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Thread: Code P0303 What Could It Be??
01-21-2014, 01:37 AM #1
- Join Date
- Jan 2014
Code P0303 What Could It Be??
- Hi, I'm new to the forum and don't know a whole lot but am trying to figure my problem out. I have a 96 Chevy Express 1500 with a 5.7 350 in it and it is running really sluggish and is having misfire code(p303-misfire)service engine soon light is on. It started doing it when I was heading up a hill, it just started bogging and has been doing it ever since especially when I give it a lot of gas. I thought was a lifters problem plus rods (i replaced all that) and was no luck problem is still there ,haven't replaced the plugs and wires as well as cap/rotor . I have been researching the common fuel intake problems with the motor and am starting to think I need to clean the injectors (spider replacing ). It has 160000 miles on it . Does anyone have any good suggestions to try anything. Any ideas to what it could be. It seems to idle right and drives ok at the beginning , but when i want the overdrive the hole maracas comes out to play.
01-21-2014, 08:09 AM #2****THREAD MOVED****
GENERAL CHEVY/GM TECH QUESTION SECTION
5.3 l 3.73 l G80
BLACK BEAR CUSTOM TUNE
SNUGTOP l COLORMATCH l KATZKIN
01-23-2014, 07:27 PM #3
I would suspect a fuel delivery problem also. Under no or low load runs fine but give it gas and it falls on it's face? Check the fuel pressure and change the filter for a start. I don't have the pressure specs for the 96.2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
01-24-2014, 04:55 PM #4
P0303 is a mis-fire on cylinder #3.
It could be many things, I would check the common ones and the simpler ones first. The most common problem is "no spark". This could be a bad plug, a bad wire, a bad dist cap.
Number 3 is the cylinder that is 2nd from the front on the driver's side.
'09 Avalanche LTZ - Black
'05 Envoy XL (sold)
01-26-2014, 06:10 PM #5
- Join Date
- Jan 2014
it sounds like was a lifter stuck, but was not i still have the knock, now im looking to change all the , (plugs/cables/rotor-n-cap and ignition ) will be crossing my fingers.
Thanks for your imput
i should have wrote code,,,,P0300,,,,MULTIPLES MISFIRES,,Sfor the mistype
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