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Old 04-30-2012, 06:27 PM   Thread Starter #1
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Default P0300 (Multiple Cyl. Misfire) Issues

So I've been working on a 04 6spd Max for a member (@Surren). I'm only getting code P0300. Coil packs were changed along with spark plugs from another shop. I checked for vacuum leaks, installed new intake gaskets, cleaned the MAF also check fuel pressure, which is low at 40-45 psi, spec is approx. 51psi. Did a performance test on all injectors and are working properly. Tested resistance on A/F sensors, one reads 5 ohms (B2) other reads 4 ohms, compression tests show all cylinders to be within spec (170 each). Today I found the Y-pipe to be clogged up with debris from the catalytic. Once I cleaned that up and clear the Y-pipe I got all the power back from the engine and she ran great. I'm stumped and feeling defeated. Lol. Open for suggestions!! Not sure if its the fuel pump because pressure is low but I dont wanna throw parts at it and be wrong, jus not my way of working plus not my money.
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Old 04-30-2012, 08:55 PM   #2
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Too possibilities here :

1. your piston rings are seizing and can't move freely while under load because of the catalytic material in the rings....while the engine is running.gopen oil fill cap...I bet you will see a lot of blowby as well as the dipstick....

2.Check your Egr... Egr stuckopen or seizing will throw a Po300 multiple missfire code.its plugged with all the catalytic material...before you go and unbolt it, just bypass the Egr by plugging behind the flange where it bolts to the intake. She should run a better...unless its the rings..

Sometimes to free up the rings kind of an option is to run ATF through the engine for 15 min or so then drain and fill with oil...ATF has a lot of detergent properties in it....you might want to do that a couple times....

Same thing happened to my motor..04 6Mt
The damage was too extensive though. I did a motor swap after all.
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Old 04-30-2012, 10:05 PM   #3
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Thanks for the feedback bro! ^^
Good Looking out on the threat Mr. $
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Old 05-01-2012, 08:05 AM   Thread Starter #4
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Danski, the car is running great but jus before the light pops up, u feel the hesitation and the shake. Your saying to plug the intake where the egr pipe goes? Would the seized piston rings make a noise? I appreciate the help.
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Old 05-01-2012, 03:40 PM   #5
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Yea, plug it at the intake...piston rings being stuck will show themselves by smoke coming out of the exhaust under throttle application. What kind of noise are you experiencing?
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Old 05-01-2012, 04:35 PM   #6
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

