Question about 2002 Jeep Liberty

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Cylinder #3 on my 3.7 liter V6 liberty is knocking lightly. how can I fix this?

Should I repair or buy another engine?

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  • Expert
  • 241 Answers

Check first coil pack for #3 if it is within the specified resistance range.
and
if you think which one more cheaper, repair or buy an engine.

Posted on Feb 22, 2012

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

ZJLimited
  • 17970 Answers

SOURCE: 2002 jeep liberty 3.7 liter 6 cylinder 4x4 spark

Make: JEEP
Model: LIBERTY - SPORT
Year: 2002
Engine: V6 - 3.7L - FI - - GAS

Part Number RC9MC4 .044" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope helps (remember to rated and comment this).

Posted on Sep 12, 2010

SOURCE: 2002 liberty 3.7 liter. I have replaced the coil,

If you have Coil- on -Plug you haven't found the bad one yet

Your not always going to get a code that is correct
e.g.PO304,PO305 etc

I would buy the injector from you, as I'm sure that wasn't it,
unless you have an air leak around it

You want no vacuum leaks,a near new EGR Valve,no
air induction tubing leaks

Clean the MAF Sensor with CRC MAF Cleaner

Clean Throttle Plate--CRC Throttle Body Cleaner

You did put anti-sieze on those spark plugs, if not
do so.

How old are the O2 Sensors
More than 80,000 mile,replace the front 2 with OEM
Specific Make--Bosch or NGK etc and not some
cut & splice universal type

Posted on Feb 01, 2011

daltonp
  • 361 Answers

SOURCE: 2004 Jeep Liberty 3.7 liter 4 cylinder.clicking,tapping,wont cran

Does sound like it has blown up

Posted on Apr 18, 2010

ZJLimited
  • 17970 Answers

SOURCE: 2004 - JEEP LIBERTY SPORT

P0122 Code - Throttle Position Sensor/Switch A Circuit Low Input

A P0122 code means that the the car's computer has detected that the TPS (throttle position sensor) is reporting too low a voltage. On some vehicles that lower limit is 0.17 - 0.20 volts (V).

Did you adjust it when you installed it? If the signal value is less than .17V then the PCM sets this code. Could be an open or a short to ground in the signal circuit. Or you may have lost the 5Volt reference voltage.

Symptoms may include:
* Rough or low idle
* Stalling
* Surging
* No/little acceleration
* other symptoms may also be present

Causes: A code P0122 may mean that one or more of the following has happened:
* TPS not mounted securely
* TPS circuit short to ground or another wire
* Faulty TPS
* Damaged computer (PCM)

Possible Solutions: Some recommended troubleshooting and repair steps are:
* Carefully check the throttle position sensor (TPS), wiring connector, and wiring for breaks, etc. Repair or replace as necessary
* Check the voltage at the TPS (refer to a service manual for your vehicle for specific information). If the voltage is too low that is indicative of a problem. Replace if necessary.
* If recently replaced the TPS may need to be adjusted. On some vehicles the installation instructions call for the TPS to be properly aligned or adjusted, consult a repair manual for specifics.
* If there are no symptoms at all, the problem may be intermittent and clearing the code may resolve the issue temporarily. If this is the case then you should definitely check the wiring to be sure it's not rubbing on anything, grounding, etc. The code may come back.


Hope helps (remember to rate this answer).

Posted on Mar 01, 2011

  • 252 Answers

SOURCE: I have a knocking noise

I HAVE SAME JEEP SAME PROBLEM...I have found out after research that all these jeeps like yours and mine have a common problem with engine clogging and the valves sticking and the rocker arms coming off.....This is true I pulled my valve cover off and the rocker arm had come off because the valve was stuck ....Pressure between the rocker and the cam and the valve is the only thing that will keep the rockers from falling off......And when the valve starts to stick the rocker falls off.....This is sad but true.....Also it is badly clogged with black chuncks of burnt oil....I dont know what causes this other than the wrong weight oil....but I only used the wrong oil maybe 2 times...
There should be a recall on these because the rocker arms shouldnt come off.....I think the rockers are wrong from the factory....I am a level 2 chrysler tech.and also ASE certified.......It makes me angry that they built these so weak !! ....All you can do is remove the heads and have a complete valve job done and clean the oil pick-up tube in the oil pan as well....then a complete engine flush..
.....ONLY use 5w20 weight oil also........If you dont have the cash dont tear it down cause I almost guarantee you have the same problem as I.............Hope this helps.................Metalpoet

Posted on Mar 07, 2011

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1 Answer

On my 1990 Isuzu 4-wheel drive pickup I got a 2.0 four cylinder motor in it start knocking I got a chance to buy 2.8 liter V6 grover v 6 interchange with the four-cylinder


can be done with a few mods

needs the.engine bay wiring loom of the V6 ... ECU if not diesel
will need the V6 gearbox and transfer case

V6 exhaust and fuel pump

unknown ratios but check if
power train, diffs and drive shafts are the same as th e4

May 29, 2016 | Isuzu Cars & Trucks

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How do you install camshaft and lifters in 2003 Cadillac CTS 3.2 Liter V6 Engine?


