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  #13  
Old 12-16-2010, 09:16 PM
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Re: My Jeep is throwing a code and I need some help

Damn thats lame that its most likely the sensor again within a couple of months
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  #14  
Old 12-21-2010, 10:25 AM
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Well guys it looks like my problems are gettin worse so I'm going to need to some help figuring out these codes:

P0122
P0351
P0300
P0301
P0306

From what I can gather, p0300-306 are cylinder misfires. 351 seems to be something with the ignition coil and 122 is the TPS. Does anybody know exactly what needs to be replaced and the range of costs?
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Old 12-21-2010, 10:26 AM
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Re: My Jeep is throwing a code and I need some help

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  #16  
Old 12-21-2010, 10:37 AM
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Re: My Jeep is throwing a code and I need some help

^^^Now that ain't right!!! LMFAO
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  #17  
Old 12-21-2010, 01:11 PM
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Re: My Jeep is throwing a code and I need some help

there is a tsb for the misfire

Vehicle: Customer Interest
Engine - Multiple Cylinder Misfire
NUMBER: 09-003-03
GROUP: Engine
DATE: Aug. 01, 2003
SUBJECT:
4.0L Multiple Cylinder Misfire
OVERVIEW:
This bulletin involves inspection of all engine exhaust valves and a decarbonizing procedure if necessary.
MODELS:
1999 - 2004 (WJ) Grand Cherokee (All Markets)
2001 - 2004 (WG) Grand Cherokee (International Markets)
1999 - 2004 (TJ) Wrangler
1999 - 2001 (XJ) Cherokee
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 4.0L ENGINE (SALES CODE = ERH).
SYMPTOM/CONDITION:
The customer may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the
vehicle is operated between 80 - 112 KPH (50 - 70 MPH) and under light loading conditions, e.g. slight uphill road grades. This condition may
occur at all ambient conditions, but is more noticeable when ambient conditions are less than 0C (32F).
If the vehicle is equipped with On-Board Diagnostic (OBD), a MIL illumination may also have occurred due to Diagnostic Trouble Code
(DTC) P0300 - Multiple Cylinder Misfire. Various single cylinder misfire DTC's may also be present. If the frequency of misfire is high the
Powertrain Control Module (PCM) may place the engine in "Limp-In" mode.
The misfire condition may be caused by one or more engine exhaust valves that are slow to close. Late closure of an exhaust valve may be the
result of no valve rotation and associated build up of carbon on the exhaust valve stem.
DIAGNOSIS:
1. This condition may occur when the engine is not allowed to run at engine RPM's that are greater than 3,200 RPM. At 3,200 RPM or
higher the engine exhaust valves will rotate if not impeded by high carbon deposits. Low engine RPM's and high carbon deposits are
associated with short trip driving where the vehicle engine is not allowed to fully warm to normal engine operating temperatures. Cold
ambient temperatures will increase engine warm-up time and add to the opportunity of carbon deposit build-up on the stem of the
engine exhaust valve.
2. Verify that an engine misfire condition is present. Use of the DRBIII(R) during a road test, or a Co-Pilot data recording, may help to
determine engine misfire and misfire counts. If carbon deposit accumulation is severe, then a cylinder leak down test may detect one or
more cylinders leaking greater than 15%. Save any misfire DTC Freeze Frame Data that was stored for later misfire correction
verification.
3. Verify that the engine misfire condition is not caused by faulty engine mechanical or electrical components.
4. If the engine mechanical and electrical systems are operating properly perform the Repair Procedure.
2003 Jeep Truck Grand Cherokee 2WD L6-4.0L VIN S Copyright 2006, ALLDATA 8.80 Page 2
PARTS REQUIRED:
EQUIPMENT REQUIRED:
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
FAILURE




Vehicle: Customer Interest
Repair Procedure
INSPECTION:
1. Raise vehicle hood.
2. Remove the engine valve cover and all six exhaust valve rocker arms (the intake rocker arms are also removed during this step). Refer to
the appropriate vehicle Service Manual for detailed removal instructions. The valve cover gasket is reuseable. Keep each pair of rocker
arms matched to their respective valve and cylinder.
3. Inspect the end, or tip, of each exhaust valve stem where it makes contact with the respective rocker arm.
4. Determine if each exhaust valve is rotating within its respective valve guide. An exhaust valve that is rotating will have a "bulls eye" or
circular wear pattern on the face of the valve stem tip. If the exhaust valve is not rotating a straight mark-like pattern will be present
across the face of the valve stem tip.
5. If there are exhaust valves which are not rotating then proceed to the VALVE ROTATION section of this Repair Procedure.
6. If all exhaust valves are rotating, then this bulletin does not apply and further diagnosis is required. Install the engine rocker arms and
valve cover. Refer to the appropriate vehicle Service Manual for detailed installation instructions.
VALVE ROTATION:
1. If one or more engine exhaust valves are not rotating, perform the valve rotation procedure to all six (6) exhaust valves.
NOTE:
IT IS IMPORTANT THAT THE VALVE ROTATION SECTION OF THIS REPAIR PROCEDURE BE PERFORMED.
2. Clean and mark the tip of each exhaust valve stem with a paint marker. The paint mark will be used later to assist with determining if
the exhaust valve has been rotated 90.
3. Bring number one ( # 1) cylinder piston to top dead center using the mark on the crankshaft front dampener/pulley. This step is
important to prevent the possibility of the exhaust valve from falling completely into the cylinder.
4. Install the essential service tool valve spring compressor, MD-998772A, to the # 1 cylinder exhaust valve spring.
NOTE:
THE FOLLOWING VALVE ROTATION PROCEDURE WAS DEVELOPED WITH THE USE OF VALVE SPRING COMPRESSOR
TOOL MD-998772A. THE MD-998772A IS AN ESSENTIAL SERVICE TOOL AND PART OF THE DEALERSHIP REQUIRED
TOOLS. THE MD-998772A COMPRESSOR ENGAGES THE ENTIRE PERIMETER OF THE VALVE SPRING RETAINER, UNLIKE
OTHER MAKE VALVE SPRING COMPRESSORS.
5. Compress the # 1 cylinder exhaust valve spring enough to gain access so that the exhaust valve can be rotated 90. Rotate the exhaust
valve 90. Slowly remove the compression on the exhaust valve spring. Verify that the valve keeper is properly seated to the valve stem
and valve spring retainer.
6. The 4.0L firing order is 1 - 5 - 3 - 6 - 2 - 4. Without rotating the engine crankshaft repeat steps 3 through 5 to cylinder # 6.
7. Rotate the engine crankshaft 1200 and repeat steps 3 through 5 to cylinders # 5 and # 2.
8. Rotate the engine crankshaft another 1200 and repeat steps 3 through 5 to cylinders # 3 and # 4.
9. Install all cylinder rocker arms (intake and exhausts) and retaining bridge. Make certain that the push rods are properly seated to their
respective rocker arm and lifter. Tighten the respective cylinder bridge/rocker arm cap screws to 30 Nm (21 ft. lbs.) when each cylinder
piston is at top dead center (cylinder intake and exhaust valves are closed).
10. Install the engine cylinder head valve cover. Tighten the valve cover bolts to 10 Nm (85 in. lbs.). Refer to the appropriate vehicle
Service Manual for detailed assembly instructions.

