in it. (old carb engine, apples and
>>oranges to a 4.0's systems)
>
> How much octane you need depends on engine temp, air temp, load,
> humidity, altitude and well as deposits in engine from age and minute
> oil usage too which lowers octane needs. Octane needs are not constant
> and the trick is to use a high enough octane to meet maximum needs.
> What people need themselves can vary and is not universal 87 does it
> all as clueless here suggests. BTW, I do not use 87 in anything made
> since early 80's.
>
>>
>>Mike
>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>>88 Cherokee 235 BFG AT's - Gone to the rust pile...
>>Canadian Off Road Trips Photos: Non members can still view!
>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
>>(More Off Road album links at bottom of the view page)
>>
>>Tracie wrote:
>>> On Sep 24, 12:25 pm, Tracie <brain...@upstate.edu> wrote:
>>>> Quick question...
>>>>
>>>> 2006 TJ
>>>> 6 speed manual
>>>> 4.0 liter with I-6
>>>> 31/10.50/15 BFGs
>>>>
>>>> When moving along at highway speeds or at lower speeds, does anyone
>>>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>>>> not sure if this is pinging or simply just the normal sound of the
>>>> motor. Keep in mind that I do not use my 6th gear on the highway due
>>>> to the 31s. I am travelling along at approximately 65 mph and running
>>>> about 2400-2500 rpms when this sound occurs. If I back off the
>>>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>>>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>>>> insight?
>>>
>>> Sorry but I forgot to add the following....
>>>
>>> Since I have upgraded from 28s to 31s, can that cause the engine to
>>> lug or ping? I generally keep the RPM's around 2200-2400 in 5th gear
>>> (I have a 6 speed). In the higher gears after the engine is warm and
>>> mainly while going uphill (little or big), I get this noise on the
>>> passenger side that sounds VERY similar to the soft top side window
>>> 'pinging' against the metal support bow when the wind blows. I can't
>>> quite distinguish if that's it, or if the engine is pinging because I
>>> am not 100% sure whether it's coming from the front or the back.
>>> It's
>>> a high-pitched noise. It is NOT rhythmic or steady, but rather comes
>>> and goes intermittently. This noise does NOT happen at city/town
>>> speeds of 50 mph or lower. I ran a tank of 89 through her, and it
>>> seemed to be drastically reduced after 1/4 of the tank was used and
>>> for the rest of the 3/4 of the tank. I have now refilled again with
>>> the 89 and the noise is back. I have not used 1/4 of the tank yet,
>>> so
>>> I don't know if it will be reduced again once I get to that point. I
>>> do have a tendecy to 'stuff' as much gas in the tank as I can get
>>> (even after the automatic shuf-off on the spout kicks on). Would
>>> this
>>> be causing the problem too?
>>>
> -----------------
> TheSnoMan.com

Mike Romain

Will Honea wrote:
> Tracie wrote:
>
>> Quick question...
>>
>> 2006 TJ
>> 6 speed manual
>> 4.0 liter with I-6
>> 31/10.50/15 BFGs
>>
>> When moving along at highway speeds or at lower speeds, does anyone
>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>> not sure if this is pinging or simply just the normal sound of the
>> motor. Keep in mind that I do not use my 6th gear on the highway due
>> to the 31s. I am travelling along at approximately 65 mph and running
>> about 2400-2500 rpms when this sound occurs. If I back off the
>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>> insight?
>
> Tracie, have you considered a rattle from the exhaust hitting something? If
> the exhaust plumbing sits close enough, it will rattle when the engine rpm
> is just right to resonate. Same thing will cause the heat shield on the
> cat to buzz under specific conditions. Given the RPM range you describe,
> I'd be looking for mechanical noise as well as for ping.
>
> The definitive answer about ping would be a full tank of high test gas under
> identical conditions. No noise, likely ping. Noise still there, rattle
> time.

I will second the CAT's heat shield. That is located under the
passenger footwell still isn't it?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mike Romain

Will Honea wrote:
> Tracie wrote:
>
>> Quick question...
>>
>> 2006 TJ
>> 6 speed manual
>> 4.0 liter with I-6
>> 31/10.50/15 BFGs
>>
>> When moving along at highway speeds or at lower speeds, does anyone
>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>> not sure if this is pinging or simply just the normal sound of the
>> motor. Keep in mind that I do not use my 6th gear on the highway due
>> to the 31s. I am travelling along at approximately 65 mph and running
>> about 2400-2500 rpms when this sound occurs. If I back off the
>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>> insight?
>
> Tracie, have you considered a rattle from the exhaust hitting something? If
> the exhaust plumbing sits close enough, it will rattle when the engine rpm
> is just right to resonate. Same thing will cause the heat shield on the
> cat to buzz under specific conditions. Given the RPM range you describe,
> I'd be looking for mechanical noise as well as for ping.
>
> The definitive answer about ping would be a full tank of high test gas under
> identical conditions. No noise, likely ping. Noise still there, rattle
> time.

