Question about 1996 Jeep Grand Cherokee

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Check engine light on. codes all say misfire all cylinders.

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  • Contributor
  • 25 Answers

I would start with a complete tune up spark plugs, plug wires, distributor cap, rotor,(i even saw a complete kit including air filter for around fourty dollars on e-bay) and have your coil tested a free service at autozone then have them scan it again (free also), and erase the mil light. Hopefully this takes care of the problem chris

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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j_del
  • 1586 Answers

SOURCE: 1999 vw jetta 2.0

Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

Posted on Sep 02, 2008

  • 1 Answer

SOURCE: 1997 ford f150 cyliner 7 misfire

sme problem had to have it put on computer and codes reset

Posted on Feb 05, 2009

chuck943
  • 783 Answers

SOURCE: engine code p0307 cylinder #7 misfire

It could be carbon deposits on valve seats keeping valves from totally closing. You can try getting you a can of motorcraft PM3 top end engine cleaner and get engine up to operating temp then remove one of the small vacuum lines from the intake and draw the contents of the can slowly into the engine.After you have drawn in the contents shut engine off and let it soak for about 45 minutes then crank it back up and let it run until it clears. Now it will smoke like a forrest fire while you are doing this so don't be alarmed,just tell the neighbors you are spraying for mosqitos.This may cure the problem. If not you may be looking at a valve job.
This can be verified with a compression test if this is what is causing it.

Posted on Feb 05, 2009

  • 1 Answer

SOURCE: Check Engine Light is on and the code is P0303

Hello I need a help.
I have 1999 lincoln town car 4.6L V8.They have check engine light on. P 0303 cylinder 3 missfire.
I was changed spark plugs,fuel filter. check compression test 150psi. fuel pressuer 50.
swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code

Posted on Apr 12, 2009

bschilz
  • 2049 Answers

SOURCE: the code reads P 306 misfire on cylinder 6. How

A P0306 code means that the car's computer
has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6.

Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present

Causes

A code P0306 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 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.

Posted on Feb 15, 2010

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


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1 Answer

Missfiring detected in OLDSMOBILE intrigue 2002 3.5L


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

-----------
Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
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This will help.

Thanks.

Jan 30, 2012 | 2002 Oldsmobile Intrigue

1 Answer

Missing,viborating


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The vibrating tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2009 Ford F-150

1 Answer

Vehicle missing,shaking,engine light comes on


Misfire could be a number of things:
a) spark plugs - change them if used over 15K miles - inspect/regap.
b) spark plug wires - change them if over 15K miles - inspect
c) ECM (electronic control module) - test with HEI (high energy ignition) tester.

The shaking tells me that the engine is running on less than its normal compliment of cylinders - the shaking is produced by the imbalance caused in the engine by one (or more) cylinder(s)
not firing at all.

The "Check Engine" light probably is coming on due the the misfire condition. Go to Pep Boys or
Advance Auto Pats, where they'll tell you (free) your codes causing the "Check Engine' light to be
lit - the code coming from your truck's computer will probably be one or more of:
P0300 - Random/Multiple Cylinder misfire detected
P0301 - Cylinder 1 misfire detected
P0302 - Cylinder 2 misfire detected
P0303 - Cylinder 3 misfire detected
P0304 - Cylinder 4 misfire detected
P0305 - Cylinder 5 misfire detected
P0306 - Cylinder 6 misfire detected
P0307 - Cylinder 7 misfire detected
P0308 - Cylinder 8 misfire detected
P0313 - Misfire detected with low fuel

Jun 23, 2011 | 2004 Ford F150

1 Answer

CHUGGING ALONG WITH FLASHING CHECK ENGINE LIGHT....???? 2002 FORD WINDSTAR WHERE TO BEGIN


A flashing Check Engine light means you have a ignition Misfire, start by replacing the spark plugs and spark plug wires, one or more is defective. If you have a electronic engine control fault code reader the cylinder or cylinders that are misfiring will set a fault code, the codes are P0300-P0306, the last number being the number of the cylinder ( cylinders 1-6) the computer has detected a misfire in.

Apr 18, 2011 | 2002 Ford Windstar Cargo

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

While driving the car started to miss badly, the check engine light came on then began to flash. checked for codes, engine missfire was the only stored code. owners man. said cat. problem ?


It's not a cat problem or you'd have misfires on all cylinders. P0300 is random misfires, and the codes increment to show what cylinder is misfiring. P0301 is a misfire on cylinder 1, P0302 is cylinder 2, etc. You likely have a bad coilpack. Whichever cylinder is indicated, replace that coilpack.

Sep 16, 2010 | 2004 Audi A4

2 Answers

Check Engine Light is on and the code is P0303


Hello I need a help.
I have 1999 lincoln town car 4.6L V8.They have check engine light on. P 0303 cylinder 3 missfire.
I was changed spark plugs,fuel filter. check compression test 150psi. fuel pressuer 50.
swiching cylinder 1 to 3 fuel injector and coil. but they still have engine code

Feb 27, 2009 | 1999 Lincoln Town Car

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