who here had the p0300 random misfire code?

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May 21, 2005 | 02:06 PM

#11

VTODD

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From: Decatur, IL

Quote:

Originally Posted by goshawk23

ok, i do have extra wires(stock) and i do have extra plugs (tr55s). i went and checked the plug wires to see if they were all on tight and they were. so now i'll check the plugs. only problem is i have drill this weekend so no mech work can happen till monday. engine pulls just fine tho.

i do have a semi new tune. installed it last week. my ses light stays on cause of no cats and the tuner can't get the light to stay off. only new mods are headers and nitrous. i have only sprayed 6lbs of gas through the motor but all the variables seem fine as in fuel/nitrous mixture, and crap like that.

iam betting that it is your tune. it took me about a week on my new tune for that code to appear.

May 21, 2005 | 06:33 PM

#12

goshawk23

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From: Ocean Springs, MS

Quote:

Originally Posted by vtodd82

iam betting that it is your tune. it took me about a week on my new tune for that code to appear.

i am hearing from other folks that it is 90 percent the tune that did it. of course the headers is what helped bring it on. so i have a few other tunes sitting here to try out to see if it goes away then if that don't work, another new tune to correct for it.

May 23, 2005 | 04:12 PM

#13

goshawk23

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From: Ocean Springs, MS

ok, the winners are the people that said cracked plug. i took 6 out last night before it got dark on me. then today i pulled plugs 7 and 8. number 8 was cracked. thanks for the help fellas.

May 23, 2005 | 05:06 PM

#14

BigTex

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From: East of Dallas

I had the same problem after my first header install. It ran and idled OK mostly, but I would get a blinking SES and P0300 misfire some too. Turned out I bumped a plug putting the pass side header in.

May 23, 2005 | 06:08 PM

#15

goshawk23

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From: Ocean Springs, MS

i still don't think it is idling right. seems a bit rough even after puting in a good plug. then again, it could be the fact it has 7 tr6's and 1 tr55 in it. but the idle did come up from 500 or so.