I will second the CAT's heat shield. That is located under the
passenger footwell still isn't it?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mike Romain

Will Honea wrote:
> Tracie wrote:
>
>> Quick question...
>>
>> 2006 TJ
>> 6 speed manual
>> 4.0 liter with I-6
>> 31/10.50/15 BFGs
>>
>> When moving along at highway speeds or at lower speeds, does anyone
>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>> not sure if this is pinging or simply just the normal sound of the
>> motor. Keep in mind that I do not use my 6th gear on the highway due
>> to the 31s. I am travelling along at approximately 65 mph and running
>> about 2400-2500 rpms when this sound occurs. If I back off the
>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>> insight?
>
> Tracie, have you considered a rattle from the exhaust hitting something? If
> the exhaust plumbing sits close enough, it will rattle when the engine rpm
> is just right to resonate. Same thing will cause the heat shield on the
> cat to buzz under specific conditions. Given the RPM range you describe,
> I'd be looking for mechanical noise as well as for ping.
>
> The definitive answer about ping would be a full tank of high test gas under
> identical conditions. No noise, likely ping. Noise still there, rattle
> time.

I will second the CAT's heat shield. That is located under the
passenger footwell still isn't it?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mike Romain

Will Honea wrote:
> Tracie wrote:
>
>> Quick question...
>>
>> 2006 TJ
>> 6 speed manual
>> 4.0 liter with I-6
>> 31/10.50/15 BFGs
>>
>> When moving along at highway speeds or at lower speeds, does anyone
>> else's Wrangler engine sound like a 'rattlesnake' is in there? I am
>> not sure if this is pinging or simply just the normal sound of the
>> motor. Keep in mind that I do not use my 6th gear on the highway due
>> to the 31s. I am travelling along at approximately 65 mph and running
>> about 2400-2500 rpms when this sound occurs. If I back off the
>> accelerator and get to about 62-63 mph, the sound stops. It's not a
>> metallic type sound. Just a 'rattling' or 'purring' type sound. Any
>> insight?
>
> Tracie, have you considered a rattle from the exhaust hitting something? If
> the exhaust plumbing sits close enough, it will rattle when the engine rpm
> is just right to resonate. Same thing will cause the heat shield on the
> cat to buzz under specific conditions. Given the RPM range you describe,
> I'd be looking for mechanical noise as well as for ping.
>
> The definitive answer about ping would be a full tank of high test gas under
> identical conditions. No noise, likely ping. Noise still there, rattle
> time.

I will second the CAT's heat shield. That is located under the
passenger footwell still isn't it?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Matt Macchiarolo

>
> SnoMan --
> You're right, I really don't have much knowledge of what causes
> pinging. I really do appreciate the fact that you're not being rude
> about it. I was just a little confused though when you said engines
> are more likely to ping at lower RPMs, then in the next paragraph, you
> said that higher RPMs would be all the more reason an engine would
> ping. Those statements contradict themselves (unless I am missing
> something that I don't quite understand).

Tracie, Mike was basically telling you what you are hearing was probably not
engine pinging. Snoman was trying to contradict Mike because that's his
mission in life when it comes to this newsgroup. Welcome to the club. :-)

Snoman has a real problem with Mike Romain, and he's only here because he
has stalked Mike to here from another other group. Mike has forgotten more
about real-world Jeeps than Sno will ever know, and is one of the most
helpful folks here.

Sno will undoubtedly make an "I've had Jeeps for a million years and
therefore Mike is wrong and I know everything" statement, but know that Sno
has only come to this group relatively recently and more often than not
enters a thread only when he's trying to make Mike look like an ***. So it's
really his advice that should be taken with a grain of salt.

>
> Any input regarding the 'rattlesnake noise'? It's just a soft
> 'purring' type noise. Not real loud at all, but does quit when I back
> off the accelerator just a touch.
>
Could it be your new tires?