So..now I have a P0300

energiesource · March 10th, 2010, 06:17 PM

I'm throwing a P0300 code now, which i think is random/multiple cylinder misfire. It just started randomly and now it wont idle it just wants to die so where do i start? spark or fuel, but thats alot of checking.

Black Bullitt · March 10th, 2010, 06:18 PM

This should help.

OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected

energiesource · March 10th, 2010, 06:33 PM

well that narrows it down, but id like to narrow it down even more. i recently had some idling issues caused by a bad o2 sensor. i replaced them both and the car was running fine, and then driving it for a few hours this happened.

Black Bullitt · March 10th, 2010, 06:36 PM

Take your neg terminal off the battery for about 30 seconds and hook it back up. See if that helps at all.

energiesource · March 10th, 2010, 06:37 PM

i did that after i installed them but ill try it. it was running pretty shitty. when the light came on, it was shaking the car alot.

energiesource · March 10th, 2010, 07:12 PM

i started it up and let it idle and it runs fine now. the ses light is still on though. the engine shakes a bit but i suppose no more than it did...maybe just a fluke? anything in particular i should check

Black Bullitt · March 10th, 2010, 07:20 PM

When's the last time you checked/replaced your spark plugs? I would at least inspect each one.

energiesource · March 10th, 2010, 07:22 PM

I replaced them when i did my cams back in sept but havent driven the car this winter so there shouldnt be anything wrong with them

slikirish · March 10th, 2010, 07:25 PM

I wouldn't count that as a fluke. Most likely cause is a plug, COP, injector, or fuel filter

Black Bullitt · March 10th, 2010, 07:27 PM

How about fuel filter? A clogged fuel filter will make it a little difficult to get the correct amount of fuel. And if it sat all winter the fuel could have gone bad.

slikirish · March 10th, 2010, 07:28 PM

Missed the part about sitting all winter. Did you put any kind of fuel stabilizer in it? If not try draining the tank and filling with new

Black Bullitt · March 10th, 2010, 07:37 PM

Hopefully it's just some bad gas or fuel filter issue. Fuel filter is easy enough to replace though.

energiesource · March 10th, 2010, 07:52 PM

dont you have to take out the tank to get at the fuel filter?

Black Bullitt · March 10th, 2010, 08:01 PM

No, it's right there by the fuel tank, no need to drop the tank. Just make sure you disconnect the battery and bleed the line at the schrader valve. Or you can pull the fuse for the fuel pump and start it up until it dies to clear the lines and then disconnect the fuel lines on the fuel filter. I would recommend wearing some goggles to protect your eyes to be safe. Nothing sucks more than getting fuel in your eyes.

RyanGT · March 10th, 2010, 08:02 PM

No, its sitting under the car between the axle and tank. That is probably one of the causes if you don't know where it is (hasn't been replaced). I would definitely start there. Cheap and very easy. The butt end of our cars are fairly high up, so you might not even have to jack it up to get to it. You will need a fuel disconnecting tool.

RyanGT · March 10th, 2010, 08:04 PM

Originally Posted by Black Bullitt

No, it's right there by the fuel tank, no need to drop the tank. Just make sure you disconnect the battery and bleed the line at the schrader valve. Or you can pull the fuse for the fuel pump and start it up until it dies to clear the lines and then disconnect the fuel lines on the fuel filter. I would recommend wearing some goggles to protect your eyes to be safe. Nothing sucks more than getting fuel in your eyes.

No shit dude. It fucked up my left eye. I see in a darker color in my left eye lol. Damn pressurized gas!

Black Bullitt · March 10th, 2010, 08:06 PM

IIRC, I believe you need a 3/8s fuel disconnect tool. Or if you don't have one on hand like I did when I installed the blower for a second time on this Bullitt, you can buy a funnel and saw the tip off, cut it long way so you can wrap it around the fuel line and push in to disconnect the line. ...Isn't hillbilly ingenuity great?!

Black Bullitt · March 10th, 2010, 08:07 PM

Originally Posted by RyanGT

No shit dude. It fucked up my left eye. I see in a darker color in my left eye lol. Damn pressurized gas!

