Help! Random Misfire, Rough Idle, Surging - JeepForum.com
 
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post #1 of 6 Old 05-26-2016, 04:16 PM Thread Starter
carlthomasr
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Help! Random Misfire, Rough Idle, Surging

Hi All,

2009 Unlimited X, 3.8 4x4 automatic. Hoping someone can point me in a good direction. Getting P0300, P0132, P0032 codes. Symptoms include rough idle and engine surging. Doesn't seem to have any power or acceleration issues, once past the initial sputtering. My mechanic has ruled out fuel pressure and catalytic. He said the 132 code should clear out after running for a few miles. He replaced the coil, pcv, map sensor, and crank sensor. He cleaned the throttle body. Got it back and still getting same symptoms and codes. Does anybody have any ideas?

Thanks in advance!

Tom

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post #2 of 6 Old 05-26-2016, 05:20 PM
b16a2sir
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plugs and wires? My 2010 did that when I changed the plugs. Then I changed the wires and all OK.
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post #3 of 6 Old 05-26-2016, 10:31 PM
ronjenx
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O2 sensor 1/1 is the upper sensor on the right side of the engine.

P0032 is the O2 sensor 1/1 heater circuit, and P0132 is the O2 sensor 1/1 sensing circuit. These codes have a lot in common. The two circuits can be troubleshot with a meter, but some tests require the dealer's scan tool.

P0300 is the dreaded multiple cylinder misfire code. It has a long list of possible causes. Anything that affects the speed of the crankshaft can set this code, so it's not necessarily actual misfires in the cylinders.

It takes 1 soft fail to set a malfunction and two trips to set the MIL. Three good trips to turn off the MIL.

Here is a list of things to check before money is spent on parts:

ASD RELAY OUTPUT CIRCUIT
INJECTOR CONTROL CIRCUIT
COIL CONTROL CIRCUIT
IGNITION WIRE
SPARK PLUG
IGNITION COIL
FUEL PUMP INLET STRAINER PLUGGED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP MODULE
FUEL PRESSURE LEAK DOWN
FUEL INJECTOR
ENGINE MECHANICAL
POWERTRAIN CONTROL MODULE (PCM)



VISUAL INSPECTION
NOTE: Anything that affects the speed of the crankshaft can cause a misfire DTC.
NOTE: When a Misfire is detected for a particular cylinder, the PCM will shut down that cylinder's Injector Control circuit.
Turn the ignition off.
- Visually inspect the engine for any of the following conditions.
- Worn serpentine belt
- Binding Engine-Driven accessories: A/C Compressor, P/S Pump, Water pump.
- Misalignment of the Water pump, P/S Pump and A/C Compressor pulleys
- Corroded PCM power and ground circuits.
- Improper CKP, CMP, MAP, and TP Sensor mounting
- Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector, Ignition coil, etc.
- Vacuum leaks
- Restricted Air Induction system or Exhaust system.
- Internal engine component failures.



SPARK PLUGS
Turn the ignition off.
Remove the Spark Plugs.
Inspect the Spark Plugs for the following conditions.
- Cracks
- Carbon Tracking
- Foreign Material
- Gap size out of specifications
- Loose or broken electrode

NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move.

ENGINE MECHANICAL
Check for any of the following conditions/mechanical problems.
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
CAM LOBES - must not be worn excessively
CYLINDER LEAKAGE TEST - must be within specifications
VALVE SPRINGS - cannot be weak or broken


POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensor, Coil, Injector, and the Powertrain Control Module (PCM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors, Coils, Injectors, and the Powertrain Control Module connectors.
Refer to any Technical Service Bulletins that may apply.

2008 JKU Rubicon
42RLE Auto
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post #4 of 6 Old 06-02-2016, 06:51 PM
BlackJack812
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Believe it or not I got the same codes for a bad vacuum line..replaced line...boom no codes, runs like a champ.

BlackJack Forge, Columbus, IN 8122236167
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post #5 of 6 Old 02-22-2018, 05:38 PM
WATERMAN31
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Location: Egg Harbor Township, NJ
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[QUOTE=ronjenx;35356609]O2 sensor 1/1 is the upper sensor on the right side of the engine.

P0032 is the O2 sensor 1/1 heater circuit, and P0132 is the O2 sensor 1/1 sensing circuit. These codes have a lot in common. The two circuits can be troubleshot with a meter, but some tests require the dealer's scan tool.

ronjenx, when you say the 02 sensor is the upper right side of the engine, do you mean drivers side or passengers side?

Time Flies when your having Rum!
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post #6 of 6 Old 02-22-2018, 07:21 PM
ronjenx
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Quote:
Originally Posted by WATERMAN31 View Post

ronjenx, when you say the 02 sensor is the upper right side of the engine, do you mean drivers side or passengers side?
I mean the right side of the engine. Same side as the right front door.

Can't say driver/passenger side because not all drivers are on the same side.

2008 JKU Rubicon
42RLE Auto
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