That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
plugs.

"tim bur" <dbrider@cac.net> wrote in message
news:43249F9E.6F32B587@cac.net...
> not on that coil pac
>
> Billy Ray wrote:
>
>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
>>
>> --
>> .
>> Billy_Ray@SPAM.fuse.net (remove SPAM)
>> 2002 Jeep WJ 4 Liter Automatic
>> Brilliant Black Crystal Pearl Coat
>> Sharing is why we are all here....... or should be.
>> .
>> "tim bur" <dbrider@cac.net> wrote in message
>> news:43236F02.32C2328F@cac.net...
>> > fouled spark plug, failed injector, and a failed coil pac ,
>> >
>> > ken859@optonline.net wrote:
>> >
>> >> 2004 Jeep Grand Cherokee Limited
>> >> Inline 6 Cylinder Engine
>> >> Automatic Transmission
>> >> Stock - No modifications
>> >>
>> >> Symptoms:
>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
>> >> and the car starts shaking rapidly. When you accelerate the car
>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
>> >> pressing the accelerator slightly to maintain a steady velocity (which
>> >> is about 1500RPM) the car will experience the shake while driving.
>> >> Moderate acceleration the problem goes away. Lifting off of the gas
>> >> and the problem goes away until the above rpm range is reached and
>> >> then problem comes back
>> >>
>> >> Followup:
>> >> Computer diagnostics indicates a miss fire on cylinder # 5
>> >>
>> >> Question:
>> >> Could this be a clogged injector or are there other suggestions?
>> >>
>> >> TIA Ken
>> >
>

 

Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.

In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:

>That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
>plugs.
>
>"tim bur" <dbrider@cac.net> wrote in message
>news:43249F9E.6F32B587@cac.net...
>> not on that coil pac
>>
>> Billy Ray wrote:
>>
>>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
>>>
>>> --
>>> .
>>> Billy_Ray@SPAM.fuse.net (remove SPAM)
>>> 2002 Jeep WJ 4 Liter Automatic
>>> Brilliant Black Crystal Pearl Coat
>>> Sharing is why we are all here....... or should be.
>>> .
>>> "tim bur" <dbrider@cac.net> wrote in message
>>> news:43236F02.32C2328F@cac.net...
>>> > fouled spark plug, failed injector, and a failed coil pac ,
>>> >
>>> > ken859@optonline.net wrote:
>>> >
>>> >> 2004 Jeep Grand Cherokee Limited
>>> >> Inline 6 Cylinder Engine
>>> >> Automatic Transmission
>>> >> Stock - No modifications
>>> >>
>>> >> Symptoms:
>>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
>>> >> and the car starts shaking rapidly. When you accelerate the car
>>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
>>> >> pressing the accelerator slightly to maintain a steady velocity (which
>>> >> is about 1500RPM) the car will experience the shake while driving.
>>> >> Moderate acceleration the problem goes away. Lifting off of the gas
>>> >> and the problem goes away until the above rpm range is reached and
>>> >> then problem comes back
>>> >>
>>> >> Followup:
>>> >> Computer diagnostics indicates a miss fire on cylinder # 5
>>> >>
>>> >> Question:
>>> >> Could this be a clogged injector or are there other suggestions?
>>> >>
>>> >> TIA Ken
>>> >
>>
>

 

Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.

In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:

>That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
>plugs.
>
>"tim bur" <dbrider@cac.net> wrote in message
>news:43249F9E.6F32B587@cac.net...
>> not on that coil pac
>>
>> Billy Ray wrote:
>>
>>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
>>>
>>> --
>>> .
>>> Billy_Ray@SPAM.fuse.net (remove SPAM)
>>> 2002 Jeep WJ 4 Liter Automatic
>>> Brilliant Black Crystal Pearl Coat
>>> Sharing is why we are all here....... or should be.
>>> .
>>> "tim bur" <dbrider@cac.net> wrote in message
>>> news:43236F02.32C2328F@cac.net...
>>> > fouled spark plug, failed injector, and a failed coil pac ,
>>> >
>>> > ken859@optonline.net wrote:
>>> >
>>> >> 2004 Jeep Grand Cherokee Limited
>>> >> Inline 6 Cylinder Engine
>>> >> Automatic Transmission
>>> >> Stock - No modifications
>>> >>
>>> >> Symptoms:
>>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
>>> >> and the car starts shaking rapidly. When you accelerate the car
>>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
>>> >> pressing the accelerator slightly to maintain a steady velocity (which
>>> >> is about 1500RPM) the car will experience the shake while driving.
>>> >> Moderate acceleration the problem goes away. Lifting off of the gas
>>> >> and the problem goes away until the above rpm range is reached and
>>> >> then problem comes back
>>> >>
>>> >> Followup:
>>> >> Computer diagnostics indicates a miss fire on cylinder # 5
>>> >>
>>> >> Question:
>>> >> Could this be a clogged injector or are there other suggestions?
>>> >>
>>> >> TIA Ken
>>> >
>>
>

 

Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.

