2004 CHEVY SILVERADO WONT IDLE

  • Tiny
  • asupinger1
  • 2004 Chevrolet Silverado

Engine Performance problem
2004 Chevy Silverado V8 Four Wheel Drive Automatic 100460 miles

I was getting on the hiway and noticed a slight loss of power and acceleration unless I floored it then it was fine. When I stopped at the off ramp light it would not idle on its own. I can push the gas and it feels smooth over 2000 rpms. So ichanged the maf sensor, spark plugs, wires and even the catalytic converters. Still runs rough at low rpm and wont idle at all. But will start right back up. Can you help me. My check engine light is on and get codes P0300 and P0101. A garage checked it and said it was that cats. But it wasnt.

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Monday, April 7th, 2008 AT 7:53 PM

5 Replies

  • Tiny
  • dennyp
  • Expert
  • 1,873 posts

The first step would be cleaning the throttle body out. If you have carbon buildup in the throttle body, it will cause poor or no idle quality. If this doesn't help, try to determine which cylinders show misfires. Let me know what you find.

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Monday, April 7th, 2008 AT 9:04 PM
  • Tiny
  • asupinger1
  • Member

I checked the engine compression and one cylinder had no compression at all so I removed the valve cover and that cylinder has a broken valve spring. The throttle body was fine.

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Sunday, April 13th, 2008 AT 3:51 PM
  • Tiny
  • dennyp
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Was it the driver side rear cylinder? I have seen about 5 different silverados with broken valve springs in the same location. 4 of them just got valve springs, 1 of them had to get a cylinder head.

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Sunday, April 13th, 2008 AT 10:53 PM
  • Tiny
  • asupinger1
  • Member

It was the second cylinder from the front on the drivers side. And the rear spring on that cylinder. If you had heard of that before then a clue might of saved me alot of time and money.

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Friday, April 18th, 2008 AT 8:49 PM
  • Tiny
  • dennyp
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I wish you would have posted the symptoms before you had all of those parts changed. It could have saved some time and money.

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Sunday, April 20th, 2008 AT 6:59 AM

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