Firebird

I brought it to the dealer, there was no problem with a plug or wire.
The engine runs smoothly, there is no missing.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4448181E.E59C1E66@sympatico.ca...
>I think I would be first looking at the distributor cap under a strong
> light for a small white spider web looking mark around the post for that
> cylinder.
>
> I next would take an ohm meter and check the plug wire. I would compare
> it to the ohms for #2 or #6 depending on the engine. I believe one of
> those wires are the same length as #1, so they should read the 'same'.
> It is measured in "X" ohms per foot, so a 2' wire measures double the
> "X" of a 1' wire.
>
> I next would spend 2 or 3 bucks and change the damn spark plug, then
> pull the battery cables to reset the computer. When I did that, I would
> pull another plug to see if #1 looks fouled or really clean in
> comparison. (electric misfire vs coolant/compression leak)
>
> 'Then' if all else failed I would get a ten dollar compression tester
> and check the compression to compare all to #1.
>
> Then I might change the head gasket....
>
> 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)
>
> Firebird wrote:
>>
>> I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
>> and
>> the code being displayed is P0301, which is misfire in cylinder 1. I
>> finally
>> brought it to the Jeep dealer, they could not find any issues with the
>> plugs, wires etc..
>> So, they reprogrammed the computer, and told me if the lite comes on
>> again
>> then the cylinder head would require removal and possible replacement
>> would
>> be required...
>>
>> The car runs fine...except for the dumb light. DOes anyone experience
>> this
>> same issue also.
>> Thanks

Firebird

I brought it to the dealer, there was no problem with a plug or wire.
The engine runs smoothly, there is no missing.


"Mike Romain" <romainm@sympatico.ca> wrote in message
news:4448181E.E59C1E66@sympatico.ca...
>I think I would be first looking at the distributor cap under a strong
> light for a small white spider web looking mark around the post for that
> cylinder.
>
> I next would take an ohm meter and check the plug wire. I would compare
> it to the ohms for #2 or #6 depending on the engine. I believe one of
> those wires are the same length as #1, so they should read the 'same'.
> It is measured in "X" ohms per foot, so a 2' wire measures double the
> "X" of a 1' wire.
>
> I next would spend 2 or 3 bucks and change the damn spark plug, then
> pull the battery cables to reset the computer. When I did that, I would
> pull another plug to see if #1 looks fouled or really clean in
> comparison. (electric misfire vs coolant/compression leak)
>
> 'Then' if all else failed I would get a ten dollar compression tester
> and check the compression to compare all to #1.
>
> Then I might change the head gasket....
>
> 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)
>
> Firebird wrote:
>>
>> I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
>> and
>> the code being displayed is P0301, which is misfire in cylinder 1. I
>> finally
>> brought it to the Jeep dealer, they could not find any issues with the
>> plugs, wires etc..
>> So, they reprogrammed the computer, and told me if the lite comes on
>> again
>> then the cylinder head would require removal and possible replacement
>> would
>> be required...
>>
>> The car runs fine...except for the dumb light. DOes anyone experience
>> this
>> same issue also.
>> Thanks

Firebird

The I-6.
"Herb Leong" <herb@urusei.net> wrote in message
news:O9GdnS_7vJOLwNXZnZ2dnUVZ_smdnZ2d@speakeasy.ne t...
> In article <1mU1g.24184$nA3.1460@news-wrt-01.rdc-nyc.rr.com>,
> Firebird <erodman@nyc.rr.com> wrote:
> #I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
> and
> #the code being displayed is P0301, which is misfire in cylinder 1. I
> finally
> #brought it to the Jeep dealer, they could not find any issues with the
> #plugs, wires etc..
> What engine do you have? The i6, the v8, or the High Output v8?
>
> /herb
>

