Thread: p0300 code
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Old 02-03-2018, 06:34 PM   #1
kent ross
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Join Date: Sep 2007
Location: Rowlett, Texas
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p0300 code

This one is driving me crazy.
I only get the code when the car idles. I can drive for a week to work and back all highway 43 miles each way.
I replaced the intake madifold gasket, MAP sensor, Just replaced all spark plugs, Plug wires and coils. Still getting the same code.
Here is my Freeze Frame data:
DTCFRZF=P0300
Fuelsys1=OL
Fuelsys2=OL?
Load_pct%=3.9
ect=170
shrtft1=-7.8
longft1=3.1
shrtft2=-9.4
longft2=4.7?
map=41.0
rpm=722
vss=0
maf=9.89
tp=11.0
All of the plugs looked the same
When this first started i did receive one MAF sensor error so I cleaned the Sensor with some MAF cleaner. I do not have any other error codes.
this is a GMC 2003 YukonXL 5.3 non flex with 145,000 miles.
Any help would be nice
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