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High idle

Tiny
EDDIESUEANN
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
High idle at startup no codes stays high, when I push on throttle engine revs up and down I have replaced tps and iac no change
Tuesday, April 5th, 2016 AT 12:39 PM

12 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you checked for vacuum leaks?
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Thursday, April 7th, 2016 AT 7:52 PM
Tiny
EDDIESUEANN
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  • 6 POSTS
Yes I Have can't find any
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Sunday, April 10th, 2016 AT 4:50 PM
Tiny
SATURNTECH9
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How did you check for them?Also have you checked the coolant temp sensor?
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Sunday, April 10th, 2016 AT 4:52 PM
Tiny
EDDIESUEANN
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  • 6 POSTS
I checked them visually and with starting fluid sprayed all around with engine running no change
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Sunday, April 10th, 2016 AT 10:26 PM
Tiny
SATURNTECH9
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The best way to check for vacuum leaks is by injecting smoke and watching for escaping smoke. Also the best way to spray around with carb spray method is to watch short term fuel trim and watching to spike while spraying around. Also did you check the coolant temp sensor?They can go bad not set a code and cause a high idle.
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Sunday, April 10th, 2016 AT 10:31 PM
Tiny
EDDIESUEANN
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  • 6 POSTS
I did check the coolant temp sensor it's ok also injected smoke the only place it came out was the egr so I replaced that still the same?
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Friday, April 15th, 2016 AT 3:43 PM
Tiny
SATURNTECH9
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So did you watch the coolant temp on live engine data while comparing the coolant temp to actual coolant temp?
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Friday, April 15th, 2016 AT 6:10 PM
Tiny
SATURNTECH9
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Also what are your tps readings in volts at idle?
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Friday, April 15th, 2016 AT 6:28 PM
Tiny
EDDIESUEANN
  • MEMBER
  • 6 POSTS
Ok here it is I couldn't find any problems untill I tested the coolant temp sensor and it showed low voltage so I went to the PCM it was loose and had worn 4 wires rubbed into I don't know how it still ran even with high idle anyway I fixed the wires now it runs fine who would know?
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Monday, April 18th, 2016 AT 7:58 PM
Tiny
SATURNTECH9
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Thru years of experience with coolant temp sensor issues I have seen really strange things you wouldn't think they could cause but your proven wrong lol. Glad to hear you found the problem and got it all back to normal again.
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Monday, April 18th, 2016 AT 8:04 PM
Tiny
EDDIESUEANN
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I went all the way to the temp sensor which led me to the real problem Thanks again
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Monday, April 18th, 2016 AT 11:17 PM
Tiny
SATURNTECH9
  • MECHANIC
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Your welcome were hear to help.
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Monday, April 18th, 2016 AT 11:19 PM

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