Firebird

The I-6.
"Herb Leong" <herb@urusei.net> wrote in message
news:O9GdnS_7vJOLwNXZnZ2dnUVZ_smdnZ2d@speakeasy.ne t...
> In article <1mU1g.24184$nA3.1460@news-wrt-01.rdc-nyc.rr.com>,
> Firebird <erodman@nyc.rr.com> wrote:
> #I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
> and
> #the code being displayed is P0301, which is misfire in cylinder 1. I
> finally
> #brought it to the Jeep dealer, they could not find any issues with the
> #plugs, wires etc..
> What engine do you have? The i6, the v8, or the High Output v8?
>
> /herb
>

Firebird

The I-6.
"Herb Leong" <herb@urusei.net> wrote in message
news:O9GdnS_7vJOLwNXZnZ2dnUVZ_smdnZ2d@speakeasy.ne t...
> In article <1mU1g.24184$nA3.1460@news-wrt-01.rdc-nyc.rr.com>,
> Firebird <erodman@nyc.rr.com> wrote:
> #I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
> and
> #the code being displayed is P0301, which is misfire in cylinder 1. I
> finally
> #brought it to the Jeep dealer, they could not find any issues with the
> #plugs, wires etc..
> What engine do you have? The i6, the v8, or the High Output v8?
>
> /herb
>

Firebird

It is a I-6.
I had it at the dealer, they found no problem with the plugs.
The engine runs smoothly, it does not misfire or shake or anything like
that,
the code just came on...One thing however, I had been using Premium unleaded
gas for about 3 weeks.
Thats the only thing that was different.


"billy ray" <billy_ray@SPAMfuse.net> wrote in message
news:93bad$444843f5$48311525$18862@FUSE.NET...
> Is it a I-6 or the V-8?
>
> The '01s have no distributor cap or wires. They do have coil packs (I-6)
> or coil on wire (V-8)
>
> On an I-6 a coil problem would show up on cylinders 1 & 6 as that same
> coil pack fires both.
>
> A close examination of the sparkplug may reveal if a plug is oil fouled,
> contaminated by coolant, or damaged. If the misfire occurs only
> occasionally (but enough to set off the code) it may appear 'normal'
>
> If the plugs are more than a year old go ahead and change them all, if
> less you might try just one plug in cylinder #1
>
> I personally prefer the Bosch Platinum plugs but if you have a preference
> for copper then I would suggest Bosch Supers.
>
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:51V1g.19591$IZ2.489@dukeread07...
>> Mike Romain did pass the time by typing:
>>> I think I would be first looking at the distributor cap under a strong
>>> light for a small white spider web looking mark around the post for that
>>> cylinder.
>>
>> <snippies>
>>
>> Also if that's a coil on plug setup, 1 and 3 fire at the same time.
>> A leaky injector on #1 (or a fowled plug) can cause a misfire.
>>
>> I'd take a look at the plug first.
>>
>>> Firebird wrote:
>>>>
>>>> I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
>>>> and
>>>> the code being displayed is P0301, which is misfire in cylinder 1. I
>>>> finally
>>>> brought it to the Jeep dealer, they could not find any issues with the
>>>> plugs, wires etc..
>>
>> --
>> DougW
>>
>>
>
>

Firebird

It is a I-6.
I had it at the dealer, they found no problem with the plugs.
The engine runs smoothly, it does not misfire or shake or anything like
that,
the code just came on...One thing however, I had been using Premium unleaded
gas for about 3 weeks.
Thats the only thing that was different.


