HELP!!!! Strange Misfire I can't fix.

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Nov 22, 2014 | 12:21 PM

#31

dschappell

Seasoned Member

Joined: May 2013

Posts: 410

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From: North Atlantic - Delaware

Year: 1999

Model: Cherokee

Engine: Inline 6 4.0

Quote:

Originally Posted by CCKen

The preferred plugs for the 2000/2001 engine are NGK ZFR5N. I've been told that the dealers are handing out these plugs if you were to go to them for the Champion RC12ECC plugs.

So I'm going to do the plugs anyway just to see if that is my problem. If not, what would be your next guess?

Nov 22, 2014 | 12:31 PM

#32

CCKen

CF Veteran

Joined: Aug 2010

Posts: 8,357

Likes: 103

From: Canton, MI

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by dschappell

So I'm going to do the plugs anyway just to see if that is my problem. If not, what would be your next guess?

All my next guesses were in my previous posts.

Nov 22, 2014 | 01:13 PM

#33

dschappell

Seasoned Member

Joined: May 2013

Posts: 410

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From: North Atlantic - Delaware

Year: 1999

Model: Cherokee

Engine: Inline 6 4.0

Alright, thanks

Nov 23, 2014 | 07:09 AM

#34

CCKen

CF Veteran

Joined: Aug 2010

Posts: 8,357

Likes: 103

From: Canton, MI

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by dschappell

I need help. So the jeep doesn't have coil rails. It has the distributor still.

Sorry, I should have paid closer attention. I didn't see that you hijacked this thread.

Disregard all my chatter about coil rails and such. That was for the OP.

Nov 23, 2014 | 01:03 PM

#35

dschappell

Seasoned Member

Joined: May 2013

Posts: 410

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From: North Atlantic - Delaware

Year: 1999

Model: Cherokee

Engine: Inline 6 4.0

I didn't mean to hijack. The OP had a similar issue. I thought it better to ask here instead of ask the same question again.

Nov 23, 2014 | 02:08 PM

#36

guiness_guy

Thread Starter

Newbie

Joined: May 2012

Posts: 12

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From: Pueblo West

Year: 2001

Model: Cherokee

Engine: 4.0

So after a brand new coil pack switching back to copper core plugs and a brand new locking mopar gas cap and using the PCM reset suggested I put a little over 100 miles on her and no CEL. Thank you all for the suggestions and help. She's purring like a kitten again.

Nov 23, 2014 | 02:15 PM

#37

CCKen

CF Veteran

Joined: Aug 2010

Posts: 8,357

Likes: 103

From: Canton, MI

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by guiness_guy

Good work mate, and thanks for the follow up.

Nov 23, 2014 | 02:22 PM

#38

CCKen

CF Veteran

Joined: Aug 2010

Posts: 8,357

Likes: 103

From: Canton, MI

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by dschappell

I didn't mean to hijack. The OP had a similar issue. I thought it better to ask here instead of ask the same question again.

No harm bud, but it's always a good idea to start a new thread, especially if you have a different ignition system.

If you are having random misfires it could be your Camashaft Position Sensor (inside your distributor). Check the wiring to the CMP for chafing/exposed wires. If not defects are noted you may want to try a new CMP. Other than OEM (big $) NAPA sells a good one.

No guarantee it will fix your problem though. Your choice.

Nov 23, 2014 | 07:11 PM

#39

dschappell

Seasoned Member

Joined: May 2013

Posts: 410

Likes: 0

From: North Atlantic - Delaware

Year: 1999

Model: Cherokee

Engine: Inline 6 4.0

Quote:

Originally Posted by CCKen

No harm bud, but it's always a good idea to start a new thread, especially if you have a different ignition system. If you are having random misfires it could be your Camashaft Position Sensor (inside your distributor). Check the wiring to the CMP for chafing/exposed wires. If not defects are noted you may want to try a new CMP. Other than OEM (big $) NAPA sells a good one. No guarantee it will fix your problem though. Your choice.

I will remember this for the future, thank you.