I had a free warranty cat replacement where the new cat had a notch at
the end of the pipe that lined up perfectly with a similar one at the
back end of the exhisting pipe from the manifold. Made a very similar
sound until fixed.

Will Honea proclaimed:
> That does sound like mine when the CPS was shorting against the
> manifold. As for the noise, since they worked on the exhaust I would
> first check for either a loose downpipe or a cracked ehaust manifold.
> Thye may have played Tarzan on the pipes while fitting the new cat -
> of just not gotten it seated right.
>
> On Mon, 16 Jan 2006 00:33:28 UTC L.W.(ßill) ------ III
> <----------@***.net> wrote:
>
>
>> The limp mode should default to the initial timing so it would be
>>impossible to spark knock.
>> God Bless America, Bill O|||||||O
>>mailto:-------------------- http://www.----------.com/
>>
>>DougW wrote:
>>
>>>That's what I'm thinking.
>>>
>>>I'm also thinking the ECU hasn't adjusted back from where it was
>>>and the OP should take the battery off for about half an hour and
>>>then let it re-learn.
>
>
>

 

My 2.5L TJ sounds exactly like the .mp3s.
Exhaust leak - no doubt about it.

bllsht wrote:
> It's an exhaust leak.

 

My 2.5L TJ sounds exactly like the .mp3s.
Exhaust leak - no doubt about it.

bllsht wrote:
> It's an exhaust leak.

 

My 2.5L TJ sounds exactly like the .mp3s.
Exhaust leak - no doubt about it.

bllsht wrote:
> It's an exhaust leak.

 

those 2.5's are well known for the rear exhaust manifold bolts breaking off flush
in the head
i can even begin to count how many i have done

Mike Romain wrote:

> Well, if they are anything like the incompetent butchers that changed
> our Cherokee's exhaust, you sure could now have a cracked manifold.
>
> 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)
>
> Keith Orbell wrote:
> >
> > I posted a couple of weeks ago concerning a problem with my 97 TJ (4cyl,
> > auto, 130K) and a lack of power at freeway speeds. I got some good
> > suggestions on here, the general consensus being that it could be a plugged
> > catalytic converter.
> >
> > After that post, the problem apparently went away - until this past Friday
> > when the car lost almost all power, but I was able to limp it home using
> > very light throttle openings to (eventually) reach about 25/30 mph.
> >
> > Yesterday, I got it to the shop to have a new cat fitted. This has restored
> > the power but now another (somewhat more serious sounding) problem is
> > evident:
> >
> > I now have a ticking or tapping sound which gets faster with increased
> > engine speed and louder under wider throttle openings. At idle or when
> > cruising or when revving the engine gently at a standstill, you can't hear
> > the noise. But when any load is applied to the engine, the noise is
> > apparent.
> >
> > I made a couple of mp3s to document the sound. The first is the vehicle
> > standing - you can hear the noise when I applied rapid throttle (0:01, 0:13,
> > 0:19), but not when applying gentle throttle (0:03, 0:22) to reach the same
> > engine speeds:
> >
> > http://www.aooa27.dsl.pipex.com/jeep0.mp3
> >
> > The second is a short cruise around the block. You can pretty much hear it
> > at any time I accelerated:
> >
> > http://www.aooa27.dsl.pipex.com/jeep1.mp3
> >
> > I presume that in limping the vehicle home and to the shop, I broke
> > something. Under the hood, it sounds like it's coming from the top end of
> > the engine - but I don't have a stethoscope or anything to be able to say
> > for sure.
> >
> > Any ideas here on what this could be ?
> >
> > Thanks in advance for any help
> > Keith

 

those 2.5's are well known for the rear exhaust manifold bolts breaking off flush
in the head
i can even begin to count how many i have done

Mike Romain wrote:

> Well, if they are anything like the incompetent butchers that changed
> our Cherokee's exhaust, you sure could now have a cracked manifold.
>
> 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)
>
> Keith Orbell wrote:
> >
> > I posted a couple of weeks ago concerning a problem with my 97 TJ (4cyl,
> > auto, 130K) and a lack of power at freeway speeds. I got some good
> > suggestions on here, the general consensus being that it could be a plugged
> > catalytic converter.
> >
> > After that post, the problem apparently went away - until this past Friday
> > when the car lost almost all power, but I was able to limp it home using
> > very light throttle openings to (eventually) reach about 25/30 mph.
> >
> > Yesterday, I got it to the shop to have a new cat fitted. This has restored
> > the power but now another (somewhat more serious sounding) problem is
> > evident:
> >
> > I now have a ticking or tapping sound which gets faster with increased
> > engine speed and louder under wider throttle openings. At idle or when
> > cruising or when revving the engine gently at a standstill, you can't hear
> > the noise. But when any load is applied to the engine, the noise is
> > apparent.
> >
> > I made a couple of mp3s to document the sound. The first is the vehicle
> > standing - you can hear the noise when I applied rapid throttle (0:01, 0:13,
> > 0:19), but not when applying gentle throttle (0:03, 0:22) to reach the same
> > engine speeds:
> >
> > http://www.aooa27.dsl.pipex.com/jeep0.mp3
> >
> > The second is a short cruise around the block. You can pretty much hear it
> > at any time I accelerated:
> >
> > http://www.aooa27.dsl.pipex.com/jeep1.mp3
> >
> > I presume that in limping the vehicle home and to the shop, I broke
> > something. Under the hood, it sounds like it's coming from the top end of
> > the engine - but I don't have a stethoscope or anything to be able to say
> > for sure.
> >
> > Any ideas here on what this could be ?
> >
> > Thanks in advance for any help
> > Keith

 

those 2.5's are well known for the rear exhaust manifold bolts breaking off flush
in the head
i can even begin to count how many i have done

Mike Romain wrote:

> Well, if they are anything like the incompetent butchers that changed
> our Cherokee's exhaust, you sure could now have a cracked manifold.
>
> 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)
>
> Keith Orbell wrote:
> >
> > I posted a couple of weeks ago concerning a problem with my 97 TJ (4cyl,
> > auto, 130K) and a lack of power at freeway speeds. I got some good
> > suggestions on here, the general consensus being that it could be a plugged
> > catalytic converter.
> >
> > After that post, the problem apparently went away - until this past Friday
> > when the car lost almost all power, but I was able to limp it home using
> > very light throttle openings to (eventually) reach about 25/30 mph.
> >
> > Yesterday, I got it to the shop to have a new cat fitted. This has restored
> > the power but now another (somewhat more serious sounding) problem is
> > evident:
> >
> > I now have a ticking or tapping sound which gets faster with increased
> > engine speed and louder under wider throttle openings. At idle or when
> > cruising or when revving the engine gently at a standstill, you can't hear
> > the noise. But when any load is applied to the engine, the noise is
> > apparent.
> >
> > I made a couple of mp3s to document the sound. The first is the vehicle
> > standing - you can hear the noise when I applied rapid throttle (0:01, 0:13,
> > 0:19), but not when applying gentle throttle (0:03, 0:22) to reach the same
> > engine speeds:
> >
> > http://www.aooa27.dsl.pipex.com/jeep0.mp3
> >
> > The second is a short cruise around the block. You can pretty much hear it
> > at any time I accelerated:
> >
> > http://www.aooa27.dsl.pipex.com/jeep1.mp3
> >
> > I presume that in limping the vehicle home and to the shop, I broke
> > something. Under the hood, it sounds like it's coming from the top end of
> > the engine - but I don't have a stethoscope or anything to be able to say
> > for sure.
> >
> > Any ideas here on what this could be ?
> >
> > Thanks in advance for any help
> > Keith

 

To follow up on this, I had it looked at in the week.

There were two problems - a bad manifold gasket and a cracked manifold.

Thanks for all the replies and good suggestions.
Keith


"Lon" <lon.stowell@comcast.net> wrote in message
news:FqCdndK6bbCGdFfenZ2dnUVZ_tKdnZ2d@comcast.com. ..
> Was that there before the exhaust work? It sounds rather like a cracked
> manifold or just a crappy install of the catalyst letting exhaust leak.

 

To follow up on this, I had it looked at in the week.

There were two problems - a bad manifold gasket and a cracked manifold.

Thanks for all the replies and good suggestions.
Keith


"Lon" <lon.stowell@comcast.net> wrote in message
news:FqCdndK6bbCGdFfenZ2dnUVZ_tKdnZ2d@comcast.com. ..
> Was that there before the exhaust work? It sounds rather like a cracked
> manifold or just a crappy install of the catalyst letting exhaust leak.

 

To follow up on this, I had it looked at in the week.

There were two problems - a bad manifold gasket and a cracked manifold.

Thanks for all the replies and good suggestions.
Keith


"Lon" <lon.stowell@comcast.net> wrote in message
news:FqCdndK6bbCGdFfenZ2dnUVZ_tKdnZ2d@comcast.com. ..
> Was that there before the exhaust work? It sounds rather like a cracked
> manifold or just a crappy install of the catalyst letting exhaust leak.