Question about 1998 Jeep Grand Cherokee

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Keeps turning off.it was put on the computer an it only says spark plug 2 misfires. No check engine light on.

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A check engine light will only come on when:
There is an electrical problem, A bad sensor, Open Circuit, Low or High Voltage to Circuit.

I personally would do a compression check, new air and fuel filter, and check all vacuum lines.
also check engine to body ground wire

Posted on Jun 23, 2009

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Posted on Jan 02, 2017

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This will help.

Thanks.

Jan 30, 2012 | 2002 Oldsmobile Intrigue

2 Answers

I have a 2001 Jeep Grand Cherokee with a 6 cyl engine. While driving Saturday afternoon it suddenly started shaking and the check engine light started flashing. After a few minutes the light became steady,...


Even though the plugs are "new" it can get fouled out. Soon as you put in a new set, one could go bad on start up. The plug wire could have hit a hot surface and burned into the insulation causing a spark jump. You can check the wire by holding a screwdriver in the spark plug end and holding it 1/4' from a metal surface. Have someone to turn the engine over to see if you have a nice blue looking spark jumping from the screwdriver to the metal. Also, at night start the engine and look under the hood for any sparks jumping from the area. you could also have a misfiring injector but I would put that at the end of list.

I would check for jumping sparks first, then install a new plug in #2. Right now you would only be out of $2 for the plug.

Apr 11, 2011 | 2001 Jeep Grand Cherokee

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

Check engine light is on - #2 cylinder misfires


hey
id say no:2 cylinder isnt firing rite, maybe due to a faulty ignition lead or spark plug. id say get new spark plugs.
good luck

Dec 29, 2009 | 1998 Jeep Cherokee

1 Answer

Misfire on cylinder No. 3


try pulling the plug out and putting a very small dab of loctite thread locker on it and see if this stops the problem.

Aug 27, 2009 | 1998 Subaru Legacy

1 Answer

Check engine light on. 4 cylinder. Light flashes on acceleration. Sometimes idles rough. Computer scan reads random misfire and #2 & #3 misfiring. Added fuel injector cleaner but no help yet. Cleared...


There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

Dec 07, 2008 | 1999 Toyota Camry

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