Consider purchasing warranted rebuilt cylinder heads from "Cylinder Heads International" for $275.00 each with free return shipping of your cores. If you choose to do the work yourself get a library card which will allow you to free online access to Haynes or Chilton's repair manuals. Or for $27.00 get a one year subscription to "All Data" which has expanded information. Any of the above will have the timing spec's. Don't make the mistake I made trying to do it without borrowing or buying the tool for that purpose.

Oct 15, 2014 | 2003 Cadillac CTS

1 Answer

Is there ANY other engine that will fit in a 2002 jeep liberty limited? 3.7L v6... need a whole new engine


3.7L EKG Powertec, engine. SOHC with roller followers,
did you check compression, or just P030x codes???????
and what if its just a stuck valve or collapsed lifter
why not ask for help in diagnosis?
compression bad? on one or more? cylinders, post #
pull the Valve covers, see if there are broken valve springs
or bad cam lobes, or lifter bad? (motion)
if it didnt burn oil , try rebuilt heads.?

ran for 12 years, so what is the mileage>? 300k?
Oil changes, at 5000 ?

the 3.7 may fit...says wiki.
warning, some engine blocks may NOT be same. (filter mounts, engine mounts) check first.
but you can find this at any engine builders web site. (google them)
ive swapped many and engine, even wrong engines.?grin
there are always choices, i always have and had spare cars.
so down time is never an issue for me.
but others yes. (rent a car is one option while fixing another)
1: if the block is bad get a short block.
2: if the heads are bad get yours rebuilt , or exchanged.
3: if you blew the engine to total destruction, pistons hit valves? (rare)
then get a used engine, or buy a rebuilt.
or pull yours and take it to any top machine shop and drop it off.
bingo, fixed and cheap too. no middle man, to rip you.

history.
The 3.7 liter PowerTech V-6 engine is, essentially, the 4.7 V-8 with two fewer cylinders.
then later, morphed to the Pentastar V6. (today's motor)
cast iron block, (lasts long time, easy to bore and rebuild)
no rubberband cam belts, real chain, drive.
2 valves per cyl. making head rebuilds fast and cheaper.
forged pistons, not cheap cast.
MOPAR is not POS.
ask engineer Brian Crothers

I run the 3.8L in my 08 JK.
its a real low tech, push rod motor. (ended in 2011)

id fix mine, if it failed
my guess is it is head failure, , so get the newer
rebuilds with pinned, valve guides and run it.




Jan 10, 2014 | 2002 Jeep Liberty

1 Answer

3.4L v6, Knocking & Check Engine light - Misfire Cylinder #5


ok the best solution will be as follow it may be the fuel injector on cylinder #5 check the coil it may be malfuntion also a burn valve will cause the same issue.

Jul 13, 2012 | 2001 Chevrolet Impala

1 Answer

I have the p0306 code showing for my 2004 3.7 liter V6 Jeep Liberty. There is a loud knocking/popping associated with this misfire. I have changed all of the spark plugs and the ignition coil for...


but not one ASE mechanic i bet. they get it right.
so 306 means must misfire.
or better, weak Combustion on #6
so did your mech check compression on #6?
seems not. or vacuum for bouncing, seems not.
that knocking, did he check that first. it must NOT knock.
that knock is serious and will get worse, Id not drive it.
not me, engines are expensive why make it worse?

Jan 04, 2011 | 2004 Jeep Liberty

1 Answer

2002 jeep liberty 3.7 liter 6 cylinder 4x4 spark plug gapage. What should it be?


Make: JEEP
Model: LIBERTY - SPORT
Year: 2002
Engine: V6 - 3.7L - FI - - GAS

Part Number RC9MC4 .044" (Original Equipment Manufacturer and/or Original Equipment Equivalent)

Hope helps (remember to rated and comment this).

Sep 12, 2010 | 2002 Jeep Liberty

3 Answers

Firing order diagram 2003 jeep liberty which is #2 cylinder


You didn't supply the engine size,so I include both options.

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Aug 28, 2010 | 2003 Jeep Liberty

2 Answers

What is the spark plug firing sequence for my 2000 honda accord?


2.3 L 4 cylinder is 1-3-4-2 & the distributor rotates clockwise.

3.0 L V6 is 1-4-2-5-3-6

2.3 liter
Cylinder # from passenger to drivers side 4-3-2-1
Distributor rotating clock wise #1 is at 6 O"clock (towards the radiator.)

3.0 liter V6
Cylinder # from passenger to drivers side, firewall 1-2-3
Cylinder # from passenger to drivers side, radiator 4-5-6

Good luck and keep me posted if you have any other questions.


Nov 08, 2009 | 2000 Honda Accord

1 Answer

Engine knocks like diesel


A loud knocking sound could be a variety of things. On the top of the list is Bad connecting rod bearing and main bearings in the bottom end of the engine. Bad lifters may also be a problem. I had to burst your bubble but a loud noise in your engine, like you describe may be alot of pre-mature internal engine wear may be cause by lack of maintenance. You should have it check by a professional before you invest money into fixing it. Remember if the cost of the repairs exceeds that retail value of the vehicle. Its time for a new one. Good Luck

Dec 09, 2008 | 2002 Jeep Liberty

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