ENGINE STARTS AND THEN CONTINUES REVING

  • Tiny
  • pegasuskat1
  • 2005 Chevrolet Venture
  • 15,000 miles

Engine starts and then continues reving. Mass air flow sensor was replaced; oxygen sensor was replaced. Engine runs with no problem except for the reving. We are at wits end! Please help. Thanks!

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Monday, March 18th, 2013 AT 2:06 AM

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  • Tiny
  • saturntech9
  • Expert
  • 29,444 posts

Have you looked for a vacuum leak yet?Also have you checked for codes?

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Monday, March 18th, 2013 AT 2:56 AM
  • Tiny
  • pegasuskat1
  • Member

Thanks for your response. I towed it to Pepboys and they told me that I have a cracked air box. I was told that it needs to be replaced. I was told by another mechanic that I do not have to replace the air box. I was in a car accident and that side was pushed in and they say that it is close to impossible to replace with a new box. Also they told me that the spark plugs were fouled (whatever that means) and that they should be replaced along with the plug wires. How does one look for a vacuum leak?

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Thursday, March 21st, 2013 AT 1:08 AM
  • Tiny
  • saturntech9
  • Expert
  • 29,444 posts

The best way to look for a leak is with smoke you can build a smoke machine or use a cigar. You can use a plastic bag around the throttle and use the intake tube to hold the plastic bag in place. Then put the smoke in the vacuum line going to the brake booster and watch for smoke escaping?

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Thursday, March 21st, 2013 AT 2:24 AM

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