Question about 1997 Jeep Cherokee Country

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P320 am getting a p0320 code and a p1391, has been acting like someone pulled the plug or fuel , at high speeds, rpm jumps up, and then it goes on smoothly for a lil bit. just now got ck engine light on, and getting worse. pulled in to auto zone and those are the codes it gave. already did tune up "replacing wires,plugs, oile change, ...

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What engine?

P0320 and P1391 are crank sensor codes. The symptoms you have certainly point towards one possibly going bad.

if this is a 4.0 straight six you can find the crank sensor on the drivers side of the transmission where it blots up to the engine on the top side. If you look in between the intake and the firewall you should be able to locate the harness and follow it to the sensor. The sensors are relatively inexpensive and would be an excellent start.

Posted on Feb 16, 2012

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Posted on Jan 02, 2017

  • 1757 Answers

SOURCE: P0320 & P1391 OBD codes displayed.

P 0320 = No Crank Reference Signal to PCM. No Crank (shaft position) reference signal detected during engine cranking (starting).
P 1391 =Intermittent Loss of either Camshaft Position Sensor or Crankshaft Position Sensor.
Hav you attemtped the "3-Key-Ons" method to see these codes on your digital Odometer (assuming you have one) Turn the Key from Off to On (not start) three (3) times. On the third (3rd) time leave the Key in the "On" position (not start). Look at your Dogotal Odometer (if so equipped). The Codes, one at a time should appear. The Last Code will be "P donE".
If te engine is performing without problems: disconnect the negative side of the Battery and wait at least 5 to 30 minutes. Reconnect the Battery. Re-preform the 3-Key-On's and see if and Codes are now showing.
If you start having Start or Running problems becoming more and more frequent: consider replacing the Crankshaft Position Sensor. If this sensor "fails" you may not get any fire to anything, as this is the signal that is necessary for the PCM to initiate the Firing Sequence. The PCM will not send a signal to even the Ignition Coil to begin.

Posted on Jan 08, 2010

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DTC CODES P0300 to P0399

P0300....Random/Multiple Cylinder Misfire Detected

P0301....Cylinder 1 Misfire Detected

P0302....Cylinder 2 Misfire Detected

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

P0305....Cylinder 5 Misfire Detected

P0306....Cylinder 6 Misfire Detected

P0307....Cylinder 7 Misfire Detected

P0308....Cylinder 8 Misfire Detected

P0309....Cylinder 9 Misfire Detected

P0310....Cylinder 10....Misfire Detected

P0311....Cylinder 11 Misfire Detected

P0312....Cylinder 12 Misfire Detected

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P0328....Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329....Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330....Knock Sensor 2 Circuit (Bank 2)

P0331....Knock Sensor 2 Circuit Range/Performance (Bank 2)

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P0333....Knock Sensor 2 Circuit High Input (Bank 2)

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