CEL codes p0351 and p0301 - Page 2 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #16 of 28 Old 04-19-2012, 09:01 PM
Rubi4MyMrs
Web Wheeler
 
Rubi4MyMrs's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2011
Location: Trails of
Posts: 4,088
Unless I missed it, you didn't mention it is missing. Better check the compression. & How do the plugs look?

Rubi4MyMrs is offline  
Sponsored Links
Advertisement
 
post #17 of 28 Old 04-21-2012, 01:22 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Hi Rubi4MyMrs, when I first started getting the codes I couldnt really tell if it was missing, then my dad took it for a drive and verified that it has a miss. Putting the OEM ignition coil from Napa in really amplified the problem. I think it is due to the fact that the jeep had Bosch 4 prong plugs and the plug depth wasnt as great as the Champion plugs.
I replaced the plugs yesterday because on my way up to my dads the Jeep stalled out on me and would not start again. My buddy just happened to be driving by down the same street to go to the parts store to get some ATF fluid and a filter, so I gave him money to get me some Champion plugs while he was there. We towed the jeep home and after I changed the plugs it started fine. It still has a bit of a miss and the check engine lights are on. I got cylinder 1 and 4 with the p0351 this time.
I tried misting water on the plug wires to see if the rpms would drop and to see if I could see it shorting anywhere. Did not affect it at all.
I took pictures of the plugs but I will have to wait till i get back to my house so I can upload the pictures.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #18 of 28 Old 04-21-2012, 04:43 PM
JPNinPA
Registered User
2005 LJ Wrangler 
 
Join Date: Feb 2011
Location: Dayton
Posts: 2,330
Make sure the plugs are torqued down to the correct spec and they are gapped correctly. What part # plug did you get? You want single platinum plugs.

"Never look down on anyone unless your helping them up"- Jesse Jackson
JPNinPA is offline  
 
post #19 of 28 Old 04-21-2012, 08:00 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
I have the Haynes manual and I bought single prong plugs. The PO had 4 prong Bosch plugs in it. I gapped them to 0.35.
I checked my compression today and they are all within spec. I am going to replace the plug wires tomorrow even though when I swapped the #1 wire to another location the misfire didn't follow. If I replace them I can at least have peace of mind.
this is me...

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #20 of 28 Old 04-21-2012, 08:18 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Here is the difference in plug depth and you can see that it's burning rich.


*note* I am getting the same codes and symptoms with the new plugs.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #21 of 28 Old 04-22-2012, 08:19 AM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Ok on my way up to my dads garage today the jeep surged again. It only surges I lose rpms when I am taking off from a stop and it doesn't do it every time. If I take my foot off the gas and step on it again it will start to rev and drive normally. Today I just kept my foot on the gas and it surged and dropped rpm twice in fast succession like it always does but then it had a small backfire before it continued to drive normally.
I am going to pull back the wire loom on my injectors plugs to make sure there are no cracks in the wires causing it to short or malfunction.
My dad was thinking maybe a fuel filter? But would that cause my check engine lights? I have read that the fuel filters in our jeeps normally last the lifetime of the jeeps.
I am also going to check all my vacuum hoses for cracks and wear. Any other ideas?
Thanks guys.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #22 of 28 Old 04-22-2012, 10:55 AM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Alright I went to the auto parts store and on my way back my jeep stalled again, same two codes this time I also got P0505 (M) Idle Air Control Motor Circuits, SBEC II and P1282 Fuel Pump Relay Control Circuit, An open or shorted condition detected in the fuel pump relay control circuit. I can feel the fuel pump relay clicking when I get my dad to turn the key.
Could a crank positioning sensor be causing all my headaches?

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #23 of 28 Old 04-24-2012, 03:17 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Alright another update.
I changed the plug wires, I changed the Cam Sensor and the Crank positioning sensor and took it for a drive and the original two codes came back up. Cylinder 1 misfire and ignition coil.
This is driving me nuts.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #24 of 28 Old 04-24-2012, 05:14 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Could a worn timing chain be causing this or would it misfire on all the cylinders? Anyone have any insight?

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #25 of 28 Old 04-24-2012, 06:28 PM
Rubi4MyMrs
Web Wheeler
 
Rubi4MyMrs's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2011
Location: Trails of
Posts: 4,088
That would go back to the info in post #10 (cam/crank sync). I don't know if the timing chain can wear that much to throw everything off that much but I guess it's possible. You might have to bite the bullet & have it scanned with the DRB scanner (dealer or SOME independent shops) or one like it that can read real time cam/crank sync. I read that the Sun Solus scanner can also read cam/crank sync.
Rubi4MyMrs is offline  
post #26 of 28 Old 04-24-2012, 09:09 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
I may have to.
I am going to Napa tomorrow to pick up a new fuel pump assembly. I have read that that can be an issue as well. The jeep is high milage and I doubt it's been changed. I will keep you guys posted. I have read so many threads that just die off with no resolution posted. So frustrating.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #27 of 28 Old 04-25-2012, 08:34 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Well today I took the MSD ignition coil and control module out. Now I'm running an OEM coil with champion plugs.
I also cut a hole in the back floor of the tub so I could check the fuel pump and found that the retaining ring wasn't seated properly and the pump assembly wasn't making a proper seal.
I drove the jeep home and there was no stalling or hesitation. (so far) I have learnt to not get my hopes up.
My CEL came on with just a cylinder 1 misfire. I will post tomorrow to let you guys know if the stalling comes back.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
post #28 of 28 Old 04-26-2012, 02:38 PM Thread Starter
JaikYJ
Registered User
 
JaikYJ's Avatar
1999 TJ Wrangler 
 
Join Date: Aug 2008
Location: Ontario, Canada
Posts: 1,134
Well I drove the jeep around today and it hasn't stalled or hesitated so i am pretty surebmy fuel system not being properly pressurized was causing that issue.

My ignition coil code was being caused by my MSD setup.
Now I just have to track down my cylinder 1 misfire.

87 YJ(sold), 97 TJ(sold), 99 TJ(daily)
03 R1 (fun)68 Mustang Coupe(summer)
67 Fastback(resto)
JaikYJ is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
P0301 and P0300 Codes. running out of crap to change RMiksits TJ Wrangler Technical Forum 19 12-08-2012 08:40 AM
P0301 olucier TJ Wrangler Technical Forum 0 04-20-2011 08:00 PM
Codes p0301 p0304 ProjectWhiteTJ TJ Wrangler Technical Forum 56 10-05-2009 05:05 AM
FAQ - Check Engine Light and Diagnostic Trouble Codes (Error Codes, Problem Codes) Wheelin98TJ TJ Wrangler Technical Forum 6 05-15-2009 05:05 PM
Check Engine Light Codes P0300 & P0301 Ichabod1960 TJ Wrangler Technical Forum 5 12-31-2007 11:56 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome