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Car Forum / Jeep / September 2006Rattle in my Cat. '98 TJ
'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? 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. > '98 TJ 4.0L Manual > [quoted text clipped - 3 lines] > Cat toast? OBCII finds no codes. Just had emissions inspection 2 > months ago so won't be rechecking for a while. Any recommendations? 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.. > 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 [quoted text clipped - 9 lines] >> 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/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > 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 [quoted text clipped - 13 lines] > >> 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 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. :-)  SignatureJeeps and dubs and everything's nice... The catalytic converter media has begun to break into pieces. That, however, does not necessarily hinder it from performing its duties. It may continue to function properly for many more years until the pieces rattling around are small enough to escape the converter. If the rattling bothers you there are replacement converters available at your corner auto-parts store or can be installed by your corner mom and pop muffler shop. > '98 TJ 4.0L Manual > [quoted text clipped - 3 lines] > 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 > '98 TJ 4.0L Manual > [quoted text clipped - 3 lines] > OBCII finds no codes. Just had emissions inspection 2 months ago so won't > be rechecking for a while. Any recommendations? |
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