I'm getting a check engine light code of 0604 that translates to a misfire on Cylinder 5. Has anyone had this type of problem?

I have replaced the EGR and fuel filter recently and that didn't fix the problem. I have read this is possibly a fuel injector or spark plug issue? Any help is appreciated!!

 

0603 0604 0605 0606 0607 0608
If one cylinder is misfiring the problem is spark or fuel. A misfire due to a spark problem usually results in a Service Engine Soon light and one of these Diagnostic Trouble Codes:
0608 - Cylinder 1 misfire
0607 - Cylinder 2 misfire
0606 - Cylinder 3 misfire
0605 - Cylinder 4 misfire
0604 - Cylinder 5 misfire
0603 - Cylinder 6 misfire

There are two tests the home mechanic can make, the sound test and the resistance test.

Sound test...
This test is performed with the engine idling. Use a mechanic's
stethoscope or a length of rubber vacuum hose, and listen to each injector.
All injectors should sound alike. If you find one which makes a different
sound (or no sound at all) you have found a problem.

Resistance test...
This test is performed with the engine off. Use an ohmmeter to measure the
resistance of each injector. This does not require removing the injectors.
I don't know the correct resistance value for the injectors on your model,
but they are typically a low number such as 16 ohms. The important thing
is they should all be equal. If you find one injector with substantially
higher resistance than the others, it is bad. If you find one with zero
ohms (short circuit) that is truly unfortunate, because the injector is bad
and it may also have damaged the Engine Control Module (the computer)
because of excessive current drain.

Measuring the resistance of the front bank of cylinders is easy because the
injectors are in plain view. Disconnect the injector electrical connector
for cylinder #2, measure the resistance, reconnect the connector. Repeat
for the cylinders #4 and #6.

Measuring the resistance of the rear bank of cylinders is almost as easy,
but it is difficult to reach the injectors. The resistance may be measured
at a conveniently located electrical connector. Notice the largest,
thickest electrical harness at the top of the engine. This is the Engine
Control Harness and it is shaped like a U, with the open top of the U at the
driver's side of the car. The U has two corners. Look at the corner
nearest the passenger seat. Just inside that corner you will find an 8-pin
electrical connector. This is connector F131. Disconnect this
connector. Now look at the male part, the connector half with the pins
exposed. They are arranged in two rows of four pins.
The pins are numbered 1 - 4 (top row) and 5 - 8 (bottom row).
Measure the resistance of:
- injector #1 between pins 1 and 2.
- injector #3 between pins 1 and 6.
- injector #5 between pins 1 and 5.
Be sure to measure the PINS, not the female receptacles.

The dealer's shop is equipped with high-tech diagnostic instruments. These are wonderful devices but they are expensive and the dealer has to recover his cost by charging you for diagnostic time. Sometimes the home mechanic can do legitimate diagnostic work with nothing more than a ohmmeter and a rubber tube.

To Test Ignition Coils:
With the ignition off, disconnect the electrical connector from the ignition coil. Connect the positive (+) probe of an ohmmeter to terminal no. 1 and the negative (-) probe to terminal no. 2 of the coil connector - the meter should indicate infinite resistance. Reverse the meter leads ( negative probe to terminal no. 1 and positive probe to terminal no.2) - the continuity should be indicated, but not zero ohms. If the results are not as specified, replace the coil.
Connect an ohmmeter between the secondary terminal ( the one that the spark plug connects to) and terminal no. 1 - the meter should indicate infinite resistance. If not, replace the coil.

 

The testing of coils packs with an ohm meter is unreliable. i have several coils which test just fine this way but put them in the car and they will missfire. A better way would be to switch the coil pack with the cylinder next to it. Reset ecu and drive around. If you get an error code for the new cylinder then you know the coil pack is bad. If you get the same error code again for cylinder #5, then I'd suspect the fuel injector. Test injector as stated above, if they test ok, I'd suggest running Techron through fuel system as the injector maybe clogged.

Good Luck.

 

I reset the ECU and drove around for a little bit and it seems to have stopped misfiring, and is running rather smooth now. When I replaced the EGR valve, I disconnected the battery. I have read that it can make your car run rough for a while while the ECU relearns the operating peramters of the engine.

Right after I installed the EGR, I took it for a hard test drive, that's when it was misfiring. Could the reason have been me driving it harshly while the computer was relearning the engine parameters?

 

This is all great information...but when I had that code, I discovered that one of my coil packs came loose. Must not've tightened it up quite as tight as I should've when I did the plugs.

Check that out first...a lot of times, the simplest explainations are the correct ones.

fisher01: Good thinking...that's what DBM says too!
http://forums.maxima.org/showpost.php?p=258271

 

Can a bad ignition coil cause the car to have trouble starting periodicly? I have had the happen on and off over the past few weeks.

Also I noticed the ignition pack and spark plug wire all seem to be one assembly. If you go to the parts store and order a new coil pack does it come as all one assembly or is the spark plug wire something that attaches to the coil?

 

All one piece...and very expensive (IIRC).

 

I looked it up on autozone, it looks like they sell in a set of 3 for about $60. That sound right?

 

I've never priced the autozone ones...personally, I'd probably go with Nissan coils...I haven't compared the quality (I've never needed one), but I feel confident that the Nissan parts are pretty damn good.

 

Does anyone know if there are any online vendors that sell Nissan parts?

 

Yeah...I know of a few dealerships:
www.courtesynissan.com
www.jerryromenissan.com

Jerry Rome Nissan has a pretty cool database...nice looking page.

 

Thanks sryth, these look great.