Problem Description and Possible Solution
An engine misfire at idle (rough idle), accompanied by illumination or flashing of the Check Engine Light, could indicate a problem with one or more of the intake valves. Revised intake valves & valve locks are available to address this concern.
Problem DataRepairPal Verified
Average mileage: 106,347 (12,100–247,000)
Engines affected: 2.4L 4 Cylinder, 2.8L Diesel, 3.7L V6
11 model years affected: 2002
, more2006, 2007, 2008, 2009, 2010, 2011, 2012
134 people reported this problem
After flushing the radiator, my 2002 jeep liberty engine light came on. misfire. cyl 2,3 and 6. my o2 sensor is bad too. i change all spark plugs and ignition coil for cyl 6. nothing seems to work. When i start the car the engine light starts to flash and engine knocks. help please!
Jeep suddenly would not start unless you aggressively apply the accelerator and maintain above 1500 RPM, it would not idle, and reported a P0306 diagnostic code (Cylinder 6 misfire). FYI the last digit is the cylinder # so you may see a different P030X. I replace the spark plugs and Ignition coils when first trying to diagnose this problem, until I found this website and people described the Intake valve problem. Borrowed a compression tester from a friend and found NO COMPRESSION on cylinder 6!!
If you are experiencing a similar problem save yourself $150 and do a compression test!
Like this comment if I saved you a buck!
At around 90,000 miles my engine light went on and began flashing and the engine would roughly idle. If I turn the engine on and off, it becomes driveable. I took it to the mechanic and he said it was my #2 cyl and that coolant was leaking into the cylinder. ...about a 2,0000.00 job for a both heads, gasket, labor, machining, etc. He told me that this problem, along with the transmission (clunking in rearend) is "common". When I spoke to a Jeep rep online, I was told that their only recall was for the airbag deployment; I find that interesting because I am not the only one to have this cyl problem. Jeep needs to recognize this "common" problem.
Check engine light on. Extreme shaking when idling. Fine once it gets going.
Misfire cyc 4 and random cyc misfires, changed coil packs and plugs... sounds as if rod going to come through engine... I now have a payment and no car to drive... when is jeep going to be held responsible for numerous reports of this with their 3.7L engines...
I've changed the apark plugs, the coils, had the unjectors flushed and my check engine light remains on and blinks occasionally.
The OBD codes indicate misfiring issues with the 2nd, 4th, and 6th cylinders, but I'm leaning towards an issue with the intale valves!
The most frustrating part of this is the fact that I've taken it to the dealership three times in the past three months and they have yet to fix the problem, but they still charge me an arm and a leg for their so-called "repairs"!
I've never had any problems with my Liberty until recently, so we're taking it in to a local repair shop this afternoon. I'll provide an update as soon as I know what the REAL problem is!
It has a misfire in the number six cylinder and has trouble starting and driving as well. It has a bad vibration when pressing the throttle at 50 mph and above.
MY 2006 JEEP LIBERTY HAD ALL THE CLASSIC "RANDOM MISSFIRE" TROUBLE CODES. iTOOK IT TO THE JEEP DEALER AND THEY TOLD ME THE STANDARD TSB STORY ABOUT INTAKE VALVES AND RECOMMENDED A VALVE JOB AT AN EXSTIMATED COST OF $2800. I ELECTED TO DO THE VALVE JOB MYSELF, WITH A PROFESSIONAL MACHINE SHOP PERFORMING THE MACHINE WORK. I PURCHASED ALL NEW INTAKE VALVES AND KEEPERS FROM JEEP AND PUT IT ALL BACK TOGETHER AND I STILL HAD THE THE EXACT SAME MISSFIRE. AFTER SOME FURTHER RESEARCH I DECIDED THAT THE PROBLEM APPEARED TO BE A PROBLEM WITH THE OXYGEN SENSORS, BECAUSE THE OXYGEN SENSORS DID NOT BECOME ACTIVE UNTIL THEY REACHED 600 DEGREES, WHICH SEEMED TO CORRESPOND WITH THE MISS DISSAPEARING AFTER ABOUT 30-60 SECONDS AFTER STARTUP. I REPLACED BOTH PRIMARY O2 SENSORS, AND THE MISS IS GONE. I RECOMMEND THAT ANYONE WHO HAS THIS PROBLEM PERFORM A COMPRESSION TEST, AND IF ALL CYLINDERS ARE OK, THEN REPLACE THE O2 SENSORS. GOOD LUCK, AND DON'T BELEIVE ALL THE EXPERTS THAT ARE IN A POSITION TO PROFIT FROM YOUR PROBLEM.
