DreAded p0300
#1
Registered User
Thread Starter
DreAded p0300
I have been chasing down this misfire problem.for weeks now. Ive.done all the obvious like'm plugs , intake gaskets ,checked coils , ect. I at my Wit's End what can I do next please help me ,05' 35th Anniversary Edition stock ,spacer plate ,high-flow cats, 6speed bare minimum on the mods and a performance chip that plugs into the OBD2 port.
#3
Registered User
Thread Starter
It happens cold or hot. As soon I erase the codes it returns. Ive replaced all the intake and plenum gaskets, cleaned and replaced MAF, both o2 sensors on bank 1, and still the ahort term fuel trim is @ 25% adding fuel either in open or closed loop. The only thing I havenr done is replace the injectors. Id l : ke ro.pin point it further before shelling out the $ for injectors. Any help is welcome. I am getting 8-10 MPG TOPs and absolutely no.power .
#4
Registered User
Thread Starter
#5
New Member
Welcome - First, I would get rid of the performance chip and reset your ECU.. How many miles are on the car? Did it throw the code randomly, or after you changed something? How did you troubleshoot the plugs and coils?
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NissanTracker (11-14-2017)
#6
Registered User
Thread Starter
I have reset the ECU and it still.tripd the code right away. I have put new plugs in it twice and last.rime.one plug had the irridium tip melted. I havent checked the coils. Do.I.just.unplug them one at.a time and listen for ? Thank you for.tour feedback. Yhe coils and.injectors are m last hope in finding this problem
#7
Registered User
Thread Starter
Randomly. Nothing I have done thus far has helped or.corrrrcted the issue. Thank.You
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#8
New Member
iTrader: (1)
Can you check and log your AFR's?
If you are melting plugs you are probably leaning out burning your cylander. Also check your cats, my buddy just had his car doing the same thing we chased for months until I finally talked him into looking at the cats.
And one was clogged aka broken and was blocking the exhaust for one bank. Apparently it happens more often than not with these cars as soon as you start messing with breather mods.
All he changed was his air intake.
If you are melting plugs you are probably leaning out burning your cylander. Also check your cats, my buddy just had his car doing the same thing we chased for months until I finally talked him into looking at the cats.
And one was clogged aka broken and was blocking the exhaust for one bank. Apparently it happens more often than not with these cars as soon as you start messing with breather mods.
All he changed was his air intake.
#9
Registered User
Thread Starter
Can you check and log your AFR's?
If you are melting plugs you are probably leaning out burning your cylander. Also check your cats, my buddy just had his car doing the same thing we chased for months until I finally talked him into looking at the cats.
And one was clogged aka broken and was blocking the exhaust for one bank. Apparently it happens more often than not with these cars as soon as you start messing with breather mods.
All he changed was his air intake.
If you are melting plugs you are probably leaning out burning your cylander. Also check your cats, my buddy just had his car doing the same thing we chased for months until I finally talked him into looking at the cats.
And one was clogged aka broken and was blocking the exhaust for one bank. Apparently it happens more often than not with these cars as soon as you start messing with breather mods.
All he changed was his air intake.
#10
New Member
I have reset the ECU and it still.tripd the code right away. I have put new plugs in it twice and last.rime.one plug had the irridium tip melted. I havent checked the coils. Do.I.just.unplug them one at.a time and listen for ? Thank you for.tour feedback. Yhe coils and.injectors are m last hope in finding this problem
REMOVE THAT PERFORMANCE CHIP. THEN RESET YOUR ECU.. check back.
#11
Registered User
Thread Starter
The issue started before the chip install . The chip.actually.made a little.difference in being able.to driventhe car at all .without.the chip the car won't accelerate at all but voing out yhere now.and.try that. Thank you
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Atreyu'z 350 (11-14-2017)
The following 2 users liked this post by GreyZ:
Atreyu'z 350 (11-14-2017),
NissanTracker (11-14-2017)
#18
New Member
This makes me think you have an injector that's in a stuck open position. How many miles do you have on your car? Are you running with the factory injectors? Did your bad plug smell like gasoline?
The following users liked this post:
Atreyu'z 350 (11-14-2017)