P0339 & P0300 codes

Tojeepornottojeep

Tojeepornottojeep

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Aug 12, 2021
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I have 2005 tj 4.0 auto keep getting codes p0339 & p0300

I have changed the camshaft and crankshaft sensor, full service change of plugs & oils etc, injector clean and currently have a ignition capacitor on order hoping that would be the weak link.

it runs smooth when start up and idling however it starts to buck and misfire at 2800rpm when warm. I’m literally getting to the point of being clueless of what to change or look for ! Anyone had this problem would appreciate any help
 
Tojeepornottojeep said:
I have 2005 tj 4.0 auto keep getting codes p0339 & p0300

I have changed the camshaft and crankshaft sensor, full service change of plugs & oils etc, injector clean and currently have a ignition capacitor on order hoping that would be the weak link.

it runs smooth when start up and idling however it starts to buck and misfire at 2800rpm when warm. I’m literally getting to the point of being clueless of what to change or look for ! Anyone had this problem would appreciate any help
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Since you have replaced those 2 sensors what brand did you install.
 
Tojeepornottojeep said:
Crowne was one of the sensors, can’t remember the crankshaft I tried to get moopar and seems impossible in the uk
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Using other then Mopar or NTK products for replacements can cause issues since the Cam and Crank sensors can be fussy.

RockAuto usually carries the Mopar/NTK products and they ship to the UK.

https://www.rockauto.com/
 
After installing cam and crank sensors you need to do a re-learn with a good scan tool. That's the procedure listed in the factory service manual, they do it for a reason. The "wives tale" about Mopar sensors is just because people are trying to get away with doing the job without the re-learn which is fine. Sometimes trying a few sensors is cheaper than finding a place to do the job right. Different sensors have different signal patterns so even if you get the thing back in the same position it wont be like your factory sensor was. Even a new factory sensor could be different, that's why re-learn is part of the deal.
 
Installing a Sensor only, 2005 FSM states:

(1) Install sensor (2) (Fig. 18) to oil pump drive housing (1).


(2) Install sensor mounting bolt (3) (Fig. 18) and tighten to 2 N·m (15 in. lbs.) torque.

(3) Connect CMP electrical jumper harness (3) (Fig. 19) to engine wiring harness.

That's it.

For a complete Oil Pump Drive and CMP assembly the last step is to "Relearn". However, you need a DRB Scan tool to do so. That's not your typical hand scanner. Used, they go for $3,000.00
 
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