Question about 2006 Jeep Grand Cherokee
Vehicle had other codes but all have been repaired
It sounds like it could be number 5 injector. I suggest you swap number 5 injector with one of the others and see if your misfire moves to this cylinder
Posted on Jan 05, 2013
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Posted on Jan 02, 2017
SOURCE: 2002 Jeep Liberty Sport 3.7L
We have an 02 Liberty 3.7L, here at my repair shop, after customer replaced, spark plug's and all coil pack's, brought it here to my shop, was running with two cylinder's miss, did cylinder compression test, no compression on two cylinder's, remove valve cover's, found two rocker arm's off, remove cylinder head's, and found that on those two cylinder's the valve seat's had drop, keeping the valve open, and that's why the two rocker arm's had come off, do a cylinder compression test, could be the same thing, hope this was very helpful.
Posted on Aug 30, 2010
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
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
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
A code P0305 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
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Posted on Dec 07, 2011
check the fuel injector in most cases when the number 1 injector goes bad the other injector have the tendency to misfire. Also you need to check the fuel pressure to see if is to low due to a dirty filter.
Posted on Apr 25, 2012
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