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High idle

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi:
The reason I asked was because it would have narrowed it down for us. Without a code, anything electrical / sensor related would be a guess. Check to see if you hear any vacuum leaks under the hood. That could cause a high idle.
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HOTROD0910
  • MEMBER
  • 4 POSTS
  • 2000 CHEVROLET IMPALA
  • 3.4L
  • V6
  • FWD
  • AUTOMATIC
  • 147,491 MILES
I have a 2000 Chevy impala that revs up and high I have replaced the pcv valve throttle postiotn sensor and replaced the idle air control sensor. It still runs high and when I kill it it dies rough. What else could be the problem no vaccum leak anywhere does anyone know what I can do
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and clean throttle plate on both sides and iac with choke cleaner.
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HOTROD0910
  • MEMBER
  • 4 POSTS
I have changed throttle position sensor, idle air sensor, pvv valve and checked all vacuum lines. New throttle body and clean again. Still idles high mechanic said no codes must do a idle relearn? But googled it and tryed it must not be right one BC it did not work. Could it be mass air flow sensor IR EGR VALVE? OR FUEL pressure regulator?
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes and check fuel pressure with a gauge.48-55 psi key on only
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HOTROD0910
  • MEMBER
  • 4 POSTS
I do not have a fuel pressure gauge or know how to check it.
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Auto parts rent it, there is a connection on fuel rail to hook it up if not have apro do it as it will need an adapter.
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HOTROD0910
  • MEMBER
  • 4 POSTS
OK will try that. Thank u. But if its good what's my next step? From what I have read all impala have this problem and its getting old trying figure it out
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+1
Tuesday, October 29th, 2019 AT 6:32 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have a local pro check it.
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Tuesday, October 29th, 2019 AT 6:32 PM (Merged)

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