2000 xj Please help!! - JeepForum.com
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post #1 of 30 Old 07-08-2020, 08:27 PM Thread Starter
junkxj83
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2000 xj Please help!!

Im racking my head on this jeep I bought. I have replaced CPS CKPS fuel pump ignition coil, everything I can think of. I have no spark to 5&6 coming out of the coil pack. I have two side by side and have the same issues. Can anyone give me some insight as to where to look? Maybe a broken wire to the ecm? any help is appreciated. thank you guys so much. I used to be on here and have rebuilt an entire xj thanks to you guys.

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post #2 of 30 Old 07-08-2020, 08:47 PM
2oldjeeps
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sounds like a wire as you think. i havnt been there but you might do a quik ohms check of all wires on that connector. un hook batt and just check to ground as a quik test for a differentce on that one,5/6
that checks back to comp..
you have 2 packs?. check all 3 coils in each.

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #3 of 30 Old 07-08-2020, 09:19 PM Thread Starter
junkxj83
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yeah I have the original and the new one I bought. both are doing the same thing so that led me to believe its a wire. Im giving up for the night. the skeeters are eating me alive. I hope tomorrow brings a new light on things. Im ready to get rid of this thing and can't til its fixed. thanks!
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post #4 of 30 Old 07-09-2020, 08:16 AM
CJ7-Tim
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Is, or was, the Check Engine Light ON ?

Have you tested the coil rail ? Have you looked up which 2000-01 cylinders fire in pairs on the coil rail ?


Quote:
I have two side by side and have the same issues ...
Two of what, Jeeps or coil rails ?



Your genuine Jeep Factory Service Manual should have diagnostics and troubleshooting flow charts and expected testing results for all the OBD sensors and the coil pack. >> www.pacificcoastmanuals.com

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“When the people find that they can vote themselves money, that will herald the end of the Republic.”

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post #5 of 30 Old 07-09-2020, 08:34 AM
jtec
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this is a 2000 XJ, uses a coil RAIL.
cylinders are numbered front #1 and rear #6.
It fires in pairs ( waste spark), TIP the pairs always add up to 7, Cyl 1and 6 fire together.

How are you checking spark at 5 and 6?

Have you checked for codes?

What is CPS and CKPS ?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 30 Old 07-09-2020, 06:40 PM
2oldjeeps
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3 coils. one at 1 and 2 one at 3 and 4 one at 5 and 6.
am i wrong?
so,3 wires fire 3 coils one at a time.
coil 5 and 6 dont fire at either 5 or 6 on time.
the coil
or the wire going to it...?


going from memory, gotta look at book,,,later.
but i remember 4 wires going to the coil pack, one hot, three get pulled low by computer one at a time.


if thats right its the 5/6 wire ,coil,or comp circuit...probably the wire or connector.

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #7 of 30 Old 07-09-2020, 06:50 PM
jtec
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coil rail - is 3 coils. the coil fires 2 plugs at same time.

those 2 plugs are called paired cylinders.the pairs are (note pairs =7)
1 and 6
2 and 5
3 and 4

which 2 cylinders are not firing?
OR tell us what color wire (1 of 4) is the issue - we will look it up.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #8 of 30 Old 07-09-2020, 06:54 PM
2oldjeeps
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Quote:
Originally Posted by jtec View Post
this is a 2000 XJ, uses a coil RAIL.
cylinders are numbered front #1 and rear #6.
It fires in pairs ( waste spark), TIP the pairs always add up to 7, Cyl 1and 6 fire together.

How are you checking spark at 5 and 6?

Have you checked for codes?

What is CPS and CKPS ?

1 and 2 3 and 4, 5 and 6 look at where the coils are and control wires... 1 and 6 cant fire at once...

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #9 of 30 Old 07-09-2020, 07:15 PM
jtec
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`the firing is as i posted. cylinders are paired those 2 are at TDC at sane time, 1 in compression the other in exhaust.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #10 of 30 Old 07-09-2020, 07:25 PM
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Quote:
Originally Posted by jtec View Post
coil rail - is 3 coils. the coil fires 2 plugs at same time.

those 2 plugs are called paired cylinders.the pairs are (note pairs =7)
1 and 6
2 and 5
3 and 4

which 2 cylinders are not firing?
OR tell us what color wire (1 of 4) is the issue - we will look it up.
Sorry to jump in and interrupt the excellent feedbacks... what do you mean:
(note pairs =7) ?

I re-read all the posts a couple times each and cannot figure out the 3 pairs equal 7. I hope to learn something here today.
Thank you Sir.

Thank You,
Bo
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post #11 of 30 Old 07-09-2020, 08:42 PM
2oldjeeps
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the picture in the book is the same as i see when i open the hood on my 99 wj 4.0
or my 00 xi. 3 coils are mounted directly on the plugs. they can go physically only one way. front coil on plugs 1 and 2. middle coil on plugs 3 and 4. back coil on plugs 5 and 6. there are just 4 wires on the connector.
the book says # 2 is common to all coils. pins 1,3,4 are the other end of the coils.
its obvious that when a coil fires both plugs connected are fired,.
that can only mean, plugs 1 and 2, 3 and 4, 5 and 6 are fired together.

its impossible to fire 1 and 6 together as those 2 coils would also fire 2 and 5
since the coils connect to those plugs !!!


the op said 5 and 6 are not firing. if the coils are good, all three,
then its the wire going to 5 and 6 as stated earlier, or the computer. probably the wire or connector...


im counting cylinders from front to back as 1,2,3,4,5.6. the only way i know...


firing order in book is 1 5 3 6 2 4. wasted spark goes to

1 2, 5 6, 3 4,, 6 5, 2 1, 43. has to be the adjacent plug.




its physically impossible to do different...

its the wire !!!

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #12 of 30 Old 07-10-2020, 04:44 AM
CJ7-Tim
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This is all easily found in your genuine Jeep Factory Service Manual you purchased from www.pacificcoastmanuals.com

4.0L

The 2000-01 4.0L 6-cylinder engine uses a one-piece coil rail containing three independent coils. Although cylinder firing order is the same as 4.0L 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). The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. One electrical connector (located at the rear end of the coil rail) is used for all three coils.Because of coil design, spark plug cables (secondary cables) are not used. A distributor is not used with the 4.0L engine.The ignition system is controlled by the Powertrain Control Module (PCM).

1+6 = 7
2+5 = 7
3+4 = 7
.

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post #13 of 30 Old 07-10-2020, 08:29 AM
jtec
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riderboy1961 the #7 is a mnemonic device to help remember which cyls are pared.

junkxj83 how is the troubleshoot going? anything new to mention?
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #14 of 30 Old 07-10-2020, 12:50 PM
2oldjeeps
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curious,if i got it wrong...explain how a coil physically attached to plugs 1 and 2,
which are in cylinders 1 and 2, fires plugs 1 and 6 ??

99wj,143,000 miles
00xj,177,000 miles
10hummer3,74,000 miles
98xj,130,000 miles
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post #15 of 30 Old 07-10-2020, 03:27 PM
CJ7-Tim
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By the magic of modern computer science. The coils do what the PCM tells them to do.


The 3 coil lumps are in a line, but inside are 6 individual coil modules with wires directing the spark to the appropriate cylinders. Even with the coil-on-plug spark rail ignition, spark plugs should be changed according to the maintenance recommendations in your Owners Manual, or Factory Service Manual.

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“When the people find that they can vote themselves money, that will herald the end of the Republic.”

- Benjamin Franklin
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