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Old 03-25-2015, 11:41 AM   #1
steven2680
 
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p300 code random misfire

What's up guy I have a problem with this code p300 I know that is a camaro forum but I have a 2003 chevy tahoe . The code p300 came up I chang spark plug, wires ,I change the plugs back in dec, I don't know what can it be i appreciate any help thanks
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Old 03-25-2015, 11:58 AM   #2
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Intake gasket, or vacuum leak after the MAF sensor would be where I would look first. P0300 indicates that the misfire is random, and not isolated to a particular cylinder. A bad plug, plug wire, or coil pack would be the same cylinder every time. For example A P0301 code would indicate a misfire on cylinder one.
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Old 03-25-2015, 12:11 PM   #3
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Cool I just pick up the maf airflow my truck have 118,000 mile the wires was change last night thinking it was the problem but it wasn't the plug was change on December but I just pulled them out from the passenger side and they look White i did the driver side also and are brownish
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Old 03-25-2015, 12:29 PM   #4
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Sounds like the passenger bank is running lean.
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Old 03-25-2015, 12:41 PM   #5
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I change the maf air flow and still doing the same thing ing
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Old 03-25-2015, 03:06 PM   #6
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He said a vacuum leak past the MAF, not the MAF itself. You probably need to replace the intake gaskets if the whole bank is lean.
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Old 03-25-2015, 03:18 PM   #7
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I check all vacuum lines and I haven't seen no leaks. I replace the intake manifold gasket about 5 years agocould the intake manifold gasket be broken already
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Old 03-25-2015, 04:32 PM   #8
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If the leak were from a line, the problem would likely be seen on all cylinders. Since you say the plugs on one bank are white, the like culprit is the intake gasket on that side. You could try spraying starter fluid around the that side of the intake and see if the idle changes. If it does, three is a vacuum leak.
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Old 03-25-2015, 05:03 PM   #9
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I already Spray carburetor cleaner around that area and I haven't seen nothing change
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Old 03-25-2015, 11:39 PM   #10
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I have a similar problem on my truck but only cyl 1 n 6
Just replaced gaskets despite no change when spraying starting fluid
Running a scan on Fri
I'll let u know how it goes
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Old 03-26-2015, 06:38 AM   #11
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Ok think bro since the truck have 118,000 mile I havent done nothing to it but a water pump woo I just order some parts and see which 1 is the part that making the truck misfire I will give a update when I find the problem
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Old 03-27-2015, 04:33 PM   #12
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I put the gaskets on and I can no longer hear the brief whistle from inside the cab when I blip the throttle, but I still get some misfires on 1 & 6, but no longer enough to throw a code.
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Old 03-27-2015, 07:09 PM   #13
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I did sea foam about 2 bottles it got a Lil better but now I have a misfire on cyl 7
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Old 03-30-2015, 12:42 PM   #14
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There was oil on the intake runners. I think I will give that a shot.
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