Help needed with misfiring 2005 TJ

[WizMatik]

2005 Jeep wrangler TJ golden eagle misfire.

Hey guys I am new here, I have a 2005 Jeep Wrangler TJ golden eagle with under 100000km. I have had a terrible missfire issue that cause the car to put itself in limb mode whiles driving. The miss fire only happens once the car is in gear and moving. When not in gear and parked there is no missfire.
The issue started 3 month ago. Initially it would happen rarely and only last a few seconds. 3 month down the track the car is practically undrivable and will only drive in limb mode (no missfire in limb mode).
Yesterday I had the crank angle sensor replaced. The issue went away for under 24hr and came back exactly the same as before. Starts and iddles with no issues, She only missfires while driving. The missfire get so bad that the car puts herself in limb mode after a few seconds. In limb mode the car is rev limited at 2500k but has no missfire
I extracted the following error codes, p0300, p0688, p0122 and p0339.
Any help would be greatly appreciated

 

[mots]

Hi, I'd first concentrate on the last three codes, their common causes, and then see if the misfire (p0300) goes away after you get those solved.

If you look through those 3 (see symptoms and causes below), it looks to me like it probably is some sort of PCM/Wiring related issue. Make sure you are using OEM sensors when you replace them as cheap auto part stores ones typically don't work nearly as well and are known to throw codes in many cases.

You also have a 2005. If it is an automatic, the TCM is built into the PCM and is known to have issues. Someone more versed in this particular issue can chime in to help and see if any of your symptoms match. There is a lot of information on this site and elsewhere on this issue.

Perhaps others will have some ideas as well.

p0688
Symptoms may include:

• Delayed or no start
• Electrical accessories may be inoperative
• Engine drivability issues

Causes may include:

• Defective PCM power relay
• Blown fuse or fusible link
• Open or shorted circuit between the power relay and the PCM

p0122
Symptoms may include:

• Rough or low idle
• Very high idle
• Stalling Surging
• No/little acceleration

Causes may include:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer (PCM)

p0339
Symptoms may include:

• The engine will not start
• The tachometer (if equipped) does not register
• RPM when the engine is cranked
• Hesitation upon acceleration
• Poor engine performance
• Diminished fuel efficiency

Causes may include:

• Defective CKP sensor
• Open or shorted wiring to the CKP sensor
• Corroded or fluid soaked connector at the CKP sensor
• Faulty PCM or PCM programming error
  

 

[WizMatik]

Hi, I'd first concentrate on the last three codes, their common causes, and then see if the misfire (p0300) goes away after you get those solved.

If you look through those 3 (see symptoms and causes below), it looks to me like it probably is some sort of PCM/Wiring related issue. Make sure you are using OEM sensors when you replace them as cheap auto part stores ones typically don't work nearly as well and are known to throw codes in many cases.

You also have a 2005. If it is an automatic, the TCM is built into the PCM and is known to have issues. Someone more versed in this particular issue can chime in to help and see if any of your symptoms match. There is a lot of information on this site and elsewhere on this issue.

Perhaps others will have some ideas as well.

p0688
Symptoms may include:

• Delayed or no start
• Electrical accessories may be inoperative
• Engine drivability issues

Causes may include:

• Defective PCM power relay
• Blown fuse or fusible link
• Open or shorted circuit between the power relay and the PCM

p0122
Symptoms may include:

• Rough or low idle
• Very high idle
• Stalling Surging
• No/little acceleration

Causes may include:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer (PCM)

p0339
Symptoms may include:

• The engine will not start
• The tachometer (if equipped) does not register
• RPM when the engine is cranked
• Hesitation upon acceleration
• Poor engine performance
• Diminished fuel efficiency

Causes may include:

• Defective CKP sensor
• Open or shorted wiring to the CKP sensor
• Corroded or fluid soaked connector at the CKP sensor
• Faulty PCM or PCM programming error

Hi, I'd first concentrate on the last three codes, their common causes, and then see if the misfire (p0300) goes away after you get those solved.

If you look through those 3 (see symptoms and causes below), it looks to me like it probably is some sort of PCM/Wiring related issue. Make sure you are using OEM sensors when you replace them as cheap auto part stores ones typically don't work nearly as well and are known to throw codes in many cases.

You also have a 2005. If it is an automatic, the TCM is built into the PCM and is known to have issues. Someone more versed in this particular issue can chime in to help and see if any of your symptoms match. There is a lot of information on this site and elsewhere on this issue.

Perhaps others will have some ideas as well.

p0688
Symptoms may include:

• Delayed or no start
• Electrical accessories may be inoperative
• Engine drivability issues

Causes may include:

• Defective PCM power relay
• Blown fuse or fusible link
• Open or shorted circuit between the power relay and the PCM

p0122
Symptoms may include:

• Rough or low idle
• Very high idle
• Stalling Surging
• No/little acceleration

Causes may include:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer (PCM)

p0339
Symptoms may include:

• The engine will not start
• The tachometer (if equipped) does not register
• RPM when the engine is cranked
• Hesitation upon acceleration
• Poor engine performance
• Diminished fuel efficiency

Causes may include:

• Defective CKP sensor
• Open or shorted wiring to the CKP sensor
• Corroded or fluid soaked connector at the CKP sensor
• Faulty PCM or PCM programming error

Hi mots

Thank you I will look into the error codes and focus on last 3.
My TJ is a 6 speed manual, I had the Jeep worked on by a Jeep garage so hoping that the part are oem.

Cheers

 

[mots]

Excellent, I have an 05 manual as well

The other advice I would give, since it does seem to be some sort of Sensor/PCM/Wiring related issue is to check all the simple stuff related to your electrical system (battery, alternator, battery cables/alternator cable, proper grounds, no other obvious visible wiring issues etc.). Once that is done, clear the codes and see which ones come back and in what order. Sometimes that can be helpful in your troubleshooting. Perhaps all of them won't come back and you can concentrate on the ones that do.

 

[WizMatik]

Thanks mots, I will get to check the electrics, codes come in this order, p0688 comes back practically straight away, all other come back once the misfire start.

 

[mots]

Thanks mots, I will get to check the electrics, codes come in this order, p0688 comes back practically straight away, all other come back once the misfire start.

Yeah, the p0688 is an ugly code. Once you get that sorted, whatever electrical gremlin it is, then things should get better from there. The full text of where I pulled the info above can be found on this site. Here is the one for p0688.
https://www.obd-codes.com/p0688