If you had a seized piston ring, you would feel the motor shake real bad, and it would not start up strong like you are saying, and then go into hesitation, it would run as if a coil pack was gone or missing a plug. Make sure the plugs that were put in are in fact the correct ones, as Danski said, plug the EGR at the intake, and see if it still does the same symptoms. To get the P0300 code, you already know it is a multiple cylinder misfire issue, so double check everything, for intake air leaks, even the pcv valve. Since you are stating that the fuel pressure is low, I am guessing that that might be the problem. Give me a call, and I will connect cipher to it and we can check the parameter while it is running, and probably do a log and compare the numbers.
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Old 05-02-2012, 10:00 AM   Thread Starter #7
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by Danski6MT View Post
Yea, plug it at the intake...piston rings being stuck will show themselves by smoke coming out of the exhaust under throttle application. What kind of noise are you experiencing?
OK. No smoke or any noise out of the ordinary. The car runs strong since clearing the y pipe. I'll try that egr thing today.
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Old 05-02-2012, 10:06 AM   Thread Starter #8
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by 05vk56 View Post
If you had a seized piston ring, you would feel the motor shake real bad, and it would not start up strong like you are saying, and then go into hesitation, it would run as if a coil pack was gone or missing a plug. Make sure the plugs that were put in are in fact the correct ones, as Danski said, plug the EGR at the intake, and see if it still does the same symptoms. To get the P0300 code, you already know it is a multiple cylinder misfire issue, so double check everything, for intake air leaks, even the pcv valve. Since you are stating that the fuel pressure is low, I am guessing that that might be the problem. Give me a call, and I will connect cipher to it and we can check the parameter while it is running, and probably do a log and compare the numbers.
I ran a log (freeze frame data) using Consult II. A/F B1 show around 1.55v but A/F B2 shows around 1.20v. O2 B1 reads around .90v and O2 B2 is completely dead reading .02 with no fluctuation at all. I'm very confident with doing my test and Freeze Frame Data from Consult II that the issue is in Bank 2. I'm going to replace Catalytic and sensors because it needs it due to them being broken down but I have a hunch it may be the issue.
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Old 05-02-2012, 11:59 AM   #9
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by Mr DoLLa View Post
I ran a log (freeze frame data) using Consult II. A/F B1 show around 1.55v but A/F B2 shows around 1.20v. O2 B1 reads around .90v and O2 B2 is completely dead reading .02 with no fluctuation at all. I'm very confident with doing my test and Freeze Frame Data from Consult II that the issue is in Bank 2. I'm going to replace Catalytic and sensors because it needs it due to them being broken down but I have a hunch it may be the issue.
That's a good start. Your bank 2 is showing lean...as they should be in the range of 1.3-1.6V fluctuation....this could be ineither due to the fact that the a/f sensor is going bad or injectors(although you tested injectors....hopeful its just the sensor....Also make sure you reset the ECM either through consult or manually when you change the primary a/f on bank 2.
Your rear HO2s1 and HO2s2 have nothing to do with performance as they are there to monitor catalytic efficiency...good to replace them but those have nothing to do with P300 code....as they are for emission police purposes...wink wink
Keep us updated.
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Old 05-09-2012, 08:56 PM   Thread Starter #10
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Update! Replaced cats and sensors and problem solved. Catalytic was in pieces and sensors were malfunctioning. @Surren is loving the drive right now. Thanks for the help everyone.
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Old 05-09-2012, 09:03 PM   #11
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

You gotta love the org
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Old 05-09-2012, 09:10 PM   #12
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Nice!
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Old 05-09-2012, 11:41 PM   #13
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

That's good news, who needs Nissan when you have My6thgen.org .
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Old 05-13-2012, 09:10 AM   #14
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Finally!!! I get to feel what the hype behind the VQ 6spd is all about!

Shoutout to Mr. Dolla for all the hard work and patience!
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Old 08-03-2012, 12:53 PM   #15
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

I dont have a Cat and im having the same problem
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Old 08-04-2012, 12:22 AM   #16
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by RalphMaxima04 View Post
I dont have a Cat and im having the same problem
How knowledgeable are you with cars, and if so, what have you done so far?
Also, are you running headers or gutted cats?
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Old 08-04-2012, 09:42 AM   #17
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

