C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

engine idle

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Old Dec 19, 2003 | 06:40 PM
  #1  
86 silver bullit's Avatar
86 silver bullit
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Joined: Nov 2003
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From: brampton
Default engine idle

the engine runs at a steady 700 rpm...but it seems to sound like it is searching for an idle...it goes up and down..not to bad. It is only slightly noticable...Any ideas.. :chevy
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Old Dec 19, 2003 | 06:50 PM
  #2  
65Z01's Avatar
65Z01
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From: SE NY
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Default Re: engine idle (86 silver bullit)

Most often a searching idle indicates that the TB is dirty or the IAC is dirty or faulty.
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Old Dec 19, 2003 | 07:02 PM
  #3  
corvette90's Avatar
corvette90
Burning Brakes
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Joined: Nov 2000
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From: Austria
Default Re: engine idle (65Z01)

mine is searching a little for idle, too but IAC is working-you can hear the hissing noise when A/C turns on..and TB is clean, was disassembled..

waht else could it be
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Old Dec 19, 2003 | 07:05 PM
  #4  
Goody's Avatar
Goody
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From: Oak Harbor WA
Default Re: engine idle (corvette90)

you can hear the hissing noise
Vacuum leak maybe. :confused:
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Old Dec 20, 2003 | 08:11 AM
  #5  
corvette90's Avatar
corvette90
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From: Austria
Default Re: engine idle (Goody)

hi..

definitely no vacuum leak, since engine was disassembled , and i meant, wiht the air inatke duct removed, you can hear when IAC turns on, just a moment before A/C clutch engages..thats normal...
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Old Dec 20, 2003 | 08:19 AM
  #6  
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NoWorries
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Joined: Oct 2000
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Default Re: engine idle (86 silver bullit)

Mine did that when the EGR Valve when bad. I removed it and capped it, and all was well, got better gas mileage too.



:cheers:
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Old Dec 20, 2003 | 04:20 PM
  #7  
86 silver bullit's Avatar
86 silver bullit
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From: brampton
Default Re: engine idle (NoWorries)

I installed a new egr valve right from g.m when I did the motor...It seems to disappear when I remove the hig flow throttle body air foil...I am still swaying towards a distributor rebuild as it has new wires, plugs...and everything was cleaned when we redid the motor. :chevy
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