P0306 Cyl 6 Misfire w/ 2nd NEW COIL???
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
Ok I just changed the O2 sensor,
and I also used the multimeter to check the plug that goes into the coil, and it appars to produce the same voltage as the others.
So I will see how it drives to class tonight, then go for the injector in the morning.
and I also used the multimeter to check the plug that goes into the coil, and it appars to produce the same voltage as the others.
So I will see how it drives to class tonight, then go for the injector in the morning.
I take it you got the SES code for it again(?). I know it might sound trivial, I hope the coil you have replaced is the right one, cylinder locations are:
1 3 5
2 4 6
I guess you are down to items 3, 4 and 8. Also check the wiring (harness) integrity going to the coil #6. You may need to take off some insulation to do it...
Have you swapped the suspect coil # 6 with another coil, say #4 and does the misfire follow the coil? If the misfire stays on #6 then look at the items I mentioned, if it does follow the coil then your coil is gone...
1 3 5
2 4 6
I guess you are down to items 3, 4 and 8. Also check the wiring (harness) integrity going to the coil #6. You may need to take off some insulation to do it...
Have you swapped the suspect coil # 6 with another coil, say #4 and does the misfire follow the coil? If the misfire stays on #6 then look at the items I mentioned, if it does follow the coil then your coil is gone...
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
Originally Posted by igzy
I take it you got the SES code for it again(?). I know it might sound trivial, I hope the coil you have replaced is the right one, cylinder locations are:yes i have the right one
1 3 5
2 4 6
I guess you are down to items 3, 4 and 8. Also check the wiring (harness) integrity going to the coil #6. You may need to take off some insulation to do it... did this its not the wires
Have you swapped the suspect coil # 6 with another coil, say #4 and does the misfire follow the coil? If the misfire stays on #6 then look at the items I mentioned, if it does follow the coil then your coil is gone.did this, it's not the coil..
1 3 5
2 4 6
I guess you are down to items 3, 4 and 8. Also check the wiring (harness) integrity going to the coil #6. You may need to take off some insulation to do it... did this its not the wires
Have you swapped the suspect coil # 6 with another coil, say #4 and does the misfire follow the coil? If the misfire stays on #6 then look at the items I mentioned, if it does follow the coil then your coil is gone.did this, it's not the coil..
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
this is the code I am getting now,
and as far as the fuel system (ie. Fuel filter, pressure) or the pre-cat or cat, I can't see how one of these could affect specifically Cyl #6, this is why I am really leaning toward the injector.
What about that fuel map upgrade for the ECM that your supposed to get done after replacing the MAF?
this is the code I am getting now,
and as far as the fuel system (ie. Fuel filter, pressure) or the pre-cat or cat, I can't see how one of these could affect specifically Cyl #6, this is why I am really leaning toward the injector.
What about that fuel map upgrade for the ECM that your supposed to get done after replacing the MAF?
MAF and updated fuel map won't make much of a difference in your case... You could go for either the pre/main cat and/or the injector... Injector could cause cat failure... I mentioned how you can check for a leaking injector...
Just turn it to ACC position, without starting the car...
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
ok, have you ever tried to take out the injector to see if it drips?
you can not pull the injector out without unhooking it from the fuel pipe thing, and therefore you can not check to see if fuel drips out of it
you can not pull the injector out without unhooking it from the fuel pipe thing, and therefore you can not check to see if fuel drips out of it
It could be a check for shorts between the two... Check if the resistance is low, if it is then there would be a short in the injector... I can look it up in the manual though you would need to wait till Monday for it 
Did you check for the spark out of the coil and plug together? This would be to verify the integrity of the wiring to the coil...
Did you check for the spark out of the coil and plug together? This would be to verify the integrity of the wiring to the coil...
I found some info, the resistance across the injector connector terminals should be 13.5-17.5 Ohms measured at 20C (68F). This is on the injector itself...
You could also measure the voltage at the harness going to injector while the car is running and on terminal 1 of the harness the voltage should be battery voltage (12V)...
That is as far as testing the injector goes with ohm meter. Otherwise, there as some tests with Consult II that can be done to see the opening and closing of the injector. The other test is the drip test we talked about...
You could also measure the voltage at the harness going to injector while the car is running and on terminal 1 of the harness the voltage should be battery voltage (12V)...
That is as far as testing the injector goes with ohm meter. Otherwise, there as some tests with Consult II that can be done to see the opening and closing of the injector. The other test is the drip test we talked about...
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
Originally Posted by mjk
updates???
Anyway, after the new O2 sensor (upstream) and a bottle of fuel injector cleaner, my car was running alot better, if it was misfiring you couldn't even tell. UNTIL about three days ago, it is really bad again..
One thing I find interesting, is that it only happens in the lower RPM's when strain is applied to the engine (eg. when I shift into drive or reverse with my foot on the brake, but not when in park or neutral)
Originally Posted by dafertilizer
Why you got the same thing goin on??
Anyway, after the new O2 sensor (upstream) and a bottle of fuel injector cleaner, my car was running alot better, if it was misfiring you couldn't even tell. UNTIL about three days ago, it is really bad again..
One thing I find interesting, is that it only happens in the lower RPM's when strain is applied to the engine (eg. when I shift into drive or reverse with my foot on the brake, but not when in park or neutral)
Anyway, after the new O2 sensor (upstream) and a bottle of fuel injector cleaner, my car was running alot better, if it was misfiring you couldn't even tell. UNTIL about three days ago, it is really bad again..
