Re: Help with rough idle and acceleration - TIA
 

We are not talking about a "regular" coil.


In message <4328FEDE.34158107@cox.net>, "L.W." wrote:

> An experiment would be to hook two spark plugs to a regular coil,
>and you find only one will fire.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>bllsht wrote:
>>
>> I can't speak on the picture you posted, but what is used on the current 4.0L is
>> ONE coil firing TWO plugs simultaneously in OPPOSITE polarity.
>>
>> If one coil doesn't work, 2 plugs don't get spark.

Re: Help with rough idle and acceleration - TIA
 

We are not talking about a "regular" coil.


In message <4328FEDE.34158107@cox.net>, "L.W." wrote:

> An experiment would be to hook two spark plugs to a regular coil,
>and you find only one will fire.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>bllsht wrote:
>>
>> I can't speak on the picture you posted, but what is used on the current 4.0L is
>> ONE coil firing TWO plugs simultaneously in OPPOSITE polarity.
>>
>> If one coil doesn't work, 2 plugs don't get spark.

Re: Help with rough idle and acceleration - TIA
 

Yes, but it proves there must be two coils within the one module,
having two primaries and secondaries in order to fire two plugs, with
one hot wire in parallel.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

bllsht wrote:
>
> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

Yes, but it proves there must be two coils within the one module,
having two primaries and secondaries in order to fire two plugs, with
one hot wire in parallel.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

bllsht wrote:
>
> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

Yes, but it proves there must be two coils within the one module,
having two primaries and secondaries in order to fire two plugs, with
one hot wire in parallel.
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

bllsht wrote:
>
> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

For What it's Worth

WJ Ignition System Description and Operation pages D2 & D3

IGNITION COIL—4.0L ENGINE

DESCRIPTION

A one-piece coil rail assembly containing three

individual coils is used on the 4.0L 6–cylinder engine

(Fig. 1). The coil rail must be replaced as one assembly.

The bottom of the coil is equipped with 6 individual

rubber boots (Fig. 1) to seal the 6 spark plugs to

the coil. Inside each rubber boot is a spring. The

spring is used for a mechanical contact between the

coil and the top of the spark plug. These rubber boots

and springs are a permanent part of the coil and are

not serviced separately.

(1) The coil is bolted directly to the cylinder head

(Fig. 2). One electrical connector (located at rear of

coil) is used for all three coils.

OPERATION

Although cylinder firing order is the same as 4.0L

Jeep engines of previous years, spark plug firing is

not. The 3 coils dual-fire the spark plugs on cylinders

1–6, 2–5 and/or 3–4. When one cylinder is being fired

(on compression stroke), the spark to the opposite

cylinder is being wasted (on exhaust stroke).

Battery voltage is supplied to the three ignition

coils from the ASD relay. The Powertrain Control

Module (PCM) opens and closes the ignition coil

ground circuit for ignition coil operation.

Base ignition timing is not adjustable. By controlling

the coil ground circuit, the PCM is able to set

the base timing and adjust the ignition timing

advance. This is done to meet changing engine operating

conditions.

The ignition coil is not oil filled. The windings are

embedded in an epoxy compound. This provides heat

and vibration resistance that allows the ignition coil

to be mounted on the engine.

Because of coil design, spark plug cables (secondary

cables) are not used. The cables are integral

within the coil rail.








--
..
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.
..
"L.W. ("ßill") ------ III" <----------@cox.net> wrote in message
news:4329159A.157B68E2@cox.net...
> Yes, but it proves there must be two coils within the one module,
> having two primaries and secondaries in order to fire two plugs, with
> one hot wire in parallel.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> bllsht wrote:
>>
>> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

For What it's Worth

WJ Ignition System Description and Operation pages D2 & D3

IGNITION COIL—4.0L ENGINE

DESCRIPTION

A one-piece coil rail assembly containing three

individual coils is used on the 4.0L 6–cylinder engine

(Fig. 1). The coil rail must be replaced as one assembly.

The bottom of the coil is equipped with 6 individual

rubber boots (Fig. 1) to seal the 6 spark plugs to

the coil. Inside each rubber boot is a spring. The

spring is used for a mechanical contact between the

coil and the top of the spark plug. These rubber boots

and springs are a permanent part of the coil and are

not serviced separately.

(1) The coil is bolted directly to the cylinder head

(Fig. 2). One electrical connector (located at rear of

coil) is used for all three coils.

OPERATION

Although cylinder firing order is the same as 4.0L

Jeep engines of previous years, spark plug firing is

not. The 3 coils dual-fire the spark plugs on cylinders

1–6, 2–5 and/or 3–4. When one cylinder is being fired

(on compression stroke), the spark to the opposite

cylinder is being wasted (on exhaust stroke).

