Question about 2002 Jeep Grand Cherokee

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What would cause a cylinder 5 misfire in my 2002 jeep grand cherokee 4.7L

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04jeeplibertypo305changedinj coil plug counters stayed high for #5 saw spikes on other cyls changed chk sensor no spikes on any misfire counter a week later back with a po 305 ?

Posted on Jul 24, 2010

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2001 grand Cherokee 4 x 4. Code P 03005


p0300 is on all cars, with this code, misfire random.
p0305 (typo) is cylinder 5 , only misfiring.

3 causes, ask.

Jul 31, 2014 | 2001 Jeep Grand Cherokee

1 Answer

Replaced #5 coil and all plugs on 06 jeep liberty vehilce still shows misfire on #5 cylinder after clearing all codes


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

Jan 04, 2013 | 2006 Jeep Grand Cherokee

1 Answer

2002 grand cherokee, overland 4,7L engine doesnt


Hi Joko,

What you are describing is a failure of a main circuit. The first thing you should check is yo make sure that your battery is in good condition and that the cables are clean and tight. Let me know if yu find anything wrong there. Then there may be another main circuit problem. Check all of the fuses in your fuse block in the engine compartment. If any of these fuses are blown, it will usually cause several things to not work. If you find any fuses blown, DON'T REPLACE IT YET. Let me know WHICH fuse is blown and I can help you find out why it blew so you can get the problem fixed.

Get back to me on this and we will continue.

-Dave (dttech)

Nov 17, 2011 | 2002 Jeep Grand Cherokee

1 Answer

What would cause a cylinder 5 misfire in my 2002 jeep grand cherokee 4.7L


A misfire 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
Poor compression
Defective computer

If you notice 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.

Mar 24, 2010 | 2002 Jeep Grand Cherokee

3 Answers

1999 jeep cherokee 6 cylinder engine light


1.Plugs
2. Vacuum leak
3. Injector fault
4. High or low fuel pressure.
Thats the list of things to check.
This is a #3 cylinder misfire.
There is also TSB about #3 injector needing added heat protection. This could definitely be the cause. I start at plugs and go from there.
Hope this helps.
Thank you,
Lee

Dec 12, 2009 | 1999 Jeep Grand Cherokee

1 Answer

2002 jeep cheroke misfires on cylinder #4


Check intake gasket and vecuum hoses near intake runner #4. To do this spray carb cleaner at parting line between manifold and block while engine is running. If leaking rpm will dramatically change. A leak will lean out that cyl and cause misfire

Feb 25, 2009 | 2002 Jeep Grand Cherokee

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