rob_engineer

Was the K&N dripping with oil when you installed it?

Mad Dog 21

No the filter just smelt like it. Oh and yes I got two codes P0172 and P0175. Too rich is the problem. So spark plugs and coil packs. What are the best to get?

TheEngineer13

Start with the spark plugs, it's less likely that the coil packs went bad. Your local parts store will be able to direct you to the proper OEM spec plugs.

Mad Dog 21

Ok I will thanks again.

ronjenx

There is no MAF sensor for the JK 3.8L engine.

Here is some info for the codes you have:

P0172-FUEL SYSTEM 1/1 RICH
P0175-FUEL SYSTEM 2/1 RICH

Theory of Operation


The fuel feedback system will maintain a stoiciometric fuel/air mixture, 14.7:1, by modifying the injector pulsewidth according to the oxygen content of the exhaust gas. The PCM makes short term and long term fuel corrections to maintain stoiciometric fuel/air ratio for best catalytic converter efficiency. Short term fuel correction is based on upstream O2 sensor output and is designed for quick engine response. The long term fuel correction compensated for variations in the engine specifications, sensor tolerances and component aging and is designed to correct rich and lean conditions over a longer period of time.

• When Monitored: With the engine running in closed loop mode, the ambient/battery temperature above -6.7°C (20°F) and altitude below 2590.8 m (8500 ft).
• Set Condition: If the PCM multiplies short term compensation by long term adaptive and a purge fuel multiplier and the result is below a certain value for 30 seconds over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.

[TABLE]
[TR]
[TD="bgcolor: white, align: center"]Possible Causes
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 SENSOR HEATER OPERATION
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]EVAP PURGE SOLENOID OPERATION
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 SIGNAL CIRCUIT
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 RETURN CIRCUIT
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]O2 SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]MAP SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]ECT SENSOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]ENGINE MECHANICAL:
AIR INDUCTION SYSTEM - must be free from restrictions.
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
FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]FUEL FILTER/PRESSURE REGULATOR
[/TD]
[/TR]
[TR]
[TD="bgcolor: white, align: left"]POWERTRAIN CONTROL MODULE (PCM)

[/TD]
[/TR]
[/TABLE]

Mad Dog 21

Yes I did look those components over yesterday. I also disconnected the MAP while it was idling. Turn it off then back on. Now it idles like normal at 600-700rpm. I plan on replacing the spark plus, wires, and MAP. Is there anything else that I'm missing?