Battery voltage is supplied to the three ignition

coils from the ASD relay. The Powertrain Control

Module (PCM) opens and closes the ignition coil

ground circuit for ignition coil operation.

Base ignition timing is not adjustable. By controlling

the coil ground circuit, the PCM is able to set

the base timing and adjust the ignition timing

advance. This is done to meet changing engine operating

conditions.

The ignition coil is not oil filled. The windings are

embedded in an epoxy compound. This provides heat

and vibration resistance that allows the ignition coil

to be mounted on the engine.

Because of coil design, spark plug cables (secondary

cables) are not used. The cables are integral

within the coil rail.








--
..
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.
..
"L.W. ("ßill") ------ III" <----------@cox.net> wrote in message
news:4329159A.157B68E2@cox.net...
> Yes, but it proves there must be two coils within the one module,
> having two primaries and secondaries in order to fire two plugs, with
> one hot wire in parallel.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> bllsht wrote:
>>
>> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

For What it's Worth

WJ Ignition System Description and Operation pages D2 & D3

IGNITION COIL—4.0L ENGINE

DESCRIPTION

A one-piece coil rail assembly containing three

individual coils is used on the 4.0L 6–cylinder engine

(Fig. 1). The coil rail must be replaced as one assembly.

The bottom of the coil is equipped with 6 individual

rubber boots (Fig. 1) to seal the 6 spark plugs to

the coil. Inside each rubber boot is a spring. The

spring is used for a mechanical contact between the

coil and the top of the spark plug. These rubber boots

and springs are a permanent part of the coil and are

not serviced separately.

(1) The coil is bolted directly to the cylinder head

(Fig. 2). One electrical connector (located at rear of

coil) is used for all three coils.

OPERATION

Although cylinder firing order is the same as 4.0L

Jeep engines of previous years, spark plug firing is

not. The 3 coils dual-fire the spark plugs on cylinders

1–6, 2–5 and/or 3–4. When one cylinder is being fired

(on compression stroke), the spark to the opposite

cylinder is being wasted (on exhaust stroke).

Battery voltage is supplied to the three ignition

coils from the ASD relay. The Powertrain Control

Module (PCM) opens and closes the ignition coil

ground circuit for ignition coil operation.

Base ignition timing is not adjustable. By controlling

the coil ground circuit, the PCM is able to set

the base timing and adjust the ignition timing

advance. This is done to meet changing engine operating

conditions.

The ignition coil is not oil filled. The windings are

embedded in an epoxy compound. This provides heat

and vibration resistance that allows the ignition coil

to be mounted on the engine.

Because of coil design, spark plug cables (secondary

cables) are not used. The cables are integral

within the coil rail.








--
..
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.
..
"L.W. ("ßill") ------ III" <----------@cox.net> wrote in message
news:4329159A.157B68E2@cox.net...
> Yes, but it proves there must be two coils within the one module,
> having two primaries and secondaries in order to fire two plugs, with
> one hot wire in parallel.
> God Bless America, Bill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> bllsht wrote:
>>
>> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

One coil. Two spark plugs. Both spark plugs fire EVERY crankshaft revolution
simultaneously. One spark plug always fires negatively (from center electrode
to ground electrode). The other spark plug always fires positively (from ground
electrode to center electrode).

Does that sound "parallel" to you?

You always have a link for everything, yet I haven't seen any links from you on
this subject yet. Having trouble finding one that agrees with you?


In message <4329159A.157B68E2@cox.net>, "L.W." wrote:

> Yes, but it proves there must be two coils within the one module,
>having two primaries and secondaries in order to fire two plugs, with
>one hot wire in parallel.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>bllsht wrote:
>>
>> We are not talking about a "regular" coil.

Re: Help with rough idle and acceleration - TIA
 

One coil. Two spark plugs. Both spark plugs fire EVERY crankshaft revolution
simultaneously. One spark plug always fires negatively (from center electrode
to ground electrode). The other spark plug always fires positively (from ground
electrode to center electrode).

Does that sound "parallel" to you?

You always have a link for everything, yet I haven't seen any links from you on
this subject yet. Having trouble finding one that agrees with you?


In message <4329159A.157B68E2@cox.net>, "L.W." wrote:

> Yes, but it proves there must be two coils within the one module,
>having two primaries and secondaries in order to fire two plugs, with
>one hot wire in parallel.
> God Bless America, Bill O|||||||O
>mailto:-------------------- http://www.----------.com/
>
>bllsht wrote:
>>
>> We are not talking about a "regular" coil.