The one on our 88 rattled when we first got it about 10 years ago. Then
it stopped. The jeep has passed all the emissions to date. I just had
to take the cat off due to a leak and it was a hollow can with nothing
inside.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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)

billy ray wrote:
>
> The converter on my K car rattled for probably 60-80 thousand miles while
> all the time passing the pollution tests. It did quiet down quite a bit
> when the heat shield finally 'fell' off with assistance..
>
> "RoyJ" <spamless@microsoft.net> wrote in message
> news:BDbRg.5135$UG4.297@newsread2.news.pas.earthli nk.net...
> > It's usually the heat shield on the converter or the ceramic substrate
> > inside the conveter. The heat shield can be removed but it's there to keep
> > the floor pan from getting too hot and the grass you parked on from
> > catching on fire. Sounds like you could let it go for a while but
> > eventually it's replacement time.
> >
> > GTK wrote:
> >> '98 TJ 4.0L Manual
> >>
> >> I've got an annoying rattle in my Cat converter at idle speed. Thought
> >> at first it might be the headers. But with engine off, I can go down
> >> under and bang on the Cat and clearly hear the rattle inside. Is the Cat
> >> toast? OBCII finds no codes. Just had emissions inspection 2 months ago
> >> so won't be rechecking for a while. Any recommendations?

 

The one on our 88 rattled when we first got it about 10 years ago. Then
it stopped. The jeep has passed all the emissions to date. I just had
to take the cat off due to a leak and it was a hollow can with nothing
inside.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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)

billy ray wrote:
>
> The converter on my K car rattled for probably 60-80 thousand miles while
> all the time passing the pollution tests. It did quiet down quite a bit
> when the heat shield finally 'fell' off with assistance..
>
> "RoyJ" <spamless@microsoft.net> wrote in message
> news:BDbRg.5135$UG4.297@newsread2.news.pas.earthli nk.net...
> > It's usually the heat shield on the converter or the ceramic substrate
> > inside the conveter. The heat shield can be removed but it's there to keep
> > the floor pan from getting too hot and the grass you parked on from
> > catching on fire. Sounds like you could let it go for a while but
> > eventually it's replacement time.
> >
> > GTK wrote:
> >> '98 TJ 4.0L Manual
> >>
> >> I've got an annoying rattle in my Cat converter at idle speed. Thought
> >> at first it might be the headers. But with engine off, I can go down
> >> under and bang on the Cat and clearly hear the rattle inside. Is the Cat
> >> toast? OBCII finds no codes. Just had emissions inspection 2 months ago
> >> so won't be rechecking for a while. Any recommendations?

 

The one on our 88 rattled when we first got it about 10 years ago. Then
it stopped. The jeep has passed all the emissions to date. I just had
to take the cat off due to a leak and it was a hollow can with nothing
inside.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
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)

billy ray wrote:
>
> The converter on my K car rattled for probably 60-80 thousand miles while
> all the time passing the pollution tests. It did quiet down quite a bit
> when the heat shield finally 'fell' off with assistance..
>
> "RoyJ" <spamless@microsoft.net> wrote in message
> news:BDbRg.5135$UG4.297@newsread2.news.pas.earthli nk.net...
> > It's usually the heat shield on the converter or the ceramic substrate
> > inside the conveter. The heat shield can be removed but it's there to keep
> > the floor pan from getting too hot and the grass you parked on from
> > catching on fire. Sounds like you could let it go for a while but
> > eventually it's replacement time.
> >
> > GTK wrote:
> >> '98 TJ 4.0L Manual
> >>
> >> I've got an annoying rattle in my Cat converter at idle speed. Thought
> >> at first it might be the headers. But with engine off, I can go down
> >> under and bang on the Cat and clearly hear the rattle inside. Is the Cat
> >> toast? OBCII finds no codes. Just had emissions inspection 2 months ago
> >> so won't be rechecking for a while. Any recommendations?

 

Take it off and shake out the loose pieces. If a piece is too big to shake
out, use a screwdriver or chisel to break it. Wear a dust mask and googles
because that crap gets everywhere.

Carl

"GTK" <gkucera@yahoo.com> wrote in message
news:NpbRg.6655$tT6.1041@bignews7.bellsouth.net...
> '98 TJ 4.0L Manual
>
> I've got an annoying rattle in my Cat converter at idle speed. Thought at
> first it might be the headers. But with engine off, I can go down under
> and bang on the Cat and clearly hear the rattle inside. Is the Cat toast?
> OBCII finds no codes. Just had emissions inspection 2 months ago so won't
> be rechecking for a while. Any recommendations?

 

Take it off and shake out the loose pieces. If a piece is too big to shake
out, use a screwdriver or chisel to break it. Wear a dust mask and googles
because that crap gets everywhere.

Carl

"GTK" <gkucera@yahoo.com> wrote in message
news:NpbRg.6655$tT6.1041@bignews7.bellsouth.net...
> '98 TJ 4.0L Manual
>
> I've got an annoying rattle in my Cat converter at idle speed. Thought at
> first it might be the headers. But with engine off, I can go down under
> and bang on the Cat and clearly hear the rattle inside. Is the Cat toast?
> OBCII finds no codes. Just had emissions inspection 2 months ago so won't
> be rechecking for a while. Any recommendations?

 

Take it off and shake out the loose pieces. If a piece is too big to shake
out, use a screwdriver or chisel to break it. Wear a dust mask and googles
because that crap gets everywhere.

Carl

"GTK" <gkucera@yahoo.com> wrote in message
news:NpbRg.6655$tT6.1041@bignews7.bellsouth.net...
> '98 TJ 4.0L Manual
>
> I've got an annoying rattle in my Cat converter at idle speed. Thought at
> first it might be the headers. But with engine off, I can go down under
> and bang on the Cat and clearly hear the rattle inside. Is the Cat toast?
> OBCII finds no codes. Just had emissions inspection 2 months ago so won't
> be rechecking for a while. Any recommendations?

 

In article <45154EFF.F18928C4@sympatico.ca>,
Mike Romain <romainm@sympatico.ca> wrote:
>The one on our 88 rattled when we first got it about 10 years ago. Then
>it stopped. The jeep has passed all the emissions to date. I just had
>to take the cat off due to a leak and it was a hollow can with nothing
>inside.
>
>Mike

It just goes to show that your jeep is tuned. Also, the 88 has some high
limits. I'm sure you put the hollow can back on as planned. :-)


--
Jeeps and dubs and everything's nice...

 

In article <45154EFF.F18928C4@sympatico.ca>,
Mike Romain <romainm@sympatico.ca> wrote:
>The one on our 88 rattled when we first got it about 10 years ago. Then
>it stopped. The jeep has passed all the emissions to date. I just had
>to take the cat off due to a leak and it was a hollow can with nothing
>inside.
>
>Mike

It just goes to show that your jeep is tuned. Also, the 88 has some high
limits. I'm sure you put the hollow can back on as planned. :-)


--
Jeeps and dubs and everything's nice...

 

In article <45154EFF.F18928C4@sympatico.ca>,
Mike Romain <romainm@sympatico.ca> wrote:
>The one on our 88 rattled when we first got it about 10 years ago. Then
>it stopped. The jeep has passed all the emissions to date. I just had
>to take the cat off due to a leak and it was a hollow can with nothing
>inside.
>
>Mike

It just goes to show that your jeep is tuned. Also, the 88 has some high
limits. I'm sure you put the hollow can back on as planned. :-)


--
Jeeps and dubs and everything's nice...