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2000 Chevy Silverado 5

Tiny
DEALSBESTS
  • MEMBER
  • 2000 CHEVROLET SILVERADO
  • 122,000 MILES
2000 Chevy silverado 5.3l v8 with 122000mi.
Check engine light is on and shows codes of too lean left and right bank and p0300 engine misfire. Rpms go up and down at startup and almost dies but runs fine when driven around or after it warms up. Rpms are rougher with cold weather.
What is causing this? Also, loss of power.
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Wednesday, January 9th, 2013 AT 4:27 PM

3 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Use a gage and check fuel pressure. How long since a tune-up? 02 sensors are part of a tune-up. Clean idle air system.
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Wednesday, January 9th, 2013 AT 5:02 PM
Tiny
DEALSBESTS
  • MEMBER
  • 6 POSTS
I have cleaned idle air valve. And I replaced it with a new one at one point in time and the idle kept climbing so I put the old one back in. Still haven't checked fuel pressure yet but will soon. I didn't know o2 was apart of a tune up, thanks.
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Thursday, January 10th, 2013 AT 11:59 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Have you changed plugs and plug wires recently? The p0300 could be almost anything. The p0300 is cylinder misfire, but, the exact cylinder can't be determined.
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Friday, January 11th, 2013 AT 6:57 PM

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