what is the air fuel reading?
Next thing to check is injectors.
If you run too lean 25% or more you will throw random misfire as well along with lean running condition perhaps. (vacum leak)
Did you replace IM gasket?
DO you get a missfire cylinder nr? If you do swap injectors and see if it follows it.
Also a clogged cat could cause it (less likely)
My issue was the whole engine harness was fried they replaced it and one of the connections for the cylinders might be loose.
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Blacked out 02 headlights,15% tint, 18" rims 245/40/18 Federal tires,Fstb,Gab Mod with K&n,Highflow cat, warpspeed y-pipe,17* advance.
Daily Driver:2000 Maxima
New Weekend Warrior: 1991 300zx 5spd
mine went away when I swapped my ssac headers to cattman headers, i had a nasty exhaust leak, and one of my o2 sensor wires had become disconnected.. dunno if it was one or the other but the car has been running so smooth ever since and no more P0300.
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'02 Maxima SE 6spd : 2.27 60ft - 13.9 @ 101mph - 8/8/08 8pm - Texas Motorplex, Ennis, TX - DA: 2800ft
[ PR CAi | CM Headers | Exedy Clutch | Tokico Illuminas | Progress Springs | 18" SSR Type C | ES MM's | 17* BTDC | 6G 6MT Trans ]
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2003 Nissan Maxima SE - Majectic Blue 6MT HLSD Meridan Edition, Titanium Editon-Dynoed 206.61whp and 219.54wtq...Stock 17 Degree Timing Advance*Apexi/Berk Short Ram Intake*Cattspeed Y-pipe*Cattman 2.5 B-Pipe*HKS Sport Exhaust*Cattman Ti FSTB*Progress RSB*ES Poly Front Sway Bar Bushings*HKS Grounding kit*Axxtion STS
bringin back this old thread. i have pm'd zero about this. i get p0300 random missfire code a lot lately. dono wat it can be. i have new plugs and manifold spacers. theres no leak or anything. looks like ima have to check the injectors. crank sensor really? hmmm
i got a feeling it might be injectors. the car doesnt seem to miss.. maybe once in awhile itll backfire. for the most part its not doing it. this damn ethanol in the fuel might be slowly killing the injectors. im leaning toward maf or injectors.. this sucks dude. if ima do injectors i may as well swap for beefier valve gaskets..
aight so I have a 00 max and it started shuttering about 3 weeks ago. Since then i have replaced spark plugs, coil pack, 02 sensor (bank 1, sensor 1), I have good air flow out of the exhaust, and I cleaned the MAF. Now all I am getting as far as codes is random misfire (p0300) and bad MAP sensor. I know the MAP has something to do with air/gas so could this be the problem, it cost like $142 so I just want to be sure before I go to spending even more money, because I thought all the "listed above" would fix it. So what do ya'll think?
i'd say that you ave a small vacuum leak. everyone seems to overlook the fact that our manifold gaskets can become brittle and cause tiny leaks. any air getting into the engine after the maf will cause a lean code. when you replaced the plugs did you replace the gaskets? was the rubber soft or brittle?
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6spd | HLSD | I/H/E & FC | Stillen FSTB & RSB | Eibach Pro Kit | Illuminas | Watkins STS | UDP | NWP Spacers | Greddy Blue | ES Bushings
I didn't remove the manifold when I replaced the plugs on bank 1 (closest to firewall), so no I didn't replace them and don't know if they are brittle or soft. Wouldn't I here a suction noise if there was a vacuum leak? If so what sound would I listen for?
if it's a pinhole leak I doubt you would here it. check with Dave B for prices, or courtesy nissan has a website as well. there are 3 gaskets which could be suspect
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6spd | HLSD | I/H/E & FC | Stillen FSTB & RSB | Eibach Pro Kit | Illuminas | Watkins STS | UDP | NWP Spacers | Greddy Blue | ES Bushings
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