PO300 code misfire/detected
#1
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Can someone please help me out here.My truck sets a PO300 code which is a randon misfire code.It runs great and idles smooth but I dont understand why it would be setting this code.Its makes no since to me guys.What would cause it to miss some?It obviously is not bad cause I can not even feel it and I can not even hear it at the tail pipes.
Can someone please help me out?Its driving me crazy.
Thanks guys
![Huh](https://www.performancetrucks.net/forums/images/smilies/LS1Tech/huh.gif)
Can someone please help me out?Its driving me crazy.
Thanks guys
#2
Formerly one92rs
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Originally Posted by vortec350
Can someone please help me out here.My truck sets a PO300 code which is a randon misfire code.It runs great and idles smooth but I dont understand why it would be setting this code.Its makes no since to me guys.What would cause it to miss some?It obviously is not bad cause I can not even feel it and I can not even hear it at the tail pipes.
Can someone please help me out?Its driving me crazy.
Thanks guys
![Huh](https://www.performancetrucks.net/forums/images/smilies/LS1Tech/huh.gif)
Can someone please help me out?Its driving me crazy.
Thanks guys
#3
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Talk to Allen at Nelson Performance, I have had the same code due to modifications, not realy a misfire but Allen can explain it and correct it. allen@ls1truck.com
#4
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Originally Posted by vortec350
Can someone please help me out here.My truck sets a PO300 code which is a randon misfire code.It runs great and idles smooth but I dont understand why it would be setting this code.Its makes no since to me guys.What would cause it to miss some?It obviously is not bad cause I can not even feel it and I can not even hear it at the tail pipes.
Can someone please help me out?Its driving me crazy.
Thanks guys
![Huh](https://www.performancetrucks.net/forums/images/smilies/LS1Tech/huh.gif)
Can someone please help me out?Its driving me crazy.
Thanks guys
If you have access to a Tech2 or other tool you can pulse the injectors one at time. When I did this, the #1 injector would not "click" because the poppet valve was clogged.
#5
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Originally Posted by vortec350
Can someone please help me out here.My truck sets a PO300 code which is a randon misfire code.It runs great and idles smooth but I dont understand why it would be setting this code.Its makes no since to me guys.What would cause it to miss some?It obviously is not bad cause I can not even feel it and I can not even hear it at the tail pipes.
Can someone please help me out?Its driving me crazy.
Thanks guys
![Huh](https://www.performancetrucks.net/forums/images/smilies/LS1Tech/huh.gif)
Can someone please help me out?Its driving me crazy.
Thanks guys
#6
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Is that the only code you get?
I had that code along with 'bad egr', 'bad passenger front 02 sensor' and what I did was:
-top engine cleaner
-new front passenger o2 sensor
-cleaned egr
Now I just get the egr code SES lite once in a while so I am going to do a new EGR.
How does the Techron stuff work, I'd like to clean my injectors I have 126K on my 99 L31.
I had that code along with 'bad egr', 'bad passenger front 02 sensor' and what I did was:
-top engine cleaner
-new front passenger o2 sensor
-cleaned egr
Now I just get the egr code SES lite once in a while so I am going to do a new EGR.
How does the Techron stuff work, I'd like to clean my injectors I have 126K on my 99 L31.
#7
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Originally Posted by Pro Stock John
Is that the only code you get?
I had that code along with 'bad egr', 'bad passenger front 02 sensor' and what I did was:
-top engine cleaner
-new front passenger o2 sensor
-cleaned egr
Now I just get the egr code SES lite once in a while so I am going to do a new EGR.
How does the Techron stuff work, I'd like to clean my injectors I have 126K on my 99 L31.
I had that code along with 'bad egr', 'bad passenger front 02 sensor' and what I did was:
-top engine cleaner
-new front passenger o2 sensor
-cleaned egr
Now I just get the egr code SES lite once in a while so I am going to do a new EGR.
How does the Techron stuff work, I'd like to clean my injectors I have 126K on my 99 L31.
A couple bottles of Techron always cleared up my injectors and poppet valves for a few thousand miles. I would say it was second behind the top engine cleaner.
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