Engine Misfire Issues: P2302 - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 06-26-2019, 07:11 PM Thread Starter
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Engine Misfire Issues: P2302

Hello, I have had some trouble tracing down some issues I have been having with my 2007 JKU with 165k miles on it. When I start it up, there is a solid check engine light and after about 30 seconds of running, the idle gets really rough and the check engine light starts blinking.

I have engine codes:
P0300 Multiple Cylinder Misfire
P2302 Ignition Coil 1 Secondary Circuit - Insufficient Ionization

So far I have replaced the plugs, wires, and coil pack all with mopar replacements. Hoping to not have to keep dumping money into it by simply trying to guess what it is. I also check/cleaned the grounds on the fenders and they seemed fine.


Not sure if its related, but the engine also has a small coolant leak at the intake manifold, and sounds like it might have a small exhaust leak at the headers at start up but always went away once warmed up. These have been around for a while but the codes are new.

Thanks in advance.

Last edited by j3ff3ry_j33p; 09-20-2019 at 06:59 PM.
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post #2 of 14 Old 06-26-2019, 09:27 PM
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Have you tried clearing the codes to see if they come right back? The po300 is most likely a fuel delivery problem. Without proper scan tools your just going to be throwing money at it.


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post #3 of 14 Old 06-27-2019, 03:57 PM Thread Starter
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Quote:
Originally Posted by rich6700 View Post
Have you tried clearing the codes to see if they come right back? The po300 is most likely a fuel delivery problem. Without proper scan tools your just going to be throwing money at it.


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I have access to a Snapon Scanner which I got the original codes from but haven't been able to use it to clear them (have to borrow it again). I will try that next, thanks.
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post #4 of 14 Old 07-08-2019, 06:46 PM Thread Starter
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I was able to clear the codes and they came right back within 18 seconds of running. I am using OBD Fusion app for monitoring for now. Are there any factory readings I can compare to?
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post #5 of 14 Old 08-23-2019, 05:18 PM Thread Starter
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Is there a good wiring diagram to help check the wires between the PCM and coil pack? Last step before I replace the PCM itself.
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post #6 of 14 Old 08-27-2019, 05:13 PM Thread Starter
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Bump, anyone have a wiring diagram? I would like to try to test if I have any broken wires going to the coil pack or injectors before I blow money on a new PCM.
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post #7 of 14 Old 08-27-2019, 09:42 PM
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Negative on wiring diagram.

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post #8 of 14 Old 09-16-2019, 07:56 PM Thread Starter
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I ended up piecing together wiring diagrams sourced from jkfreaks and wranglerforum. Tested the wires between the pcm and the coil pack and they were good. Installed a new PCM and seems to have fixed the issue.
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post #9 of 14 Old 09-17-2019, 08:00 AM
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I was just going to chime in on this.

I've had similar issues with O2 related codes. After numerous rounds of replacing the sensors, I swapped in a new main engine wiring harness, thinking maybe it had been damaged (Mr. Nibbles anyone?). That offered no improvement.

Which led me to suspect an issue with he connector on the PCM or something within the PCM itself, since everything else had been replaced and checked and double-checked ad-nausea.

New PCM is on the way.

_
'76 CJ-7, '43 CJ-2a, '78 Bronco,'78 CJ-7, '75 CJ-5, '78 CJ-7, '80 CJ-7, '78 SJ, '79 SJ, '78 and a '76 FJ-40 , '90 XJ, '91 XJ, '86 CJ-7, '95 ZJ, '68 CJ-101 Commando, '00 TJ, '68 M-715, 2 '86 Military Blazers, '96 LR Discovery, '86 CJ-7, '91 YJ, '99 TJ, 07' JKU Rubi, 1988 YJ, 1973 Commando, 3 Diesel Excursions....
Now back to a 2013 JKU Rubicon with "stuff", planning 37's with minimal lift.

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post #10 of 14 Old 09-20-2019, 05:38 PM Thread Starter
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Quote:
Originally Posted by Guruman View Post
I was just going to chime in on this.

I've had similar issues with O2 related codes. After numerous rounds of replacing the sensors, I swapped in a new main engine wiring harness, thinking maybe it had been damaged (Mr. Nibbles anyone?). That offered no improvement.

Which led me to suspect an issue with he connector on the PCM or something within the PCM itself, since everything else had been replaced and checked and double-checked ad-nausea.

New PCM is on the way.
Yeah, after reading every forum post related to the two code combination, it seemed most time it was a bad PCM. After confirming wires between PCM and coil pack were good, I decided to do it. I even tore apart the PCM hoping to see something burned out I could replace but did not notice anything.
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post #11 of 14 Old 09-20-2019, 07:02 PM
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Quote:
Originally Posted by Guruman View Post
I was just going to chime in on this.

I've had similar issues with O2 related codes. After numerous rounds of replacing the sensors, I swapped in a new main engine wiring harness, thinking maybe it had been damaged (Mr. Nibbles anyone?). That offered no improvement.

Which led me to suspect an issue with he connector on the PCM or something within the PCM itself, since everything else had been replaced and checked and double-checked ad-nausea.

New PCM is on the way.




interested to see this be the remedy for your issues. keep us updated,dude...




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post #12 of 14 Old 11-03-2019, 08:57 AM
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what was the verdict in getting the new PCM?

Ran into the same problem p0300 and p2302


I changed fuel injectors coil pack plugs and wires/plug cables
cleared codes and I'm still getting p2302

your help in this matter would be greatly appreciated
thank you in advance
B
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post #13 of 14 Old 11-04-2019, 08:31 AM
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my new PCM is still sitting in the box... Switching it is a pain for me because of the custom RIPP tune I'm running.

I bought a new house, and everything else was shifted to the back burner. Once I get the new shop put back together, I'll get it swapped out.

_
'76 CJ-7, '43 CJ-2a, '78 Bronco,'78 CJ-7, '75 CJ-5, '78 CJ-7, '80 CJ-7, '78 SJ, '79 SJ, '78 and a '76 FJ-40 , '90 XJ, '91 XJ, '86 CJ-7, '95 ZJ, '68 CJ-101 Commando, '00 TJ, '68 M-715, 2 '86 Military Blazers, '96 LR Discovery, '86 CJ-7, '91 YJ, '99 TJ, 07' JKU Rubi, 1988 YJ, 1973 Commando, 3 Diesel Excursions....
Now back to a 2013 JKU Rubicon with "stuff", planning 37's with minimal lift.

I've tried them all... Jeeps are still the best. (0||||0)
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post #14 of 14 Old 11-15-2019, 03:36 PM
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Put in new PCM. Codes p0300 and p2302 are gone for now.
Thank you very much folks.
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