Handywired

It's a long shot, but my catalytic converter, when it first started it's death
rattle, sounded enough like low-end noise (like when you lug the engine bad) to
scare the bejeezus out of me.

-jeff

>I have a 98 TJ with the 4.0L engine, with 45,000 miles on it. Just
>recently, I'd say, within the past 6 months or so, I started to
>develop a noise in my engine. It doesn't happen when at idle, or at
>least, I can't hear it. It only happens when the engine is under load.
>If I "lug" the engine, this sound is *VERY* apparent. When I first
>began to hear it, it was fairly quiet. I had to strain to hear it. (it
>was on the highway in a soft-top :) but over time, it's gotten much
>louder.

Handywired

It's a long shot, but my catalytic converter, when it first started it's death
rattle, sounded enough like low-end noise (like when you lug the engine bad) to
scare the bejeezus out of me.

-jeff

>I have a 98 TJ with the 4.0L engine, with 45,000 miles on it. Just
>recently, I'd say, within the past 6 months or so, I started to
>develop a noise in my engine. It doesn't happen when at idle, or at
>least, I can't hear it. It only happens when the engine is under load.
>If I "lug" the engine, this sound is *VERY* apparent. When I first
>began to hear it, it was fairly quiet. I had to strain to hear it. (it
>was on the highway in a soft-top :) but over time, it's gotten much
>louder.

Handywired

It's a long shot, but my catalytic converter, when it first started it's death
rattle, sounded enough like low-end noise (like when you lug the engine bad) to
scare the bejeezus out of me.

-jeff

>I have a 98 TJ with the 4.0L engine, with 45,000 miles on it. Just
>recently, I'd say, within the past 6 months or so, I started to
>develop a noise in my engine. It doesn't happen when at idle, or at
>least, I can't hear it. It only happens when the engine is under load.
>If I "lug" the engine, this sound is *VERY* apparent. When I first
>began to hear it, it was fairly quiet. I had to strain to hear it. (it
>was on the highway in a soft-top :) but over time, it's gotten much
>louder.

Dave McGlynn

I tried running the higher octane fuel for one tankful, but got no
results. I should have said that in the original post. Could it take a
few tankfuls? Are those off-the-shelf "octane-booster" additives
useful in this situation?



L.W.(ßill) ------ III <----------@***.net> wrote in message news:<40906368.C5D34917@***.net>...
> I think you're right, you have spark knock, your engine may no
> longer run at the correct ignition timing, seeing its controlled be a
> computer, we may not reset it from stock without ARB III scanner. So
> choose another major fuel, maybe run there higher octane for there
> better additives design to clean the injectors and cut the carbon build
> that's now retaining the combustion heat and dieseling. Until you find
> the right gasoline ease up on the throttle, remember noise equals
> damage:
> http://www.flavorandfortune.com/pict...s/DSCF1213.jpg
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

Dave McGlynn

I tried running the higher octane fuel for one tankful, but got no
results. I should have said that in the original post. Could it take a
few tankfuls? Are those off-the-shelf "octane-booster" additives
useful in this situation?



L.W.(ßill) ------ III <----------@***.net> wrote in message news:<40906368.C5D34917@***.net>...
> I think you're right, you have spark knock, your engine may no
> longer run at the correct ignition timing, seeing its controlled be a
> computer, we may not reset it from stock without ARB III scanner. So
> choose another major fuel, maybe run there higher octane for there
> better additives design to clean the injectors and cut the carbon build
> that's now retaining the combustion heat and dieseling. Until you find
> the right gasoline ease up on the throttle, remember noise equals
> damage:
> http://www.flavorandfortune.com/pict...s/DSCF1213.jpg
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

Dave McGlynn

I tried running the higher octane fuel for one tankful, but got no
results. I should have said that in the original post. Could it take a
few tankfuls? Are those off-the-shelf "octane-booster" additives
useful in this situation?



L.W.(ßill) ------ III <----------@***.net> wrote in message news:<40906368.C5D34917@***.net>...
> I think you're right, you have spark knock, your engine may no
> longer run at the correct ignition timing, seeing its controlled be a
> computer, we may not reset it from stock without ARB III scanner. So
> choose another major fuel, maybe run there higher octane for there
> better additives design to clean the injectors and cut the carbon build
> that's now retaining the combustion heat and dieseling. Until you find
> the right gasoline ease up on the throttle, remember noise equals
> damage:
> http://www.flavorandfortune.com/pict...s/DSCF1213.jpg
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

Dave McGlynn

I tried running the higher octane fuel for one tankful, but got no
results. I should have said that in the original post. Could it take a
few tankfuls? Are those off-the-shelf "octane-booster" additives
useful in this situation?



L.W.(ßill) ------ III <----------@***.net> wrote in message news:<40906368.C5D34917@***.net>...
> I think you're right, you have spark knock, your engine may no
> longer run at the correct ignition timing, seeing its controlled be a
> computer, we may not reset it from stock without ARB III scanner. So
> choose another major fuel, maybe run there higher octane for there
> better additives design to clean the injectors and cut the carbon build
> that's now retaining the combustion heat and dieseling. Until you find
> the right gasoline ease up on the throttle, remember noise equals
> damage:
> http://www.flavorandfortune.com/pict...s/DSCF1213.jpg
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

Dave McGlynn

Also, I just read a couple articles on here about using a full can of
carb-cleaner down the throttle body to rid the engine of carbon.. Is
this a good idea?

Dave McGlynn

Also, I just read a couple articles on here about using a full can of
carb-cleaner down the throttle body to rid the engine of carbon.. Is
this a good idea?

Dave McGlynn

Also, I just read a couple articles on here about using a full can of
carb-cleaner down the throttle body to rid the engine of carbon.. Is
this a good idea?