In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:

>That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
>plugs.
>
>"tim bur" <dbrider@cac.net> wrote in message
>news:43249F9E.6F32B587@cac.net...
>> not on that coil pac
>>
>> Billy Ray wrote:
>>
>>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
>>>
>>> --
>>> .
>>> Billy_Ray@SPAM.fuse.net (remove SPAM)
>>> 2002 Jeep WJ 4 Liter Automatic
>>> Brilliant Black Crystal Pearl Coat
>>> Sharing is why we are all here....... or should be.
>>> .
>>> "tim bur" <dbrider@cac.net> wrote in message
>>> news:43236F02.32C2328F@cac.net...
>>> > fouled spark plug, failed injector, and a failed coil pac ,
>>> >
>>> > ken859@optonline.net wrote:
>>> >
>>> >> 2004 Jeep Grand Cherokee Limited
>>> >> Inline 6 Cylinder Engine
>>> >> Automatic Transmission
>>> >> Stock - No modifications
>>> >>
>>> >> Symptoms:
>>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
>>> >> and the car starts shaking rapidly. When you accelerate the car
>>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
>>> >> pressing the accelerator slightly to maintain a steady velocity (which
>>> >> is about 1500RPM) the car will experience the shake while driving.
>>> >> Moderate acceleration the problem goes away. Lifting off of the gas
>>> >> and the problem goes away until the above rpm range is reached and
>>> >> then problem comes back
>>> >>
>>> >> Followup:
>>> >> Computer diagnostics indicates a miss fire on cylinder # 5
>>> >>
>>> >> Question:
>>> >> Could this be a clogged injector or are there other suggestions?
>>> >>
>>> >> TIA Ken
>>> >
>>
>

 

Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.

In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:

>That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
>plugs.
>
>"tim bur" <dbrider@cac.net> wrote in message
>news:43249F9E.6F32B587@cac.net...
>> not on that coil pac
>>
>> Billy Ray wrote:
>>
>>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
>>>
>>> --
>>> .
>>> Billy_Ray@SPAM.fuse.net (remove SPAM)
>>> 2002 Jeep WJ 4 Liter Automatic
>>> Brilliant Black Crystal Pearl Coat
>>> Sharing is why we are all here....... or should be.
>>> .
>>> "tim bur" <dbrider@cac.net> wrote in message
>>> news:43236F02.32C2328F@cac.net...
>>> > fouled spark plug, failed injector, and a failed coil pac ,
>>> >
>>> > ken859@optonline.net wrote:
>>> >
>>> >> 2004 Jeep Grand Cherokee Limited
>>> >> Inline 6 Cylinder Engine
>>> >> Automatic Transmission
>>> >> Stock - No modifications
>>> >>
>>> >> Symptoms:
>>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
>>> >> and the car starts shaking rapidly. When you accelerate the car
>>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
>>> >> pressing the accelerator slightly to maintain a steady velocity (which
>>> >> is about 1500RPM) the car will experience the shake while driving.
>>> >> Moderate acceleration the problem goes away. Lifting off of the gas
>>> >> and the problem goes away until the above rpm range is reached and
>>> >> then problem comes back
>>> >>
>>> >> Followup:
>>> >> Computer diagnostics indicates a miss fire on cylinder # 5
>>> >>
>>> >> Question:
>>> >> Could this be a clogged injector or are there other suggestions?
>>> >>
>>> >> TIA Ken
>>> >
>>
>

 

the reason i did not type that in was because it fires a cylinder in the exchaust
stroke and he's trying too figure out a misfire in this case it's not needed
info

bllsht wrote:

> Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.
>
> In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:
>
> >That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
> >plugs.
> >
> >"tim bur" <dbrider@cac.net> wrote in message
> >news:43249F9E.6F32B587@cac.net...
> >> not on that coil pac
> >>
> >> Billy Ray wrote:
> >>
> >>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
> >>>
> >>> --
> >>> .
> >>> Billy_Ray@SPAM.fuse.net (remove SPAM)
> >>> 2002 Jeep WJ 4 Liter Automatic
> >>> Brilliant Black Crystal Pearl Coat
> >>> Sharing is why we are all here....... or should be.
> >>> .
> >>> "tim bur" <dbrider@cac.net> wrote in message
> >>> news:43236F02.32C2328F@cac.net...
> >>> > fouled spark plug, failed injector, and a failed coil pac ,
> >>> >
> >>> > ken859@optonline.net wrote:
> >>> >
> >>> >> 2004 Jeep Grand Cherokee Limited
> >>> >> Inline 6 Cylinder Engine
> >>> >> Automatic Transmission
> >>> >> Stock - No modifications
> >>> >>
> >>> >> Symptoms:
> >>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
> >>> >> and the car starts shaking rapidly. When you accelerate the car
> >>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
> >>> >> pressing the accelerator slightly to maintain a steady velocity (which
> >>> >> is about 1500RPM) the car will experience the shake while driving.
> >>> >> Moderate acceleration the problem goes away. Lifting off of the gas
> >>> >> and the problem goes away until the above rpm range is reached and
> >>> >> then problem comes back
> >>> >>
> >>> >> Followup:
> >>> >> Computer diagnostics indicates a miss fire on cylinder # 5
> >>> >>
> >>> >> Question:
> >>> >> Could this be a clogged injector or are there other suggestions?
> >>> >>
> >>> >> TIA Ken
> >>> >
> >>
> >

 

the reason i did not type that in was because it fires a cylinder in the exchaust
stroke and he's trying too figure out a misfire in this case it's not needed
info

bllsht wrote:

> Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.
>
> In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:
>
> >That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
> >plugs.
> >
> >"tim bur" <dbrider@cac.net> wrote in message
> >news:43249F9E.6F32B587@cac.net...
> >> not on that coil pac
> >>
> >> Billy Ray wrote:
> >>
> >>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
> >>>
> >>> --
> >>> .
> >>> Billy_Ray@SPAM.fuse.net (remove SPAM)
> >>> 2002 Jeep WJ 4 Liter Automatic
> >>> Brilliant Black Crystal Pearl Coat
> >>> Sharing is why we are all here....... or should be.
> >>> .
> >>> "tim bur" <dbrider@cac.net> wrote in message
> >>> news:43236F02.32C2328F@cac.net...
> >>> > fouled spark plug, failed injector, and a failed coil pac ,
> >>> >
> >>> > ken859@optonline.net wrote:
> >>> >
> >>> >> 2004 Jeep Grand Cherokee Limited
> >>> >> Inline 6 Cylinder Engine
> >>> >> Automatic Transmission
> >>> >> Stock - No modifications
> >>> >>
> >>> >> Symptoms:
> >>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
> >>> >> and the car starts shaking rapidly. When you accelerate the car
> >>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
> >>> >> pressing the accelerator slightly to maintain a steady velocity (which
> >>> >> is about 1500RPM) the car will experience the shake while driving.
> >>> >> Moderate acceleration the problem goes away. Lifting off of the gas
> >>> >> and the problem goes away until the above rpm range is reached and
> >>> >> then problem comes back
> >>> >>
> >>> >> Followup:
> >>> >> Computer diagnostics indicates a miss fire on cylinder # 5
> >>> >>
> >>> >> Question:
> >>> >> Could this be a clogged injector or are there other suggestions?
> >>> >>
> >>> >> TIA Ken
> >>> >
> >>
> >

 

the reason i did not type that in was because it fires a cylinder in the exchaust
stroke and he's trying too figure out a misfire in this case it's not needed
info

bllsht wrote:

> Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.
>
> In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:
>
> >That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
> >plugs.
> >
> >"tim bur" <dbrider@cac.net> wrote in message
> >news:43249F9E.6F32B587@cac.net...
> >> not on that coil pac
> >>
> >> Billy Ray wrote:
> >>
> >>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
> >>>
> >>> --
> >>> .
> >>> Billy_Ray@SPAM.fuse.net (remove SPAM)
> >>> 2002 Jeep WJ 4 Liter Automatic
> >>> Brilliant Black Crystal Pearl Coat
> >>> Sharing is why we are all here....... or should be.
> >>> .
> >>> "tim bur" <dbrider@cac.net> wrote in message
> >>> news:43236F02.32C2328F@cac.net...
> >>> > fouled spark plug, failed injector, and a failed coil pac ,
> >>> >
> >>> > ken859@optonline.net wrote:
> >>> >
> >>> >> 2004 Jeep Grand Cherokee Limited
> >>> >> Inline 6 Cylinder Engine
> >>> >> Automatic Transmission
> >>> >> Stock - No modifications
> >>> >>
> >>> >> Symptoms:
> >>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
> >>> >> and the car starts shaking rapidly. When you accelerate the car
> >>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
> >>> >> pressing the accelerator slightly to maintain a steady velocity (which
> >>> >> is about 1500RPM) the car will experience the shake while driving.
> >>> >> Moderate acceleration the problem goes away. Lifting off of the gas
> >>> >> and the problem goes away until the above rpm range is reached and
> >>> >> then problem comes back
> >>> >>
> >>> >> Followup:
> >>> >> Computer diagnostics indicates a miss fire on cylinder # 5
> >>> >>
> >>> >> Question:
> >>> >> Could this be a clogged injector or are there other suggestions?
> >>> >>
> >>> >> TIA Ken
> >>> >
> >>
> >

 

the reason i did not type that in was because it fires a cylinder in the exchaust
stroke and he's trying too figure out a misfire in this case it's not needed
info

bllsht wrote:

> Actually, it's 1 coil pack containing 3 coils. Each coil operating 2 cylinders.
>
> In message <uqidnXAodsszSLneRVn-pQ@comcast.com>, "Matt Macchiarolo" wrote:
>
> >That's the 4.0L, not the V-8. 4.0L I-6 uses three coil packs, one per two
> >plugs.
> >
> >"tim bur" <dbrider@cac.net> wrote in message
> >news:43249F9E.6F32B587@cac.net...
> >> not on that coil pac
> >>
> >> Billy Ray wrote:
> >>
> >>> Don't each of the coil packs handle 2 cylinders? Wouldn't both misfire?
> >>>
> >>> --
> >>> .
> >>> Billy_Ray@SPAM.fuse.net (remove SPAM)
> >>> 2002 Jeep WJ 4 Liter Automatic
> >>> Brilliant Black Crystal Pearl Coat
> >>> Sharing is why we are all here....... or should be.
> >>> .
> >>> "tim bur" <dbrider@cac.net> wrote in message
> >>> news:43236F02.32C2328F@cac.net...
> >>> > fouled spark plug, failed injector, and a failed coil pac ,
> >>> >
> >>> > ken859@optonline.net wrote:
> >>> >
> >>> >> 2004 Jeep Grand Cherokee Limited
> >>> >> Inline 6 Cylinder Engine
> >>> >> Automatic Transmission
> >>> >> Stock - No modifications
> >>> >>
> >>> >> Symptoms:
> >>> >> After car warms up (3-5 Minutes) the engine idle drops to about 600RPM
> >>> >> and the car starts shaking rapidly. When you accelerate the car
> >>> >> shakes repeatedly between 600RPM and 1500RPM. At 50 miles an hour,
> >>> >> pressing the accelerator slightly to maintain a steady velocity (which
> >>> >> is about 1500RPM) the car will experience the shake while driving.
> >>> >> Moderate acceleration the problem goes away. Lifting off of the gas
> >>> >> and the problem goes away until the above rpm range is reached and
> >>> >> then problem comes back
> >>> >>
> >>> >> Followup:
> >>> >> Computer diagnostics indicates a miss fire on cylinder # 5
> >>> >>
> >>> >> Question:
> >>> >> Could this be a clogged injector or are there other suggestions?
> >>> >>
> >>> >> TIA Ken
> >>> >
> >>
> >

 

"bllsht" <nospam@invaliddot.net> wrote in message
news:qbf9i1l4ofcqsea1f6ion8ee3i0pjr77po@4ax.com...
> They sure as hell do!
> In message <43249F9E.6F32B587@cac.net>, "tim bur" wrote:
> >> Don't each of the coil packs handle 2 cylinders? Wouldn't both
misfire?

Only an open circuit would misfire both
plugs on a lost-spark ignition... a fouled
plug merely helps the other plug fire.
__
Steve
..