I would try the procedure below first


DECARBONING COMBUSTION CHAMBER AND VALVES:
2003 Jeep Truck Grand Cherokee 2WD L6-4.0L VIN S Copyright 2006, ALLDATA 8.80 Page 2
1. Start the vehicle engine and allow the engine to reach normal operating temperature.
2. Remove the air tube from the engine throttle body.
3. With the engine at idle, spray the entire contents of Mopar Combustion Chamber Cleaner, p/n 04318001AB, directly into the throttle
body. As the cleaner is being ingested, allow the vehicle to "load up" with the cleaner to the point that the engine is almost stalling out.
Maintain this condition until all of the cleaner is used/ingested.
4. Stop the engine once the entire can of cleaner has been ingested.
5. Install the air tube to the throttle body.
6. With the hood closed and the vehicle parked inside the garage, allow the vehicle engine to heat soak for two to three hours. This will
ensure that the engine will maintain its temperature and will allow proper solvent penetration.
7. After engine soak, start the engine and drive the vehicle until the engine is has reached normal engine operating temperatures.
8. If the vehicle is equipped with an automatic transmission, place the gear selector into "L" (low). If the vehicle is equipped with a manual
transmission, place the transmission into first gear.
9. In a safe vehicle operating location that will allow the vehicle to be driven safely and at the posted speed limit, accelerate the vehicle
until the engine reaches 4500 RPM.
10. Hold the engine speed at this RPM for 15 seconds.
11. Slow down and in a safe location pull to the side of the road. Allow the engine to idle for five seconds.
12. Repeat steps 9 through 11 five more times.
13. With the vehicle at operating temperature and using any available Freeze Frame data recorded when the misfire DTC occurred, verify
that the misfire condition has been corrected.
14. Erase any engine DTC's once the misfire condition has been corrected.
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  #18  
Old 12-21-2010, 01:13 PM
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Re: My Jeep is throwing a code and I need some help

The TP sensor is probably a separate issue. If that code came back, then there is a circuit malfunction. it can also be e computer problem. You would need to see the TP signal to see. There can also be condensation building on the spark plug boots. Check those.
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  #19  
Old 12-21-2010, 04:16 PM
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Re: My Jeep is throwing a code and I need some help

Quote:
Originally Posted by Robert Palmer View Post




Believe me if I could afford it, I would get a different ride.

Scott thanks for the info, that looks too involved for my liking so Im just gonna send it to a shop and see what they say. I hate Jeep repairs One question though, that info seems to cover P0300-P0306 but what about P0351?
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  #20  
Old 12-22-2010, 02:02 PM
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Re: My Jeep is throwing a code and I need some help

Alright got it checked out and replaced a coil rail/ pack whatever you call it. I bought another TPS but the problem arose again so I ordered a new TPS harness from the dealer which will take a couple days.
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  #21  
Old 12-22-2010, 04:06 PM
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Re: My Jeep is throwing a code and I need some help

This is after the fact but usually if a CEL for a misfire AND a coil show up, the coil is the source of the misfire. I dont remember if the later model 4.0s are Coil on Plug or whatever like the 4.7s are.
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  #22  
Old 01-06-2011, 05:31 AM
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Re: My Jeep is throwing a code and I need some help

The 04 is coil on plug. Just got the same code tonight. Guess I'll be making a trip to the parts store tomorrow. Thanks for all the info. Made it easy to find and I didn't have to ask any questions.
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  #23  
Old 01-06-2011, 06:13 AM
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Re: My Jeep is throwing a code and I need some help

This is a stretch.... wranglers have a problem with their clocksprings causing a tps concern, something about shorting out and backfeeding voltage to the tps. For the longest time I had only heard about this on the wranglers (with the 4.0). but about a month ago we had a cherokee in that was doing it. I am assuming if it can do it across makes I would give it a shot. If its a hard failure, disconnect your clockspring and see if it come back.
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