0306 code constantly no matter what you do.
Always triggered while idling. Compression test good, leak down test good, new plugs, coils, injectors, cleaned throttle, O2 sensors all four, check valves no vacuum leaks. Cur runs normally but nothing fixes codes.
Check engine light came on (misfire on cylinder 4) - spark plugs replaced. Light came on again (misfire on cylinder 4) - switched coil from 4 to 2. Light came on again (misfire on cylinder 4) - found out today that every valve on the right side of the engine is burnt. The story from the mechanic it is that due to some carbon build up and it has caused the valve guides to go bad. He also stated that not driving it enough can be a cause for the carbon build up. He also found that one of the timing chain guides had broken . . on the right side. Coincidence? So, $3100 later it is time to say goodbye to the Liberty
Found zero compression on cylinder #6 after finding the 0306 code. So far no solution
Car shook when changing from 2nd to third gear or into overdrive.....not sure which. Code indicated a misfire in the #2 cylinder. Am taking it to a mechanic today to have it checked. When engine is first turned on sounds fantastic. I disengaged the overdrive and drove it home in second gear....very slowly (30 mph)....ran like a top...From all I have read, I am scared to death that this could be anything from a spark plug to massive damage......I think it has 145,000 miles.
Vehicle stalled, would start but die at idle. towed to Repair shop where found #5 intake valve keeper missing, broken valve spring and damaged valve. Valve guidein the head was cracked(no longer able to get a replacement guide from Jeep). Had to replace left cylinder head and valves. Replaced intake valves and valve locks on right cylinder head (a kit sold by Jeep to fix this problem)as per Jeep Service Bulletin TSB 09-007-06. Although we had this vehicle in to Chrysler on more than one occasion both for engine light illumination and rough idle, no one ever alerted us to this service bulletin and the fact that there was a kit to prevent the resulting $2300.00 repair.
I purchased a 2005 Jeep Liberty Sport on 12/9/10. Within 100 miles after driving it off the dealer's lot, the check engine light came on. The dealer has had it in for repairs on 4 different occasions for a total of 37 days in three different repair shops. I have only owned the vehicle 71 days and it's spent 37 days in repair shops! They have put in 6 new spark plugs, a new serpentine belt tensioner, performed a two part valve and induction system cleaning, installed a new water pump and finally did a valve job on it. They just completed installation of 12 new valves and keepers. Thankfully all this work was performed under warranty. I'm picking my Jeep up from the dealership today (after 26 days in the repair shop) and I'm praying that the check engine light stays OFF!!!
Check engine light comes on when idle. Reports misfire. I have had my engine repaired, both head gaskets, all
plugs & wires, all fluids, coils.When I purchased the tire light came on, they changed all tire sensors, still came on, they replaced the whole sensor hub.
Chrysler has acknowledged a problem with piston #5 sticking during idle. Don't use any type of additive that is of a solvent base ( like most injector cleaners)as this will just make the problem worse!
my engine light came on and went to get an oil change and they told me it was my sparkplugs so they were changed and the engine light still on so took it again to another dealer they did an compression check on it and said likely it is the valve #5 or maybe more and that these Jeep liberty with the 3.7 motor are known for this that he had over 12 come in but was not aware of a recall this cost 80.00 dollars for the check,the windows all 4 of them would not work were broken just from shutting the door Chrysler did help with these although they say my paticular vin # number was not in the recall for these they had me pay 100.00 dollar for a co-pay and what I do not understand even if I was the 3rd owner what difference does that make if my car has recalls to cover it or not I am the owner of this vehicle so many problems with the Jeep I live in the mountains and thought this car would last me but finding out it has multiple problems and Jeep will not help me on the situation at hand I wonder why the lemon law has not been put in place for these. Their also recall for the rear suspension lower control arms had those done as well is their anyone that can help or are we just stuck with an non-operable vehicle. I know I dont have the money to put the car in the shop.
Jeep was idoling very rough.. Stalled while I was going in reverse.. Than following day just didn't start or wouldn't stay running heard knocking noise! Told it is a valve that came out of sleeve.. 2100.. I'm reading up on all jeep I can't believe jeep has not recalled these engines... Never again will I buy a jeep or anything American!
I reported my valve lock problem previously, this is just to say that I took Chrysler Canada, cause that is where I bought the car, to small claims court and got back half of the cost of the repairs.
rough idle, coils replaced and tune up done 3xs problem still exists.