What are the most common causes of P0300 - JeepForum.com
 
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post #1 of 8 Old 09-19-2017, 07:22 AM Thread Starter
danb303
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What are the most common causes of P0300

I drove my 06 LJ home from work (15 miles) yesterday. After about a 15 minute stop in town I re-started it and I could tell it wasn't hitting on all cylinders. I was less than a mile from home so I started home and the CEL started flashing. It flashed for less than a minute and then went off. The CEL stayed off after if quit flashing.

I had already bought the replacement OPDA so I went ahead and installed it. My old one had very little wear on the gear and a little play, though not much. I drove it around a few minutes after the swap and it was fine

I have 75k miles on the Jeep now. Any chance the ODPA will fix the issue?

The first thing I thought was heat soak. Although, I've driven it all summer with no issues and it was only 91 degrees here yesterday.


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post #2 of 8 Old 09-19-2017, 07:49 AM
NotURMailman
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Sounds like heat soak issue to me. Mine does it randomly and there doesn't seem to be any logical reason as to if it will do it or not.


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post #3 of 8 Old 09-19-2017, 07:59 AM
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Originally Posted by danb303 View Post
I drove my 06 LJ home from work (15 miles) yesterday. After about a 15 minute stop in town I re-started it and I could tell it wasn't hitting on all cylinders. I was less than a mile from home so I started home and the CEL started flashing. It flashed for less than a minute and then went off. The CEL stayed off after if quit flashing.

I had already bought the replacement OPDA so I went ahead and installed it. My old one had very little wear on the gear and a little play, though not much. I drove it around a few minutes after the swap and it was fine

I have 75k miles on the Jeep now. Any chance the ODPA will fix the issue?

The first thing I thought was heat soak. Although, I've driven it all summer with no issues and it was only 91 degrees here yesterday.
Did you buy an OEM or aftermarket OPDA? Also did you use the OEM sensor? The reason I ask is I replaced mine with the Crown OPDA at 72k mi and used a new OEM cam position sensor instead of the one that came on it. Had no problems for a month then the CEL came on and it started throwing random codes, shifting hard and extended cranking starts in the morning. Turns out the sensor was too close to the rotor so I added a small washer to the mounting bolt between the sensor mount and the OPDA case and this increased the gap between the sensor and rotor. Been running fine for a month now. Might be worth trying.

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post #4 of 8 Old 09-19-2017, 08:18 AM Thread Starter
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I used the Crown OPDA and the factory sensor.

My issues were before the OPDA change.

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post #5 of 8 Old 09-19-2017, 08:30 AM
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Quote:
Originally Posted by danb303 View Post
I drove my 06 LJ home from work (15 miles) yesterday. After about a 15 minute stop in town I re-started it and I could tell it wasn't hitting on all cylinders. I was less than a mile from home so I started home and the CEL started flashing. It flashed for less than a minute and then went off. The CEL stayed off after if quit flashing.

I had already bought the replacement OPDA so I went ahead and installed it. My old one had very little wear on the gear and a little play, though not much. I drove it around a few minutes after the swap and it was fine

I have 75k miles on the Jeep now. Any chance the ODPA will fix the issue?

The first thing I thought was heat soak. Although, I've driven it all summer with no issues and it was only 91 degrees here yesterday.
Heat soak typically represents as a rough stumbling idle that starts to clear up and improve as the air intake temperature drops. It will typically be normal or nearly back to normal before you get out of most parking lots after a hot start and rarely will there be a CEL.

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post #6 of 8 Old 09-19-2017, 08:36 AM Thread Starter
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When I started the jeep it was obvious that it wasn't running on all cylinders. I drove about 200 yards and the CEL started flashing. It ran like that until I got home (less than a mile). After changing clothes, BS-ing with my wife and opening my shop up, I started it up to pull in the shop and everything was fine.

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post #7 of 8 Old 09-19-2017, 08:41 AM
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Originally Posted by danb303 View Post
I used the Crown OPDA and the factory sensor.

My issues were before the OPDA change.
Well I like the crown unit on mine. I hope your issue is something small and cheap and not a bad PCM like many '05 & '06 models. Definitely keep an eye on it and if it starts throwing random codes after you have fixed one then start looking at the PCM.

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post #8 of 8 Old 09-19-2017, 08:44 AM
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Originally Posted by mrblaine View Post
Heat soak typically represents as a rough stumbling idle that starts to clear up and improve as the air intake temperature drops. It will typically be normal or nearly back to normal before you get out of most parking lots after a hot start and rarely will there be a CEL.
Could this be why mine starts idling rough in standing traffic on hot days?

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