Re: P0303 cylinder #3 misfire
 

Carl wrote:
> agreed.
>
> "billy ray" wrote ...
>> If a coil was bad then two cylinders
>> (3 and 4) would be misfiring.

It can also be the rail. I've seen where
the rail has failed internally and that was
causing the misfire.

--
DougW

Re: P0303 cylinder #3 misfire
 

Carl wrote:
> agreed.
>
> "billy ray" wrote ...
>> If a coil was bad then two cylinders
>> (3 and 4) would be misfiring.

It can also be the rail. I've seen where
the rail has failed internally and that was
causing the misfire.

--
DougW

Re: P0303 cylinder #3 misfire
 

Carl wrote:
> agreed.
>
> "billy ray" wrote ...
>> If a coil was bad then two cylinders
>> (3 and 4) would be misfiring.

It can also be the rail. I've seen where
the rail has failed internally and that was
causing the misfire.

--
DougW

Re: P0303 cylinder #3 misfire
 

Ok, but for one coil power two cylinders I would think there is one
input connection on the coil to rail and one connection going to each
plug with a connection at each plug, no?

Haven't seen the setup yet.

Mike

bllsht wrote:
>
> A bad connection would kill either 2 or all cylinders.
>
> On Sat, 06 Jan 2007 20:32:50 -0500, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >Or it's electronic plug and socket are dirty.....
> >
> >Mike
> >
> >Jeff Strickland wrote:
> >>
> >> So, one of the coils is bad.
> >>
> >> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> >> news:bdqdnb4NANz57QHYnZ2dnUVZ_tOmnZ2d@comcast.com. ..
> >> > Jeff, no plug wires or dist cap on an 00 and 01. Coil rail with three coil
> >> > packs.
> >> >
> >> > Carl
> >> >
> >> >
> >> > "Jeff Strickland" <crwlr@yahoo.com> wrote in message
> >> > news:OfidnY5u3NmnmQHYnZ2dnUVZ_h6jnZ2d@ez2.net...
> >> >> With a misfire, I'd be looking at the plug wires or coil. I'd check plug
> >> >> wires if there was a distributor, or I'd look at the coil if there was a
> >> >> separate coil for each cylinder, or a coil for every two cylinders.
> >> >>
> >> >>
> >> >>
> >> >> "01XJ" <adam.tsacoumangos@gmail.com> wrote in message
> >> >> news:1167779855.090317.153570@v33g2000cwv.googlegr oups.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?
> >> >>>
> >> >>
> >> >
> >> >

Re: P0303 cylinder #3 misfire
 

Ok, but for one coil power two cylinders I would think there is one
input connection on the coil to rail and one connection going to each
plug with a connection at each plug, no?

Haven't seen the setup yet.

Mike

bllsht wrote:
>
> A bad connection would kill either 2 or all cylinders.
>
> On Sat, 06 Jan 2007 20:32:50 -0500, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >Or it's electronic plug and socket are dirty.....
> >
> >Mike
> >
> >Jeff Strickland wrote:
> >>
> >> So, one of the coils is bad.
> >>
> >> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> >> news:bdqdnb4NANz57QHYnZ2dnUVZ_tOmnZ2d@comcast.com. ..
> >> > Jeff, no plug wires or dist cap on an 00 and 01. Coil rail with three coil
> >> > packs.
> >> >
> >> > Carl
> >> >
> >> >
> >> > "Jeff Strickland" <crwlr@yahoo.com> wrote in message
> >> > news:OfidnY5u3NmnmQHYnZ2dnUVZ_h6jnZ2d@ez2.net...
> >> >> With a misfire, I'd be looking at the plug wires or coil. I'd check plug
> >> >> wires if there was a distributor, or I'd look at the coil if there was a
> >> >> separate coil for each cylinder, or a coil for every two cylinders.
> >> >>
> >> >>
> >> >>
> >> >> "01XJ" <adam.tsacoumangos@gmail.com> wrote in message
> >> >> news:1167779855.090317.153570@v33g2000cwv.googlegr oups.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?
> >> >>>
> >> >>
> >> >
> >> >

Re: P0303 cylinder #3 misfire
 

Ok, but for one coil power two cylinders I would think there is one
input connection on the coil to rail and one connection going to each
plug with a connection at each plug, no?

Haven't seen the setup yet.

