RICE EATER Posted April 22, 2008 Report Share Posted April 22, 2008 well friday i went to leave work and started the truck up .. went back in side to grab something jumped in and took off and noticed a check eng light on.. so i went strait home.. being the weekend it was hard to get ahold of any one with a scanner.. but i did sunday and was driving over. and the light went off.... so we scanned it it was a PO300 random missfire code...everything seemed ok i drove it to work again and went to leave and it came back on again.. so i sstoped and got gas and went i went to leave it was gone?..anyone got anyideas why it would be so speratic?... also went i started it up in the morning it puffs alil black smoke then cleans up . i know when we put the cam in a few of the valves werent seatin all the way which i just figured was carbon and from siting for awhile .. do u think they might be causin the missfire code? Quote Link to comment Share on other sites More sharing options...
desrtrat Posted April 22, 2008 Report Share Posted April 22, 2008 maybe you have a injector(s) leaking a little and fouling your plugs just enough to throw a code when you first start it up. that also might explain the black smoke.. Quote Link to comment Share on other sites More sharing options...
shadowsniper3006 Posted April 22, 2008 Report Share Posted April 22, 2008 (edited) i get the 0300 all the time when i let me truck idle for more then 5 minutes. I was told it's the lopey idle that is tricking the motor into thinking there is a missfire. Edited April 22, 2008 by shadowsniper3006 (see edit history) Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted April 22, 2008 Report Share Posted April 22, 2008 could have been a bad tank of gas...I had the same issue with my GTP a few years back Quote Link to comment Share on other sites More sharing options...
Krambo Posted April 22, 2008 Report Share Posted April 22, 2008 i get the 0300 all the time when i let me truck idle for more then 5 minutes. I was told it's the lopey idle that is tricking the motor into thinking there is a missfire. I agree. you will want to adjust the misfire hit count up a tad in your tune. Quote Link to comment Share on other sites More sharing options...
RICE EATER Posted April 23, 2008 Author Report Share Posted April 23, 2008 thanks guys.. those ideas make sence i just filled up my tank so il hopefully that will rule that idea out and i just had it tuned a week or so before from zippy and he did tell him it will be alil rough on idle but the computer over time should smooth it out over time. so i guess il just keep an eye on it for alil while but from the sounds of it its not a big deal . i just probly bein alil over carefull sence i just got it runnin after popin the other motor.. and i guess im s.o.l and lookin more in to it till i get some money around to buy hp tuners. grr Quote Link to comment Share on other sites More sharing options...
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