Help!!! I'm having a problem with the Max that I, and three mechanics, can't figure out!!! It's a '99 SEL, auto with 90,000 miles. For months now it has intermittently run like crap... I finally pulled the code and all I got was 0607, "Cylinder # 2 misfire". Now, after changing the spark plug coil, the spark plug, and most recently, the injector, it's still misfiring. Being that it does this intermittently, I don't think it's a mechanical problem, such as a bad valve… It "mostly" does this when the engine is cool and it seems to go away if I drive for a while, (1/2 hour). However, it sometimes will misfire fire all day and sometimes it will run great all day. Also, it seems that the outside temp has some effect…If it's very cold ( under 20 ) or very warm (over 75) the problem mostly goes away. This is really starting to **** me off and I'm tired of throwing $$$ at it, so if somebody out there has ever heard of something like this or has any ideas, I would greatly appreciate it. Also, the other day it was misfiring and the engine light was blinking all morning, but it didn't store any codes… Is this normal?

Salz...

 

Are you sure you changed the correct coil pack? The misfire you describe, along with a blinking CEL is definately associated with a bad coil pack.

 

I was told recently by a mechanic that a car will continue to do this for awhile even after fixing the problem. Something about the car still throwing the code, even though the problem has been fixed, it's supposed to eventually cycle out. I'm not sure how accurate my info is, take it for what it's worth.

Brent

 

Yes, I'm sure I changed the correct coil pack…. As another test, we also moved the new coil pack, plug, and injector to different cylinders and it still showed a misfire on #2…..

 

Well the timing might be off, get a mechanic to test the timing. Also you can try and test if the wire that leads to the coil #2 is giving off the right power.

Good Luck

 

Hey, I have a friend who is a Master Nissan tech, and say he works at a stealership. He says when it comes to coil packs, you don't just change one, you change them all. Because one bad one wil lead the others to fail. Change them all and be done with it.

 

Yeah I heard this too. I think it's a rumor but I'm not sure. I'm changing cylinder #5 tomorrow. (Code 0605)

Hopefully the other coils wont fail on me.

BTW- I heard from Nissan there was a shortage of Mitsubishi coils on the market. Mitsubishi's are the better ones. They stiffed me with a Hashin coil.

 

Well, I got the CEL and took it to me Tech, and he found that coil # 3 was mis-firing and he just replaced them ALL and no problems since. And that was last July of '04. If you replace just one, ( the bad one ), a week or two down the road, you'll sure get another one. Just my 2 cents. Good luck.

 

First, i dont know much about this issue... but im trying to troubleshoot with you. so don't give me any heat if my ideas dont make sence...

maybe im missing something, but if you moved the new coilpack,plug, and injector to different cylinders, yet the missfire still occured in cylinder #2. doesnt that tell you its a mechanical problem specific to the cylinder (like you said)

first we need to know how the ECU knows its missfiring? what is it monitoring for it to know when to report a missfire? (i'll check the FSM tomorrow) once we know that i think that will help us narrow down your problem.

but off the bat, here's what im thinking:
1) from your quote above, the problem is definatly specific to cylinder 2, so it has nothing to do with the coilpacks/plug/injector. mabye its a sticky exhaut valve? have you done compression tests?

 

i just found this:

http://www.users.bigpond.com/jack_st...n_misfire.html

 

Yeah, I also heard this, but I also heard that when the dealership does it under warranty they only replace one, but if you're out of warranty they suggest you replace them all. Funny how that works, if they have to replace it, they only do one, but if it's your buck the coils fall on, then they want to replace them all.

Brent

 

If its just the #2 coil and a random problem then what would changing all the coils do? Probably nothing.

The problem can only be one thing. The signal from the ECM to the #2 coil.

So you have to ask what tells the ECM to fire the #2 coil? that would be the POS and REF crank sensors and the 2 cam sensors. But all the other coils fire fine.

This would lead me to believe that there is a wiring problem from the #2 coil to the ECM. Its a Green/Red wire according to my wiring diagram. Maybe the wire is crimped somewhere or the connector is damaged.

Here is what I would do. I would pull the ECM harness off and check for continuity from the ECM plug to the Coil. The wire is Green/Red on both ends. While you are checking continuity, jiggle the wires in between pretty hard. You want to mimic engine movements on these wires. If the continuity breaks, then you have a wiring problem. I'd just run a new wire between these points. Make sure you check that the coil gets a good ground (black wire) and a good power (red wire). Again make sure these wires are secure and are not crimped or cut anywhere.

If continuity does not break then a bad ECM might be the culprit. Before I changed the ECM i'd go check the fuel side.

The wire to your #2 fuel injector is Red/Green. My guess is that this is a negative impulse. The positive is red. From what I can see it gets a positive signal all the time. the negative tells it when to pulse and shoot fuel.

Make sure there is a good positive (red wire) and that the wire is intact. Make sure the Red/Grn wire has continuity to the ECM. The same color wire goes there. Again try to jiggle and play with the wires to mimic engine movements.

Your problem might be a bad ECU. If you can get your hands on one as a tester... go for it.

Good luck