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Old 04-21-2011, 11:58 AM
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p0300 code

Ok so i have a 5.4 2006 xlt, i have 120k on the motor. I had new plugs put in(no plugs cracked), and i did the coils. After the work was done p0300 came up i put new coils in angain, cleaned the air filter(amsoil dry filter), and i replaced my fuel filter about 30,000 miles ago. Should i pull all the plugs and put new ones in.
Any ideas on how to fix this?
Thanks yall
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  #2  
Old 04-21-2011, 03:51 PM
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wait until you get the p030x code that identifies the cylinder. Do you have a noticeable miss? What plugs did you use? I'd get it to give the cylinder code if it were me before you throw any thing else at it..
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  #3  
Old 04-21-2011, 09:34 PM
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P0300 code indicates random misfires and I've only seen it with more than 1 cyclinder. A single Cylinder should throw a single P030x without a P0300.
Jethat is right..wait to see what hatches.

JETHAT--like that MACH1 there. I have a 71 in my garage listing but not stock looking..
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Old 04-21-2011, 10:48 PM
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Yep, -PO300 "Random Misfire" just informs the tech to mode 6 it, - the info is recorded in cylinder history. Does us absolutely no good, we don't have that $10,000 diagnostic equipment to read it's mind...

I'd push the engine until the CEL blinks 5 or 6 times. Once that happens, do this one more time, - maybe the scanner will give you better direction once that's been achieved. It's worked in the past.

Otherwise, it's off to the dealership.
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  #5  
Old 04-23-2011, 01:42 AM
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ok so i worked the hell out of the truck still just p0300. At idle you can tell that its missin, i used the champions.
Well i dont know think i might have to end up bringing the truck to a shop

thanks yall
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Old 04-23-2011, 01:51 AM
glc glc is offline
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You may want to pull the Champions out and put Motorcrafts back in. Not everyone is having good luck with the Champions.
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  #7  
Old 04-23-2011, 12:07 PM
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Quote:
Originally Posted by glc View Post
You may want to pull the Champions out and put Motorcrafts back in. Not everyone is having good luck with the Champions.
X2.. I wouldnt use Champion plugs myself in my lawnmower.. I would still get it to give up the code. It will eventually. Try going up a hill slowly that might do it put a load on the engine..
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Old 04-23-2011, 04:16 PM
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thanks guy ill get the champions out, and pulled 28 foot boat with it yesterday and it still just said p0300

thanks yall
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  #9  
Old 04-23-2011, 04:44 PM
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Yes, remove those Champions lol.

Run ONLY - Motorcraft, Denso's or NGK's for that engine. NOT Autolites!
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  #10  
Old 04-24-2011, 12:37 PM
glc glc is offline
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No Denso or NGK for the 3v.
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  #11  
Old 04-24-2011, 03:23 PM
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Quote:
Originally Posted by glc View Post
No Denso or NGK for the 3v.
Crap! That's right, - I'm mistaken, that's for a 2 valve not the 3 valve. Thought the OP had a pre 04 model 2 valve for some reason.

The Champions can cause headaches in the 3V as well. There you better off with the Motorcrafts IMO.

Last edited by jbrew; 04-24-2011 at 03:25 PM.
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  #12  
Old 04-25-2011, 08:58 AM
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thanks guys im goin to get them out this weekend
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Old 04-25-2011, 08:58 AM


 
 
 
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