I'm very knowledgeable with cars, so far i have changed the gaskets cuz they were bad and spark plugs also, i'm finishing the rear part today gotta take off manifold, furthermore my dad is a certified mechanic,and i'm running stock headers and y pipe but with full cat back exhaust.?? inaddition i was also getting code P0021 hope it can help @Danski6MT
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Old 08-04-2012, 10:17 AM   #18
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by RalphMaxima04 View Post
I'm very knowledgeable with cars, so far i have changed the gaskets cuz they were bad and spark plugs also, i'm finishing the rear part today gotta take off manifold, furthermore my dad is a certified mechanic,and i'm running stock headers and y pipe but with full cat back exhaust.?? inaddition i was also getting code P0021 hope it can help @Danski6MT
P0021 is a code for IVT solenoid for bank 2. (bank on radiator side) this explains your missfire. Your ECM has no idea of the relation of the intake cam on bank 2.
This could also be related to your cam position sensor. What I would do first is swap cam position sensors from bank 1 to bank 2. Clear DTC and start the engine. If a DTC P0011 gets set (IVT solenoid for bank 1) then you have a bad cam position sensor. Replace the sensor with genuine Nissan sensor. If same code gets triggered P0021 then its most likely IVT solenoid.
Also, make sure you visually inspect the end of the cams with a mirror and a flashlight through the sensor hole once you remove the cam sensors. Sometimes you might have debris in the cam phase wheel sending a misleading cam phase input to ECM.
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Old 08-04-2012, 11:11 AM   #19
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by Danski6MT View Post
P0021 is a code for IVT solenoid for bank 2. (bank on radiator side) this explains your missfire. Your ECM has no idea of the relation of the intake cam on bank 2.
This could also be related to your cam position sensor. What I would do first is swap cam position sensors from bank 1 to bank 2. Clear DTC and start the engine. If a DTC P0011 gets set (IVT solenoid for bank 1) then you have a bad cam position sensor. Replace the sensor with genuine Nissan sensor. If same code gets triggered P0021 then its most likely IVT solenoid.
Also, make sure you visually inspect the end of the cams with a mirror and a flashlight through the sensor hole once you remove the cam sensors. Sometimes you might have debris in the cam phase wheel sending a misleading cam phase input to ECM.
gonna try it right now ill keep you posted thanks!
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Old 08-05-2012, 12:41 PM   #20
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by Danski6MT View Post
P0021 is a code for IVT solenoid for bank 2. (bank on radiator side) this explains your missfire. Your ECM has no idea of the relation of the intake cam on bank 2.
This could also be related to your cam position sensor. What I would do first is swap cam position sensors from bank 1 to bank 2. Clear DTC and start the engine. If a DTC P0011 gets set (IVT solenoid for bank 1) then you have a bad cam position sensor. Replace the sensor with genuine Nissan sensor. If same code gets triggered P0021 then its most likely IVT solenoid.
Also, make sure you visually inspect the end of the cams with a mirror and a flashlight through the sensor hole once you remove the cam sensors. Sometimes you might have debris in the cam phase wheel sending a misleading cam phase input to ECM.
SO!! i went and did what you said, but the Cam shaft senor arent the same, so i took them out and cleaned them checked everything while i had the valve covers off.everything was clean no debis, put everything back and i still gives me the code now i got a NEW one P0403 FML any Nissan mechanics in MIAMI???
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Old 08-05-2012, 02:11 PM   #21
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by RalphMaxima04 View Post
SO!! i went and did what you said, but the Cam shaft senor arent the same, so i took them out and cleaned them checked everything while i had the valve covers off.everything was clean no debis, put everything back and i still gives me the code now i got a NEW one P0403 FML any Nissan mechanics in MIAMI???
The difference between the sensors should be the locations of the plugs. One tab plugs in straight and one plugs in at a 90 degree. Sensors are both (Phase) and work of the same values. Are you saying you were not able to plug them in...?
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Your code P0403 is for your EGR. >>This could also be a reason for a missfire if the egr is stuck open...... You could bypass the egr (right at the intake) by placing a piece of metal ( a piece of coke can) that you cut out with scizzors as if you were making a gasket but instead it would restrict flow from your intake.

Another thing Iam a little confused about is the fact where you stated you are running stock headers but you dont have a cat.....? care to explain this a little bit more?
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Old 08-05-2012, 02:38 PM   #22
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Default Re: P0300 (Multiple Cyl. Misfire) Issues

Originally Posted by Danski6MT View Post
The difference between the sensors should be the locations of the plugs. One tab plugs in straight and one plugs in at a 90 degree. Sensors are both (Phase) and work of the same values. Are you saying you were not able to plug them in...?
Here is the pic:

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Your code P0403 is for your EGR. >>This could also be a reason for a missfire if the egr is stuck open...... You could bypass the egr (right at the intake) by placing a piece of metal ( a piece of coke can) that you cut out with scizzors as if you were making a gasket but instead it would restrict flow from your intake.

Another thing Iam a little confused about is the fact where you stated you are running stock headers but you dont have a cat.....? care to explain this a little bit more?
I fixed Code P0430, Clip is messed up (tyraped it meanwhile and now the only code i have is P0021 so Im just gonna buy both sensors
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