Mike

bllsht wrote:
>
> A bad connection would kill either 2 or all cylinders.
>
> On Sat, 06 Jan 2007 20:32:50 -0500, Mike Romain <romainm@sympatico.ca>
> wrote:
>
> >Or it's electronic plug and socket are dirty.....
> >
> >Mike
> >
> >Jeff Strickland wrote:
> >>
> >> So, one of the coils is bad.
> >>
> >> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> >> news:bdqdnb4NANz57QHYnZ2dnUVZ_tOmnZ2d@comcast.com. ..
> >> > Jeff, no plug wires or dist cap on an 00 and 01. Coil rail with three coil
> >> > packs.
> >> >
> >> > Carl
> >> >
> >> >
> >> > "Jeff Strickland" <crwlr@yahoo.com> wrote in message
> >> > news:OfidnY5u3NmnmQHYnZ2dnUVZ_h6jnZ2d@ez2.net...
> >> >> With a misfire, I'd be looking at the plug wires or coil. I'd check plug
> >> >> wires if there was a distributor, or I'd look at the coil if there was a
> >> >> separate coil for each cylinder, or a coil for every two cylinders.
> >> >>
> >> >>
> >> >>
> >> >> "01XJ" <adam.tsacoumangos@gmail.com> wrote in message
> >> >> news:1167779855.090317.153570@v33g2000cwv.googlegr oups.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?
> >> >>>
> >> >>
> >> >
> >> >

Re: P0303 cylinder #3 misfire
 

Mike Romain wrote:
> Ok, but for one coil power two cylinders I would think there is one
> input connection on the coil to rail and one connection going to each
> plug with a connection at each plug, no?

IIRC, five wires.
three ecu grounds, two ecu battery.
Plus and one connection for each plug

http://www.wjjeeps.com/engine/coil_rail_assembly_01.jpg

http://www.motorage.com/motorage/dat...30/article.pdf

--
DougW

Re: P0303 cylinder #3 misfire
 

Mike Romain wrote:
> Ok, but for one coil power two cylinders I would think there is one
> input connection on the coil to rail and one connection going to each
> plug with a connection at each plug, no?

IIRC, five wires.
three ecu grounds, two ecu battery.
Plus and one connection for each plug

http://www.wjjeeps.com/engine/coil_rail_assembly_01.jpg

http://www.motorage.com/motorage/dat...30/article.pdf

--
DougW

Re: P0303 cylinder #3 misfire
 

Mike Romain wrote:
> Ok, but for one coil power two cylinders I would think there is one
> input connection on the coil to rail and one connection going to each
> plug with a connection at each plug, no?

IIRC, five wires.
three ecu grounds, two ecu battery.
Plus and one connection for each plug

http://www.wjjeeps.com/engine/coil_rail_assembly_01.jpg

http://www.motorage.com/motorage/dat...30/article.pdf

--
DougW

Re: P0303 cylinder #3 misfire
 

One connector, 4 wires. 12v in and 3 driver wires.

On Sun, 07 Jan 2007 12:05:11 -0500, Mike Romain <romainm@sympatico.ca>
wrote:

>Ok, but for one coil power two cylinders I would think there is one
>input connection on the coil to rail and one connection going to each
>plug with a connection at each plug, no?
>
>Haven't seen the setup yet.
>
>Mike
>
>bllsht wrote:
>>
>> A bad connection would kill either 2 or all cylinders.
>>
>> On Sat, 06 Jan 2007 20:32:50 -0500, Mike Romain <romainm@sympatico.ca>
>> wrote:
>>
>> >Or it's electronic plug and socket are dirty.....
>> >
>> >Mike
>> >
>> >Jeff Strickland wrote:
>> >>
>> >> So, one of the coils is bad.
>> >>
>> >> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
>> >> news:bdqdnb4NANz57QHYnZ2dnUVZ_tOmnZ2d@comcast.com. ..
>> >> > Jeff, no plug wires or dist cap on an 00 and 01. Coil rail with three coil
>> >> > packs.
>> >> >
>> >> > Carl
>> >> >
>> >> >
>> >> > "Jeff Strickland" <crwlr@yahoo.com> wrote in message
>> >> > news:OfidnY5u3NmnmQHYnZ2dnUVZ_h6jnZ2d@ez2.net...
>> >> >> With a misfire, I'd be looking at the plug wires or coil. I'd check plug
>> >> >> wires if there was a distributor, or I'd look at the coil if there was a
>> >> >> separate coil for each cylinder, or a coil for every two cylinders.
>> >> >>
>> >> >>
>> >> >>
>> >> >> "01XJ" <adam.tsacoumangos@gmail.com> wrote in message
>> >> >> news:1167779855.090317.153570@v33g2000cwv.googlegr oups.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?
>> >> >>>
>> >> >>
>> >> >
>> >> >