Codigo p0300 jeep liberty 2006

Question

Hola buenas noches a todos tengo una jeep liberty 2006 él problema que tengo no le puedo encontrar la falla lla cambie coil nuevos bujías nuevas y le ise él tes del smok o sea un tes de likeo todo esta bien llano se q a ser y espero aguno de ustedes me puedan dar una idea cual seria él fallo lla lo lleve a un mecánico y no lo pudo arreglar y no puedo arreglar ese código p0300 jeep liberty 2006 dios los bendiga y ojala me puedar alludar o darme una idea cual puede ser él fallo

Answer 1

This is mechanical problem with the valve, Lets me show you a TSB that Jeep has for this,

SUBJECT:
Engine Misfire At Idle

OVERVIEW:
This bulletin involves installing revised intake valve locks and intake valves.

MODELS:

2005-2006 (KJ) Liberty/Cherokee (International Markets)
2005 - 2006 (ND) Dakota

NOTE :This bulletin applies to vehicles equipped with a 3.7L engine (sales code EKG).

SYMPTOM/CONDITION:

The customer may experience occasional engine misfire at idle (rough idle). The malfunction indicator lamp may illuminate for single or multiple cylinder misfire.

DIAGNOSIS:

1.	Place vehicle in park or neutral.
2.	Using a StarSCAN(R) or DRBIII(R), monitor which cylinder is misfiring. Cylinder # 3 is the most likely cylinder to have idle misfire, a cylinder on the opposite bank very very rarely may exhibit a misfire at idle.

NOTE :When monitoring which cylinder is misfiring, counts should be above 10 per minute.

3.	Record misfire counts for 1 minute.
4.	Rev engine up to 3500 to 4000 rpm and release, do not hold engine at elevated rpm let it come back down to idle.
5.	Monitor the cylinder misfire count for one minute. If the misfire rate does NOT reduce to less than 5 per minute then repeat Step # 4 and re-monitor up to ten times.
6.	If the misfire rate DOES reduce to less than 5 per minute, perform the Repair Procedure. If the misfire rate does NOT reduce to less than 5 per minute after repeating Step # 4 ten times this bulletin does not apply and further diagnosis is required.

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