Ouch man, I think I felt that.

energiesource · March 10th, 2010, 08:07 PM

Originally Posted by RyanGT

No, its sitting under the car between the axle and tank. That is probably one of the causes if you don't know where it is (hasn't been replaced). I would definitely start there. Cheap and very easy. The butt end of our cars are fairly high up, so you might not even have to jack it up to get to it. You will need a fuel disconnecting tool.

it was replaced quite a few years ago but i suppose i should do it again.

Black Bullitt · March 10th, 2010, 08:09 PM

It couldn't hurt depending on how many miles you put on it between now and then. I replaced one on my old Bullitt when I did the blower install and when I tipped it up to drain the residual gas out of it dark fluids were coming out. It was very dirty.

March 10th, 2010, 06:17 PM	#1
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	So..now I have a P0300 I'm throwing a P0300 code now, which i think is random/multiple cylinder misfire. It just started randomly and now it wont idle it just wants to die so where do i start? spark or fuel, but thats alot of checking. __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

March 10th, 2010, 06:33 PM	#3
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	well that narrows it down, but id like to narrow it down even more. i recently had some idling issues caused by a bad o2 sensor. i replaced them both and the car was running fine, and then driving it for a few hours this happened. __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

March 10th, 2010, 06:37 PM	#5
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	i did that after i installed them but ill try it. it was running pretty shitty. when the light came on, it was shaking the car alot. __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

March 10th, 2010, 07:12 PM	#6
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	i started it up and let it idle and it runs fine now. the ses light is still on though. the engine shakes a bit but i suppose no more than it did...maybe just a fluke? anything in particular i should check __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

March 10th, 2010, 07:22 PM	#8
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	I replaced them when i did my cams back in sept but havent driven the car this winter so there shouldnt be anything wrong with them __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

March 10th, 2010, 07:25 PM	#9
slikirish Hardcore Enthusiast 2004 Mustang GT 5spd Join Date: Nov 2009 Location: Parkersburg, WV Posts: 2,663 iTrader: 0 reviews	I wouldn't count that as a fluke. Most likely cause is a plug, COP, injector, or fuel filter __________________ Mods in Garage

March 10th, 2010, 07:28 PM	#11
slikirish Hardcore Enthusiast 2004 Mustang GT 5spd Join Date: Nov 2009 Location: Parkersburg, WV Posts: 2,663 iTrader: 0 reviews	Missed the part about sitting all winter. Did you put any kind of fuel stabilizer in it? If not try draining the tank and filling with new __________________ Mods in Garage

March 10th, 2010, 07:52 PM	#13
energiesource MM Fanatic Join Date: Oct 2006 Location: Up der in canada eh Posts: 3,527 iTrader: 1 reviews	dont you have to take out the tank to get at the fuel filter? __________________ 2000 Mustang GT, 417hp/421tq, P1SC @ 6 psi(?), Custom grind cams, Steeda Triax shifter, SLP LM2, MAC L/T and O/R H-pipe. 18x9/10 Flat Black FR500's, Mach C-pillars, bullitt side scoops/skirts.

March 10th, 2010, 08:02 PM	#15
RyanGT MM Fanatic 2000 GT Join Date: Dec 2006 Location: Lynnwood, Washington Posts: 4,258 iTrader: 4 reviews	No, its sitting under the car between the axle and tank. That is probably one of the causes if you don't know where it is (hasn't been replaced). I would definitely start there. Cheap and very easy. The butt end of our cars are fairly high up, so you might not even have to jack it up to get to it. You will need a fuel disconnecting tool. __________________ 2000 Black convertible GT: KB 15psi, and other goodies... 1971 Datsun 240 z: Header and rebuilt motor. (The DD)

Remove Advertisements Sponsored Links
Forums at Modded Mustangs Advertisement Advertisement

Threads Similar to: So..now I have a P0300
Thread	Thread Starter	Forum	Replies	Last Post
P0300	mcqueen	V6 Mustangs	15	February 17th, 2010 02:42 AM

All times are GMT -4. The time now is 02:04 AM.
Contact Us - Modded Mustangs - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.