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.

Keith Orbell proclaimed:

> 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
>
>

 

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.

Keith Orbell proclaimed:

> 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
>
>

 

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.

Keith Orbell proclaimed:

> 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
>
>

 

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.

 

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.

 

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.

 

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.


--
Will Honea

 

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.


--
Will Honea

 

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.


--
Will Honea

 

Buy a stethoscope. Even the fancy Littmann medical scope that I have, with
my initials engraved on the probe, was less than a hundred bucks. The cheap
ones are a lot less, and function almost as well.

Earle

"Keith Orbell" <quite98@hotmail.com> wrote in message
news:JIWdnc9cjLaMTlfenZ2dnUVZ_tmdnZ2d@wideopenwest .com...
> 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
>
>