I just talked to the dealer who said the heat shield had been put on
the intake to prevent overheating injector #3. I guess it rules that
one out. I'll try looking at the injector this weekend. I'll wait on
checking the coil since it would most likely affect 2 cylinders,
although I'll keep it in the back of my head to not rule it out
completely.

Thanks everyone.

On Jan 9, 10:07 pm, "Carl" <carlsai...@hotmailREMOVE.com> wrote:
> Les,
>
> Thanks for the follow up.
>
> Carl
>
> "Les" <wiedr...@twcny.rr.com> wrote in messagenews:45a45c4e$0$8920$4c368faf@roadrunner.co m...
>
> > Hi all, here is an update on my 2001 TJ from a previous reply in this
> > thread. After replacing the broken bridge and reassembling the rocker, a
> > test drive showed some improvement but the Jeep threw the P0302 engine
> > code again. After several days of digging into possibilities and a few
> > calls to Chrysler, the guys finally dug out the problem. The cam had a bad
> > lobe on one of the number two valves. I now have a pretty much rebuilt top
> > end, new lifters, cam, rockers, timing chain and gears, etc.. They showed
> > me the old cam and, while the Chrysler tech wouldn't admit a bad heat
> > treat to begin with, he did say that he has seen a "few" but they are not
> > common to have go bad. The TJ came home today, runs great, nice and
> > quiet, smooth at idle and driving speeds. I'm just over $700 lighter in
> > the wallet but I should be able to run this engine til I decide I need a
> > newer Jeep. Just wanted to let the group know the update on my problem
> > about my misfire.
> > Les
>
> > "01XJ" <adam.tsacouman...@gmail.com> wrote in message
> >news:1167779855.090317.153570@v33g2000cwv.googleg roups.com...
> >>I just started experiencing a rough idle on my 2001 Cherokee (78k
> >> miles). My engine light went on a little after that with the P0303
> >> code. I just replaced the spark plugs, but that didn't help anything.
> >> I was
> >> thinking about changing the ignition coil or fuel injector. One other
> >> possibility I was
> >> thinking was checking the cylinder compression (maybe a gasket leak?).
> >> Anyone have any suggestions?

 

I just talked to the dealer who said the heat shield had been put on
the intake to prevent overheating injector #3. I guess it rules that
one out. I'll try looking at the injector this weekend. I'll wait on
checking the coil since it would most likely affect 2 cylinders,
although I'll keep it in the back of my head to not rule it out
completely.

Thanks everyone.

On Jan 9, 10:07 pm, "Carl" <carlsai...@hotmailREMOVE.com> wrote:
> Les,
>
> Thanks for the follow up.
>
> Carl
>
> "Les" <wiedr...@twcny.rr.com> wrote in messagenews:45a45c4e$0$8920$4c368faf@roadrunner.co m...
>
> > Hi all, here is an update on my 2001 TJ from a previous reply in this
> > thread. After replacing the broken bridge and reassembling the rocker, a
> > test drive showed some improvement but the Jeep threw the P0302 engine
> > code again. After several days of digging into possibilities and a few
> > calls to Chrysler, the guys finally dug out the problem. The cam had a bad
> > lobe on one of the number two valves. I now have a pretty much rebuilt top
> > end, new lifters, cam, rockers, timing chain and gears, etc.. They showed
> > me the old cam and, while the Chrysler tech wouldn't admit a bad heat
> > treat to begin with, he did say that he has seen a "few" but they are not
> > common to have go bad. The TJ came home today, runs great, nice and
> > quiet, smooth at idle and driving speeds. I'm just over $700 lighter in
> > the wallet but I should be able to run this engine til I decide I need a
> > newer Jeep. Just wanted to let the group know the update on my problem
> > about my misfire.
> > Les
>
> > "01XJ" <adam.tsacouman...@gmail.com> wrote in message
> >news:1167779855.090317.153570@v33g2000cwv.googleg roups.com...
> >>I just started experiencing a rough idle on my 2001 Cherokee (78k
> >> miles). My engine light went on a little after that with the P0303
> >> code. I just replaced the spark plugs, but that didn't help anything.
> >> I was
> >> thinking about changing the ignition coil or fuel injector. One other
> >> possibility I was
> >> thinking was checking the cylinder compression (maybe a gasket leak?).
> >> Anyone have any suggestions?

 

I just talked to the dealer who said the heat shield had been put on
the intake to prevent overheating injector #3. I guess it rules that
one out. I'll try looking at the injector this weekend. I'll wait on
checking the coil since it would most likely affect 2 cylinders,
although I'll keep it in the back of my head to not rule it out
completely.

Thanks everyone.

On Jan 9, 10:07 pm, "Carl" <carlsai...@hotmailREMOVE.com> wrote:
> Les,
>
> Thanks for the follow up.
>
> Carl
>
> "Les" <wiedr...@twcny.rr.com> wrote in messagenews:45a45c4e$0$8920$4c368faf@roadrunner.co m...
>
> > Hi all, here is an update on my 2001 TJ from a previous reply in this
> > thread. After replacing the broken bridge and reassembling the rocker, a
> > test drive showed some improvement but the Jeep threw the P0302 engine
> > code again. After several days of digging into possibilities and a few
> > calls to Chrysler, the guys finally dug out the problem. The cam had a bad
> > lobe on one of the number two valves. I now have a pretty much rebuilt top
> > end, new lifters, cam, rockers, timing chain and gears, etc.. They showed
> > me the old cam and, while the Chrysler tech wouldn't admit a bad heat
> > treat to begin with, he did say that he has seen a "few" but they are not
> > common to have go bad. The TJ came home today, runs great, nice and
> > quiet, smooth at idle and driving speeds. I'm just over $700 lighter in
> > the wallet but I should be able to run this engine til I decide I need a
> > newer Jeep. Just wanted to let the group know the update on my problem
> > about my misfire.
> > Les
>
> > "01XJ" <adam.tsacouman...@gmail.com> wrote in message
> >news:1167779855.090317.153570@v33g2000cwv.googleg roups.com...
> >>I just started experiencing a rough idle on my 2001 Cherokee (78k
> >> miles). My engine light went on a little after that with the P0303
> >> code. I just replaced the spark plugs, but that didn't help anything.
> >> I was
> >> thinking about changing the ignition coil or fuel injector. One other
> >> possibility I was
> >> thinking was checking the cylinder compression (maybe a gasket leak?).
> >> Anyone have any suggestions?