RANDOM MISFIRE COIL(S)?
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its possible........P0300 is a generic code.....it may be a single cylinder or all of them....it would be a lot easier to tell which specific cylinder is giving you all the grief with a monitor ( scantool )....you could pull the cover and check the plugs...and see if the shell is cracked....
Or it could be a bad connection at the DIS module.... or one of the DIS modules themselves going bad... loose wire somewhere in the ignition circuit... etc.
ok answer to both of you guys question is NO
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ok im having basically same problem. Happened same way you said. here what i has happened after that happened got cel on read puter with actron scanner. got bank 1 ( forward o2 sensor) bank 2 ( rear o2 sensor) and p0300 = multipul/random missifires. and 13 day old convertor was glowing red. cleared codes pulled plugs cylender 1 and 4 were flooded with gas. so tought about what do 1&4 have in common? coils are 1&4 / 2&3 figured that was problem. guess again put on new module 2 coils boots plugs coil harness ground strap. started car ran like only on 2 cylenders. after about 1 1/2mins cel started flashing shut off car read puter again po300 multipul/random missfire again cylenders 1&4 flooded again. now if i let car run get a heavy fuel smell under the hood but no leaks present and no gas smell at rear of car. no smoke from ehaust. before this problem car was running rich for 2-3 weeks. checked timing = dead nuts vacume 19.5-20.5 in hg will do compression and spark test tomm 6/27/06 how ever suspect there will be no problems considering vacume is good no oil or anitfreeze smells or present in cylenders. i will also test resistance on injectors.
my therory at this point is possably fuel pressure regulator. thinking diaphram is stuct open? thinking leaving car in operating psi. but higher cfm? convertor glow was raw fuel hitting it right before i got to work started hearing slight pining from convertor and down pipe but when car runs now no converotor glow and o2 sensors tripped and ample exhaust exiting tail pipe. no codes other than p0300 and traction off light comes on also. have also noticed that plus from cylenders 1&4 are fouled after 1-2mins and now cylender 2&3 are wetter every time i pull them.
presently no codes but po300
any ideas guys will update status tomm afternoon
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lol that first post was my wife while i was at work looking at car lol
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doh car is a 02 z24 auto 2.4ld9 82k on it
mods are throttle body space been on car 5 months
rksport cold air intake been on car almost 4 years
magnaflow stainless free flow convertor
flowmaster 60 series stainless delta flow muffler
no resignator
pipes are mandrel bent
pipes,convertor and muffler are all 2 1/4" verses 2" stock
down pipe was cut in half to step up to 2 /14" before convertor.
please excuase all the friggen typos
thanks bryan
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I had that one, and went through the exact steps you are, coils, regulator etc, but nothing worked. Turns out it was the in tank fuel line that connects the pump to the sending unit.
problem was using a non ac delco coil housing
errrrrrrr go figure
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