One thing I find interesting, is that it only happens in the lower RPM's when strain is applied to the engine (eg. when I shift into drive or reverse with my foot on the brake, but not when in park or neutral)
Originally Posted by dafertilizer
Why you got the same thing goin on??
Anyway, after the new O2 sensor (upstream) and a bottle of fuel injector cleaner, my car was running alot better, if it was misfiring you couldn't even tell. UNTIL about three days ago, it is really bad again..
One thing I find interesting, is that it only happens in the lower RPM's when strain is applied to the engine (eg. when I shift into drive or reverse with my foot on the brake, but not when in park or neutral)
Anyway, after the new O2 sensor (upstream) and a bottle of fuel injector cleaner, my car was running alot better, if it was misfiring you couldn't even tell. UNTIL about three days ago, it is really bad again..
One thing I find interesting, is that it only happens in the lower RPM's when strain is applied to the engine (eg. when I shift into drive or reverse with my foot on the brake, but not when in park or neutral)
Check this thread out:
http://forums.maxima.org/showthread.php?t=454860
http://forums.maxima.org/showthread.php?t=454860
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
Originally Posted by mjk
similar, but not the same. I'm getting multiple, I fixed my single cylinder mmisfire, and now Since I bounced off redline while sparying n2o I got multiple. Problem is taht car runs fine from time to time....
P0420 = reprogramming of ECM.
P0430 = front pre cat might need to be replaced.
P0135 = check your ECM connection, more than likely, the plug may be backing out of may have been slightly dislodged from its fully seated position.
Granted you have less than 80,000 miles, 420/430 should be covered.
As for having another misfire code, you may need a new EGI harness.
Leave the car running and pull up and down on the harness on passenger rear side of motor that goes into
firewall. Its a common problem.
P0430 = front pre cat might need to be replaced.
P0135 = check your ECM connection, more than likely, the plug may be backing out of may have been slightly dislodged from its fully seated position.
Granted you have less than 80,000 miles, 420/430 should be covered.
As for having another misfire code, you may need a new EGI harness.
Leave the car running and pull up and down on the harness on passenger rear side of motor that goes into
firewall. Its a common problem.
Newbie - Just Registered
Joined: Feb 2006
Posts: 1
02 Sensor OBD Codes Detected
I am considering changing out an O2 sensor based on the symptoms stated below (which one?)
Anyone know of source for cheap O2 sensors?
Other ideas, path forward?
2000 Nissan Maxima GLE
Made in Japan for California (March 2000)
Currently has 100,000 miles
No major mechanical, electrical or computer events in its history (until now)
Began experiencing intermittent missing on a cylinder at around 75,000 mi.
The service engine light came on/off intermittently in parallel
The missing and appearance of the service engine light coming on/off became more frequent as time went by
Only recently checked the diagnostics and had the following codes:
1) P0138 02 Sensor Circuit High Voltage (Bank I Sensor 2)
2) P0139 Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)
3) P0306 Code - Cylinder #6 cylinder misfire
4) P0430 Catalyst System Efficiency Below Threshold (Bank 2)
I recently had the #2 cylinder coil changed out and installed new spark plugs.
Anyone know of source for cheap O2 sensors?
Other ideas, path forward?
2000 Nissan Maxima GLE
Made in Japan for California (March 2000)
Currently has 100,000 miles
No major mechanical, electrical or computer events in its history (until now)
Began experiencing intermittent missing on a cylinder at around 75,000 mi.
The service engine light came on/off intermittently in parallel
The missing and appearance of the service engine light coming on/off became more frequent as time went by
Only recently checked the diagnostics and had the following codes:
1) P0138 02 Sensor Circuit High Voltage (Bank I Sensor 2)
2) P0139 Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)
3) P0306 Code - Cylinder #6 cylinder misfire
4) P0430 Catalyst System Efficiency Below Threshold (Bank 2)
I recently had the #2 cylinder coil changed out and installed new spark plugs.
I think you will find most of your answers in this thread and if you go through stickies on the 5th gen forum main page, there is one called "GOT Check Engine Light?!? WHAT should you do?", look at that one too...
Otherwise I think you should have gone to the dealer at 75K to get your cat replaced under emissions warranty (8yrs/80K). You may need a new cat, rear sensor and coil #6...
Otherwise I think you should have gone to the dealer at 75K to get your cat replaced under emissions warranty (8yrs/80K). You may need a new cat, rear sensor and coil #6...
Thread Starter
Joined: Dec 2005
Posts: 606
From: Atlantic City, NJ
Originally Posted by nismo_star
P0420 = reprogramming of ECM.
P0430 = front pre cat might need to be replaced.
P0135 = check your ECM connection, more than likely, the plug may be backing out of may have been slightly dislodged from its fully seated position.
Granted you have less than 80,000 miles, 420/430 should be covered.
As for having another misfire code, you may need a new EGI harness.
Leave the car running and pull up and down on the harness on passenger rear side of motor that goes into
firewall. Its a common problem.
P0430 = front pre cat might need to be replaced.
P0135 = check your ECM connection, more than likely, the plug may be backing out of may have been slightly dislodged from its fully seated position.
Granted you have less than 80,000 miles, 420/430 should be covered.
As for having another misfire code, you may need a new EGI harness.
Leave the car running and pull up and down on the harness on passenger rear side of motor that goes into
firewall. Its a common problem.
I do keep getting the p0420, but I thought it was the inefficiency of the misfire making the code come up, I'll have to check the ECM
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