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Discussion Starter · #1 ·
2012 nissan armada sl 5.6
Driving down the road when came to a stop all the sudden the cel starting blinking and idles ruff as soon as i give it gas it drives normal
all i get is a p0300 code at idle
so far what i did
1 new spark plugs
2 new coils
3 new cam shaft sensors
4 compression test in cylinders was 150 psi each
5 fuel pressure is 60 psi at idle and 51 at giving gas
6 om meter showed 12.4-12.5 on all injectors
7 removed all the old gas and cleaned the gas tank and refilled with 93 gas 5 gallons
o2 sensors have the same reading upstream
down stream the reading on bank 2 is a little behind then bank 1
when i start the made cold its starts right up and no engine light as it warms and the rpms get to about 700 the cel light starts blinking again as soon as you give it gas the blinking stops and the car starts running normal
Any help would be greatly appreciated
 

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Random misfire. I would check all the connections to make sure they are tight and the wires are intact. Might be a bad coil pack?


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Discussion Starter · #3 ·
Random misfire. I would check all the connections to make sure they are tight and the wires are intact. Might be a bad coil pack?


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i checked two times and i swapped out new coil foe new coils just to be a 100% sure
 

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go back and re check your steps. make sure you did not inadvertently disconnect something or bend a wire, etc causing intermittent continuity. based on your post, you handled a lot of items and its possible something could have gotten damaged.

also, maybe a part could be faulty. ive seen it happen on this forum after someone chased their tail on it.

you could have an air leak in the intake. could be the MAF. maybe the petrol tank filter screen/pump could be an issue.
 

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Discussion Starter · #5 ·
go back and re check your steps. make sure you did not inadvertently disconnect something or bend a wire, etc causing intermittent continuity. based on your post, you handled a lot of items and its possible something could have gotten damaged.

also, maybe a part could be faulty. ive seen it happen on this forum after someone chased their tail on it.

you could have an air leak in the intake. could be the MAF. maybe the petrol tank filter screen/pump could be an issue.
i smoked the intake system to make sure there no vacuum leaks, I've checked everything over and over again, i just finished replacing the fuel pump to be 100% sure nothing i blocked anywhere
 

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Did you do all those items before or after the CEL came on? Have you looked up what code P300 is? If it's ignition related, one of the first things I usually do is remove the mass air sensor and clean it, must be specifically MAF cleaner only. Then clear the code with a reader and see if it comes back. Either way the MAF has a tendency to get oily over time and the oil can be an insulator on the hot wire and cause poor running conditions, especially at idle.
 

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I had an issue just like this after doing headers and tune. Don't know when exactly it started. Replaced one component at a time cleared the code and when it came back, replaced another component. Ended up being a fuel injector, so replaced all of them with a set from amazon, cheaper than the best ones, but no codes after nearly 2 years. Problem with P0300 is that it is really RANDOM. My regular mechanic said not to worry about it until it shows its ugly face as a specific code. NOTE: It had NOTHING to do with the headers and tune. "If its glowing keep on going, if its blinking better start thinking"
 

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Discussion Starter · #8 ·
Did you do all those items before or after the CEL came on? Have you looked up what code P300 is? If it's ignition related, one of the first things I usually do is remove the mass air sensor and clean it, must be specifically MAF cleaner only. Then clear the code with a reader and see if it comes back. Either way the MAF has a tendency to get oily over time and the oil can be an insulator on the hot wire and cause poor running conditions, especially at idle.
Did you do all those items before or after the CEL came on? Have you looked up what code P300 is? If it's ignition related, one of the first things I usually do is remove the mass air sensor and clean it, must be specifically MAF cleaner only. Then clear the code with a reader and see if it comes back. Either way the MAF has a tendency to get oily over time and the oil can be an insulator on the hot wire and cause poor running conditions, especially at idle.
i did everything after the check engine light came on, the code is a multi cylinder misfire and I've cleaned the map sensor, i clear it when starting the car is idles ruff and after a few minutes the engine light starts to blink

I had an issue just like this after doing headers and tune. Don't know when exactly it started. Replaced one component at a time cleared the code and when it came back, replaced another component. Ended up being a fuel injector, so replaced all of them with a set from amazon, cheaper than the best ones, but no codes after nearly 2 years. Problem with P0300 is that it is really RANDOM. My regular mechanic said not to worry about it until it shows its ugly face as a specific code. NOTE: It had NOTHING to do with the headers and tune. "If its glowing keep on going, if its blinking better start thinking"
i checked the reading on the fuel injectors and they all seem to be in working shape and I've listened to them to make sure they work, the only thing i cant check is if they clogged
 

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Have you driven the vehicle until it gets up to operating temp? Any changes in the running condition from cold start and up to full temp? If it just happens while the engine is cold or hot you can narrow down potential sensor issues related to those functions, if it is a sensor.

Or, this:
go back and re check your steps. make sure you did not inadvertently disconnect something or bend a wire, etc causing intermittent continuity. based on your post, you handled a lot of items and its possible something could have gotten damaged.

also, maybe a part could be faulty. ive seen it happen on this forum after someone chased their tail on it.

you could have an air leak in the intake. could be the MAF. maybe the petrol tank filter screen/pump could be an issue.
maybe even a cracked hose. Vacuum leaks can cause rough cold idle conditions and rich mixtures while warm and idling. All can throw a CEL code.
 

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Discussion Starter · #10 ·
so I replaced the fuel injectors and nothing at all has changed, when you first start the car it’s runs fine as it starts to warm up around 600-700 rpms the check engine lights starts to blink and feels ruff, as soon as I touch the gas paddle the check engine stops blinking and it runs perfectly fine till the rpms come back down, the only 2 weird thing I see on live data is the maf sensor is reading 8.5 instead of 1-7 and b2s2 is reading in mid 40s unlike b1s1 readying mid 70s, I checked and rechecked again and again and everything looks good but it’s running ruff and idle

Have you driven the vehicle until it gets up to operating temp? Any changes in the running condition from cold start and up to full temp? If it just happens while the engine is cold or hot you can narrow down potential sensor issues related to those functions, if it is a sensor.

Or, this:


maybe even a cracked hose. Vacuum leaks can cause rough cold idle conditions and rich mixtures while warm and idling. All can throw a CEL code.
I smoked tested all the vacuum lines and nothing anywhere

I had an issue just like this after doing headers and tune. Don't know when exactly it started. Replaced one component at a time cleared the code and when it came back, replaced another component. Ended up being a fuel injector, so replaced all of them with a set from amazon, cheaper than the best ones, but no codes after nearly 2 years. Problem with P0300 is that it is really RANDOM. My regular mechanic said not to worry about it until it shows its ugly face as a specific code. NOTE: It had NOTHING to do with the headers and tune. "If its glowing keep on going, if its blinking better start thinking"
Replaced all the injectors with Amazon injectors with no changes
 

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Replace the entire boot that attach to each coil, they tend to crack over time and get brittle. Also they are easily damaged against the spark plug; avoid wiggling them much when removing and replacing. The most tiny crack will make your spark jump to ground therefore missfiring and throwing code(s). I had this problem on my pathfinder. After replacing all boots problem went away. Coils rarely go bad
 
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