Question about 1998 Ford Explorer

2 Answers

Code shows misfire on #4 spark plug, happens every four months like clock work. Change the spark plug and it is fine until it happens again.

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2 Answers

The spark plug was never your problem

You may have one plug fail in 50 years of
driving

If you have coil on plug, then the coil
If you have a module and wires,then
the module

Also vacuum leaks on manifold gaskets

Posted on Mar 12, 2011

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It is possible that that particular cylinder is getting enough oil to the plug (seeping by the rings or valve) to foul it out after a period of time.

Posted on Mar 12, 2011

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Hello...I have a 2009 chevy cruze 1.8L ,some 3 months ago,the car had some pulsating and vibration during driving , so I changed the spark plugs and the problem was solved, but after about a month,the car...


Was any of the previous spark plugs fouled? Dirty? If so you need to investigate whether the problem is oil or fuel causing the fouling. Also a possibility is that you have a bad plug wire and when you changed plugs you disrupted the plug wire enough to make contact. Now possibly the plug wire is showing too much resistance causing a misfire at idle. Only way to be sure is to have the car scoped to see if the wires are proper or defective. That is unless you are the change parts and try type. In that case try a new set of wires. The reason is because at idle the voltage is not as high as it would be at higher rpm.

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1999 ford ranger 4.0 cylinder 4 misfire


If you are mechanically inclined make sure the number four wire is tight at both ends. at the spark plug end see if you can wiggle the plug, make sure it is tight and gapped properly.

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Cylinder #1 continues to Misfire


What DTC code(s) are you getting?
You performed a compression test on cylinder #1; did you test cylinder #2?
Compare the readings, if there is a significant difference in compression readings between the two, you may have a bad head gasket, a bad valve, etc.
The bottom line, the problem is internal to the engine.

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My Nissan yesterday started idling terribly and when I was driving it was shaking and vibrating so bad it felt like I was driving with square tires.


I doubt the EVAP problem is causing the rough running. The knock sensor code means the knock sensor noted a severe vibration. The cylinder 4 code could mean the miss has become bad enough to trigger a code for one cylinder.
I would look at the injectors and for a vac leak. And the spark plugs can be firing in air but not inside the cylinders under pressure.

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6th cylinder misfire. replaced spark plug and ignition coil 6 months ago and already misfiring again.Is this a problem with 2000 toyota tundras or is this normal to have to change spark plugs and ignition...


Did u find code p0306 comes up ? Two things can cause this if the plug and coil have been replaced.the intake manifold may be leaking in the area of cyllinder 6 or its a mechanical issue.try doing a cyllinder misfire test and also check the compression on all cyllinders

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3 Answers

Engine light keeps comeing on mecanic change o2 senser worked for half hour came back on cods keep saying its miss fireing have had this problem for a month know


Start Small work to Big = Saved Money!
The Code(s) should be telling the specific cylinder(s) that are misfiring. Do you know waht the code is?
Target those cylinders 1st before testing the unaffected cylinders.
The following should isolate the problem(s).
1. Spark plugs - take out-reconnect back to wires and test spark plugs for getting sparks. If none: Don't replace them yet. GO TO 2. If the spark plugs are worn, dirty them replace them.
2. Remove spark plugs form end of ignition wires and test for spark from the wire. If none: Don't replace them yet. GO TO 3.
3. Remove the wires from the coil connection and test the coil for spark for each cylinder. If none: Don't replace it yet.
4. Test each spark plug and wires this way.
5. Coil Packs normally provide fire for 2-cylinders at the same time. The two are paired across from one another.
6. Test the coil for fire, amount of fire and if there is both cyclinders firing.
Misfire and the O2 Sensor got replaced??
Good Luck and get back with me if you need additional help or if this solved the problem.

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ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

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