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How to fix cylinder 8 misfire on jeep commander

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5 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 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

Posted on Feb 26, 2009

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  • 29 Answers

SOURCE: 2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder

Plug, plug wire, plugged or open fuel injector. are the most likely.

Posted on Sep 28, 2009

ZJLimited
  • 17970 Answers

SOURCE: P0308 cylinder 8 misfire detected? How to repair?

Fuel injector cleaner commonly has a low success rate, and will not help if it's more than one cylinder that is missfiring. The fact that you have a "rattle" noise, leads me to beleive the engine is not receiving fuel on one or more cylidners. If it is all the cylinders, than the fuel pump may be the culprit, or the fuel pump circuit. But if only one cylidner is missfiring than it is a possibly an injector. A code P0300 refers to all cylinder missfires, and any code between P0301-P0308 distinugiushes a particular cylinder.

Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms

Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

Posted on Mar 05, 2010

  • 1 Answer

SOURCE: what would cause a cylinder 5 misfire in my 2002

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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2006 grand prix gxp 5.3. When you are driving normally it will miss from 50mph and up. When you punch it it doesn't miss a beat. I cleaned the maf sensor and air filter, Plugs were replaced.


It's probably a coil breaking down , have a scan tool hooked up an have misfires checked to see which cylinder is missing .
Ignition Coils
Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.
Drive it long enough like that (with it misfiring ) the check engine light will flash . This is to warn that a catalytic converter damaging event is taking place . This would also set a DTC - diagnostic trouble code
DTC Descriptors ?€¢
DTC P0300 Engine Misfire Detected


?€¢
DTC P0301 Cylinder 1 Misfire Detected


?€¢
DTC P0302 Cylinder 2 Misfire Detected


?€¢
DTC P0303 Cylinder 3 Misfire Detected


?€¢
DTC P0304 Cylinder 4 Misfire Detected


?€¢
DTC P0305 Cylinder 5 Misfire Detected


?€¢
DTC P0306 Cylinder 6 Misfire Detected


?€¢
DTC P0307 Cylinder 7 Misfire Detected


?€¢
DTC P0308 Cylinder 8 Misfire Detected

Apr 26, 2016 | Cars & Trucks

1 Answer

03jeep lbertyrandom missfire cyl 2 4 6check engine light flashing


Check Engine Light/Misfire Due to Intake Valve Locks ...

repairpal.com > Problems > Jeep > Liberty
Jeep Liberty Check Engine Light/Misfire Due to Intake Valve Locks/Valves. ...Misfire cyc 4 and random cyc misfires, changed coil packs and plugs... sounds as if rod ... Light came on again (misfire on cylinder 4) - switched coil from 4 to 2. Light ...

Jeep Liberty Questions - Cylinder Misfire code - CarGurus

www.cargurus.com > Questions > Jeep > Liberty

CarGurusMay 27, 2009 - #4 misfire new plugs and coil pack on #4 light came back on after 300 miles if ... How come it stopped misfiring for 2-3 months, and now is back? ... I have a 2005 Jeep Liberty 6 cylinder, engine light came on scaned the codes ...

Liberty Cylinder Misfire / Computer issue? - JeepForum.com


Nov 28, 2015 | Cars & Trucks

2 Answers

What is the cause for a cylinder misfire


Spark plug(cracked, carbon tracking, incorrect gap). Ignition coil( inoperative, open/sorted, computer not comanding it on/off). Injector(inoperative, open shorted or computer not commanding it on and off). Compression(wash down, worn rings, belt or burnt valves...). Try swapping coils and see if the misfire moves to another cylinder if it does replace the bad coil.

Feb 27, 2013 | 2007 Jeep Liberty

1 Answer

We have a 2008 jeep commander, check engine light is on. ran a diagnostic because of engine noise, it said cylinder 4 misfire. so far we replaced the or, sparkplug, and coil for cylinder 4, it still h


google jeep commander forums join one and post youre question there if no luck than google grand cherokee forums and try there it is basicially the same vehicle

Feb 05, 2013 | 2008 Jeep Commander

1 Answer

How do I fix a p300/po206 misfire code


Replace the fuel injector on cylinder 6.

Jul 06, 2012 | 2007 Jeep Commander 4.7

1 Answer

2005 Jeep Liberty has hesistation after it warms up. Code says misfire cylinder 4 replaced coil, wires, fuel pump, fuel filter


Check injector pulse to make sure the computer is commanding the injector on and off. Check that the plug isn't cracked. Check cylinder compression if all ok you may need and injector but you could probably try an injector cleaning service( not the stuff you throw in the tank)

Jun 14, 2012 | 2005 Jeep Liberty

1 Answer

Sport Wrangler 6 cyl. Engine lite flashing. Diagnostic tool lists code PO305. I looked it up and it states misfire in cyl #3 & 5. How do I fix this?


Check the plugs, wires and coil pack for these two cylinders. Most lilkely it is the coil pack, they work for 2 cyclinders at a time. cylinder motors use 3 and 8 cyl moters use 4 of these. If your und=sure where the coil pack is, follow it backwards from the spark plugs.

Jul 08, 2011 | 2002 Jeep Wrangler

3 Answers

I changed my spark plugs and afterwards the chech engine light came on. the jeep runs great. what can make that happen?


IT could be something such as a loose plug wire.The best advise I can give you is to take your jeep to your local auto parts store and have them pull the codes out of your on board computer.This will give you an area that you can concentrate on to make the necessary repairs to get your check engine light to go out.

Feb 21, 2011 | 2006 Jeep Commander

1 Answer

1995 Jeep Grand Cherokee not firing on #6 and #8 cylinder. Checked plug wires, plugs,rotor,cap. Its only on the #6 and #8.


usually single cylinder misfires are are problems in the secondary wiring of the ignition system (plugs and plug wires) if you have replaced those and the cap terminals are not cracked or chipped and there is no moisture on it all i would check the coil or Icm

Apr 15, 2010 | 1993 Jeep Grand Cherokee

3 Answers

P0308 cylinder 8 misfire detected? How to repair?


Fuel injector cleaner commonly has a low success rate, and will not help if it's more than one cylinder that is missfiring. The fact that you have a "rattle" noise, leads me to beleive the engine is not receiving fuel on one or more cylidners. If it is all the cylinders, than the fuel pump may be the culprit, or the fuel pump circuit. But if only one cylidner is missfiring than it is a possibly an injector. A code P0300 refers to all cylinder missfires, and any code between P0301-P0308 distinugiushes a particular cylinder.

Misfiring
1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms

Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

Mar 05, 2010 | 1997 Jeep Grand Cherokee

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