SES code P0300
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so i have seen a lot of people with this code P0300 but people don't follow up with updates.
my car is a 2003 track with 107,000 miles. everything is stock. oil changed in the last few hundred miles.
symptoms of the car are: when the car is fully warmed up, you can feel vibration through the shifter and a light popping sound through the exhaust. when i start the car from a cold start, it has no vibration and no pop, but as soon as the car warms up and the idle drops to the 650 mark, the car starts to vibrate and pop. no smoke or smell from the exhaust.
while i was driving one day, the ses light started blinking. so i took the car to o'reilly's to get the code read. it came up as P0300 random misfire. i got some ngk premium platinum spark plugs to see if it were the plugs. that didn't fix the problem. i got the code cleared and put some stp fuel treatment in the car and right away the car stopped vibrating and stopped popping. drove normal again but that only lasted for a day.
the old plugs all looked the same and fine. so i'm guessing the injectors are ok too. the coil packs are good too. maf and tb cleaned. i did notice the throttle plate wasn't closed fully when the car was off. like the plate is not completely vertical. i don't know what else might be the problem.
does anybody know a good shop around Portland/Vancouver area that works on z's?
thank you guys for reading.
my car is a 2003 track with 107,000 miles. everything is stock. oil changed in the last few hundred miles.
symptoms of the car are: when the car is fully warmed up, you can feel vibration through the shifter and a light popping sound through the exhaust. when i start the car from a cold start, it has no vibration and no pop, but as soon as the car warms up and the idle drops to the 650 mark, the car starts to vibrate and pop. no smoke or smell from the exhaust.
while i was driving one day, the ses light started blinking. so i took the car to o'reilly's to get the code read. it came up as P0300 random misfire. i got some ngk premium platinum spark plugs to see if it were the plugs. that didn't fix the problem. i got the code cleared and put some stp fuel treatment in the car and right away the car stopped vibrating and stopped popping. drove normal again but that only lasted for a day.
the old plugs all looked the same and fine. so i'm guessing the injectors are ok too. the coil packs are good too. maf and tb cleaned. i did notice the throttle plate wasn't closed fully when the car was off. like the plate is not completely vertical. i don't know what else might be the problem.
does anybody know a good shop around Portland/Vancouver area that works on z's?
thank you guys for reading.
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so today i ran some seafoam in the gas tank and did the ecu reset. code never came back and car's been running fine. maybe the injectors were kinda dirty? or the gas in the car was bad? i will keep this thread updated.
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so yesterday I had the ses light checked again. finally I was able to get p0305 and p0300. now I can look in to cylinder 5 to see what's going on. the misfire is still intermittent though. I would have the light on the dash steady but the car will drive fine.
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so I heard coilpacks usually have an underload problem instead of a constant problem. if that's true then that might be my problem. sometimes when I'm cruising, when I get to an incline, the car will drop a cylinder, then the car will smooth out when I'm not climbing anymore.
anybody got oem coilpacks for sale?
anybody got oem coilpacks for sale?
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I have the same problem with p0304 instead. I have changed the plugs and still ses light still on. Next I'm swapping out the coils and see if the code moves
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had the same problem my buddy at nissan put his scanner on it and was able to determine it was a coil pack. he can turn packs off one by one. a scanner at orielys will give a multiple reasons but nothing clear. the only bad thing is once u change one coil pack they others seems to follow one by one. i was stomped for the longest time almost wasted time and money on useless parts..best thing to do is to take it to the dealer and find out ur problem for sure. hope this helps.
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Hmmm I check periodically after every oil change and there are never stored or pending codes. Had the car for like 20k miles.. never had it effect driving.
From what Ive researched it's common with the z and has something to do with a fuel hose or something.
From what Ive researched it's common with the z and has something to do with a fuel hose or something.
Last edited by oldschool350z; 07-21-2013 at 07:53 AM.