SOURCE: 04 jeep grand cherokee 66000 miles 4.0
Run the car with the radiator cap off. Make sure the radiator is topped
off with coolant or water will do just fine. While the car is running
look in the radiator neck and check if there are bubbles coming out.
Maybe bad head gasket.
SOURCE: 04 jeep grand cherokee 66000 miles
If the codes are just not going away, they may need resetting so the ECU doesn't have them stored.
You may have a headgasket failure affecting those three adjacent cylinders.
That motor doesn't seem to have a chronic problem with this but it can happen anyhow.
Keep an eye on the oil and water to see if there is any sign of contamination in either and check those three plugs for signs of rust or other non-carbon deposits.
That 6-banger is one of the world's best engines and generally not a trouble-maker.
We have 4 of them in the family of different eras, and all have been good to us.
SOURCE: main catalyst efficiency below threshold bank 2 cherokee 2001
If the readings were close to passing, use 3oz of acetone per 10 gals of fuel and it should pass. Then you have a whole year to figure out what's wrong with it! Main cat is the large one. all others are pre-cats.
SOURCE: my 2001 jeep grand Cherokee will not start don?t
Timing Chain, Sprockets, Front Cover and Seal
REMOVAL & INSTALLATION
2.5L and 4.0L Engines
SOURCE: What else, Check Engine Light, P0505, p0135, p0155, p1494 codes?
You can not work on a vehicle as your doing
Your checking for generic codes only & throwing
parts at it
You get a couple possible worn or failed parts & have
a few less codes
There is no need to clear ALL Data every time you change a part
You need to STOP
You need professional scan tool software to look at ALL data & go for a road test first
You keep clearing stored data ,so now the process will take longer
You work one code & one system at a time
NO PARTS get replaced that are not tested & found to fail
a test,thus a worn out part.
You need both Factory Emission & Diagnostic Manual, as well
as Wiring Diagram Book-- BEFORE-- you can even walk to the vehicle (Helm.Com)
You have nothing to go by,no system knowledge & no trouble charts,& no wiring diagrams to start your testing
If you got no scan tool & no volt meter & no oscilloscope,
your done,vehicles have to be tested to find a problem,any
problem,resolve it & continue on.
Testimonial: "OK I have a volt meter, obd2 reader, craftsman wrenches and 33 years of experience of troubleshooting. I wanted to ask the auto brainiacs before I purchase a PCM or attempt the fuel filter/sensor in the tank. I appreciate your input and if I were 19 you might have convinced me to take it in for repair. However, for 85.00 an hour labor I can replace the IAC and TPS several times."
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