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What would cause intermittant misfire on cylinders 2 and 4? the car is a 91 maxima. when it misfires, i get a puff out the tailpipe. cahnged plugs, plug wires, distributor and rotor. changed injectors and they seem to be fireing good. checked fuel pressure and it is per spec. timing is set to factory spec (15 deg) tried something else and maybe someone can give me an answer. timing light connected to spark plug wires and pointed at the fire wall give consistant flashes. when connected to spark plug wires 2 and 4 i get an intermittant flash pattern consistant with the missfire. what might cause this?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 422 Answers

SOURCE: 1998 chevrolet k1500 pickup 305 a misfire in # 2 cylinder

hi there, if you can feel the misfire at an idle but not at a higher rpm than the fuel pressure regulator is bad im working on one right now that has mifire code and random misfire codes coming up

Posted on Aug 28, 2008

Big Poppa Ma
  • 302 Answers

SOURCE: Check engine light on

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.

Posted on Dec 07, 2008

  • 1 Answer

SOURCE: 99 4runner 5vz-fe 3.4 misfire

I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.

Posted on Jan 23, 2009

  • 1 Answer

SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire

did you check the injector pulse on that cylinder and it also could be the pcm , i had a taurus and a sable with good coils stop firing 2 cylinders and it was the pcm ,the code it gave was secondary coil but changed the pcm and it worked fine

Posted on Aug 29, 2009

  • 192 Answers

SOURCE: Took my car to have check engine light checked. It

In modern cars so much can go wrong to indicate an issue and a computer in the car can get confused as to what is really occurring. In most cars a misfire indicates either an incorrect firing order, shorted wires, bad plugs, or bad coil. Since you have replaced the wires and plugs we can rule those out. Im also assuming after the second engine code you pulled #2 plug and made sure it wasnt fouled with oil, was gapped correctly, and reinserted. To produce a sufficient spark for combustion the alternator sends power to a "Coil" which is in reality a storage point that then sends an amplified electrical current down the spark plug wire to the cylinder to fire the plug. If the car is truly misfiring you will notice a rough idle, fluctuating RPM's, and lack of acceleration. If you are experiencing any of these I would look at replacing the coil. If you arent experiencing any of these I would have the code cleared again and complete one drive cycle 100 miles and then have codes read again. If you still get a Misfire error some other causes known to occur with Rio's are fuel filter issues, gas caps, and fuel injector issues. Although rare, these can cause issues with the cars fuel delivery and emissions which can confuse the sensor in the ECU. I would try injector cleaner, replace the fuel filter, and gas cap . If funds are an issue then based on symptoms I would start with injector cleaner first $3, Filter $12, Gas cap $12, Coil $48 to $200+

Posted on Jun 06, 2010

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Need fuse box and semantics for 99 Lincoln Continental it has code 301 & 308 stalls when you put it in drive.


What do you need fuse box an wiring diagrams for ? P0301 an P0308 are misfire codes . Has nothing to do with fuse , spark plugs ,spark plug wires etc....
P0301 through P0310 - Misfire Detection Monitor The misfire detection monitor is designed to monitor engine misfire and identify the specific cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a cylinder due to absence of spark, poor fuel metering, poor compression, or any other cause.
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The MIL will blink once per second when a misfire is detected severe enough to cause catalyst damage. If the MIL is on steady state, due to a misfire, this will indicate the threshold for emissions was exceeded and cause the vehicle to fail an inspection and maintenance tailpipe test.

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2001 Ford E-250 has excessive oil consumption with no visible leaks and has a p301 misfire code


Do you notice any blue smoke out the tailpipe?
The P0301 code means you have a misfire in cylinder 1. If I were to put these two symptoms together, I would guess that there is oil leaking into the cylinder, which is causing it to misfire. The oil then burns out the back.
If this is the case, it is probably because your spark plug tubes are leaking. Replacing the valve cover gasket or spark plug tube seals (some cars have a valve cover gasket that has the tube seals included) will solve the problem.

You can check for the leak by pulling the spark plug wire out of that cylinder and seeing if it is oily. If it is, there is your leak.

This is just a first guess. Let me know what you find.
Also, let me know about whether or not your tailpipe has blue-colored smoke coming out.

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I'm confused! The heading on this question says 2004 Saturn Ion and the question itself says 1996 Nissan Maxima.

Doesn't matter much. The answer is the same for both. There are MANY things that can cause misfires. It could be spark plugs and wires. It could be ignition coils, it could be cylinder head gasket failures. It could be vacuum leaks. It could be broken or burnt valves. It could be faulty injectors....The list goes on, but I think you probably get the point by now.

Anyway, "Random cylinder misfire" simply means that you have more than one cylinder that is misfiring. It could be two cylinders misfiring or it could be ALL of the cylinders misfiring at times, or any combination in-between.

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A Bad Knock Sensor will not cause a misfire, unless the advance is off due to a faulty Knock Sensor. The O2 Sensor will cause a random misfire.

Good luck on this repair.

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Misfire in cylinder 3


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1999 Nisian Maxima and need to know what codes mean?


P1320 Ignition Signal
Signal wire from distributor
P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
O2 senor ( The one before the cat converter )
P0300 Random/Multiple Cylinder Misfire Detected
The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.
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Incorrect fuel pressure

EGR system concerns: leaking EGR valve or restricted ports
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Ignition system concerns including, but not limited to:
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Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

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Also, Takeout #1(from front of the car on your left) and #2 and compare two plugs.
perheps #2 sparkplug is white(at contact point), Than you are in deep troble(head gasket problem, white smoke comes out of tailpipe) like I have.

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