"billy ray" <billy_ray@SPAMfuse.net> wrote in message
news:93bad$444843f5$48311525$18862@FUSE.NET...
> Is it a I-6 or the V-8?
>
> The '01s have no distributor cap or wires. They do have coil packs (I-6)
> or coil on wire (V-8)
>
> On an I-6 a coil problem would show up on cylinders 1 & 6 as that same
> coil pack fires both.
>
> A close examination of the sparkplug may reveal if a plug is oil fouled,
> contaminated by coolant, or damaged. If the misfire occurs only
> occasionally (but enough to set off the code) it may appear 'normal'
>
> If the plugs are more than a year old go ahead and change them all, if
> less you might try just one plug in cylinder #1
>
> I personally prefer the Bosch Platinum plugs but if you have a preference
> for copper then I would suggest Bosch Supers.
>
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:51V1g.19591$IZ2.489@dukeread07...
>> Mike Romain did pass the time by typing:
>>> I think I would be first looking at the distributor cap under a strong
>>> light for a small white spider web looking mark around the post for that
>>> cylinder.
>>
>> <snippies>
>>
>> Also if that's a coil on plug setup, 1 and 3 fire at the same time.
>> A leaky injector on #1 (or a fowled plug) can cause a misfire.
>>
>> I'd take a look at the plug first.
>>
>>> Firebird wrote:
>>>>
>>>> I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
>>>> and
>>>> the code being displayed is P0301, which is misfire in cylinder 1. I
>>>> finally
>>>> brought it to the Jeep dealer, they could not find any issues with the
>>>> plugs, wires etc..
>>
>> --
>> DougW
>>
>>
>
>

Firebird

It is a I-6.
I had it at the dealer, they found no problem with the plugs.
The engine runs smoothly, it does not misfire or shake or anything like
that,
the code just came on...One thing however, I had been using Premium unleaded
gas for about 3 weeks.
Thats the only thing that was different.


"billy ray" <billy_ray@SPAMfuse.net> wrote in message
news:93bad$444843f5$48311525$18862@FUSE.NET...
> Is it a I-6 or the V-8?
>
> The '01s have no distributor cap or wires. They do have coil packs (I-6)
> or coil on wire (V-8)
>
> On an I-6 a coil problem would show up on cylinders 1 & 6 as that same
> coil pack fires both.
>
> A close examination of the sparkplug may reveal if a plug is oil fouled,
> contaminated by coolant, or damaged. If the misfire occurs only
> occasionally (but enough to set off the code) it may appear 'normal'
>
> If the plugs are more than a year old go ahead and change them all, if
> less you might try just one plug in cylinder #1
>
> I personally prefer the Bosch Platinum plugs but if you have a preference
> for copper then I would suggest Bosch Supers.
>
>
> "DougW" <post.replies@invalid.address> wrote in message
> news:51V1g.19591$IZ2.489@dukeread07...
>> Mike Romain did pass the time by typing:
>>> I think I would be first looking at the distributor cap under a strong
>>> light for a small white spider web looking mark around the post for that
>>> cylinder.
>>
>> <snippies>
>>
>> Also if that's a coil on plug setup, 1 and 3 fire at the same time.
>> A leaky injector on #1 (or a fowled plug) can cause a misfire.
>>
>> I'd take a look at the plug first.
>>
>>> Firebird wrote:
>>>>
>>>> I have a 2001 Jeep Grand Cherokee Laredo. My check engine light was on
>>>> and
>>>> the code being displayed is P0301, which is misfire in cylinder 1. I
>>>> finally
>>>> brought it to the Jeep dealer, they could not find any issues with the
>>>> plugs, wires etc..
>>
>> --
>> DougW
>>
>>
>
>

Herb Leong

In article <NY12g.33062$cY3.106@news-wrt-01.rdc-nyc.rr.com>,
Firebird <erodman@nyc.rr.com> wrote:
#The I-6.

As someone said earlier, the I-6 fires two chambers at the same
time so it could be either 1 or 6.

It could have been a slightly loose wire, or the the coil pack
might be headded south.

How old are the spark plugs? While they are probably still good,
it can't hurt to re-gap or replace them if the maint schedule says
to do so. http://www.wjjeeps.com/service/sparkplugs.htm

/herb

Herb Leong

In article <NY12g.33062$cY3.106@news-wrt-01.rdc-nyc.rr.com>,
Firebird <erodman@nyc.rr.com> wrote:
#The I-6.

As someone said earlier, the I-6 fires two chambers at the same
time so it could be either 1 or 6.

It could have been a slightly loose wire, or the the coil pack
might be headded south.

How old are the spark plugs? While they are probably still good,
it can't hurt to re-gap or replace them if the maint schedule says
to do so. http://www.wjjeeps.com/service/sparkplugs.htm

/herb