SILVERADO ROUGH IDLE.

  • Tiny
  • mcabee.duck
  • 2000 Chevrolet Silverado
  • V8
  • 2WD
  • automatic
  • 150,000 miles

2000 Chevy Silverado 1500 5.3L 2wd. Has a rough idle and "Service engine soon" light. AutoZone gave me the following codes: "P0131" and "P0300." I have changed the plugs and wires, what's going on?

Also, there is a squeak that sounds like a belt when I first start the truck and sometimes continues, and sometimes doesn't (may or may not be related).

Also, the heat in the truck is not as hot as it used to be (once again, may or may not be related).

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Monday, February 7th, 2011 AT 6:11 PM

8 Replies

  • Tiny
  • JDL
  • Expert
  • 16,289 posts

The p0131 is 02 sensor, bank one. I can't say the sensor is faulty. I'd have to start by checking the wiring circuit.

P0300 is a random misfire, how long since a tune-up. Check the note below'

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Monday, February 7th, 2011 AT 7:01 PM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

As far as the heat issue, does the engine reach normal operating temp? Are the heater hoses hot? If you live in an area that is extremely cold, you may need to use a block heater.

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Monday, February 7th, 2011 AT 7:04 PM
  • Tiny
  • mcabee.duck
  • Member

Thanks for the reply. Tune-up was done approx 1,000 miles ago. However, fuel filter has never been replaced. Would the o2 sensor code be caused by the random misfire (or vice versa)?

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Monday, February 7th, 2011 AT 7:19 PM
  • Tiny
  • JDL
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  • 16,289 posts

The random misfire may have caused the other code.

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Monday, February 7th, 2011 AT 7:23 PM
  • Tiny
  • mcabee.duck
  • Member

Ok, so what should I do to check the random misfire on random cylinders?

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Monday, February 7th, 2011 AT 7:26 PM
  • Tiny
  • mcabee.duck
  • Member

Also, I believe the heat issue is related to a low coolant level. Thanks

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Monday, February 7th, 2011 AT 7:52 PM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

Below is the flow chart for p0300.

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Monday, February 7th, 2011 AT 8:10 PM
  • Tiny
  • JDL
  • Expert
  • 16,289 posts

I did see a couple of tsbs for that code. The possibilities are just about endless. One tsb was for a problem computer ground, G103 I believe. You take the ground loose, check the wiring, use a file or something and shine-up the contact surfaces. G103 is located, right rear of engine block. The other tsb was for water getting into the fuel system, caused by the evap harness, vacuum lines.

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Monday, February 7th, 2011 AT 10:06 PM

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