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High idle when coming to a stop

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Old Jan 23, 2012 | 03:20 PM
  #1  
80schild's Avatar
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From: Alabama
Car: 87 GTA
Engine: 5.7 TPI
Transmission: 700r4
Axle/Gears: 3:27 BW 9 bolt
High idle when coming to a stop

Okay i got my injectors replaced and overall the car runs good now, but I notice when I come to a stop the idle seems high, and then after I'm stopped for maybe 4 or 5 seconds the rpms will drop down to normal. Also if I stop and put it in park it will jump up to 1k rpm for about 5 seconds, then drop to 500 or so.

I feel like this is putting unnecessary wear on my brakes. Or maybe it's normal?
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Old Jan 23, 2012 | 03:24 PM
  #2  
luvofjah's Avatar
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From: PNW
Car: 91 Black Formula KR
Engine: 305 TPI R69/G92
Transmission: Astro A5-Pro 5.0-McCleod
Axle/Gears: US Gear 3.42 Eaton True Trac
Re: High idle when coming to a stop

IAC valve or if you disconnected the Throttle position Sensor when putting in new injectors, maybe needs to be re-calibrated....

Raf
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Old Jan 23, 2012 | 03:26 PM
  #3  
skibum2100's Avatar
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Joined: May 2010
Posts: 259
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From: Boulder Colorado
Car: 1988 GTA
Engine: 5.7 TPI w/ Bosch III's
Transmission: T56
Axle/Gears: 3.27 Borg Warner 9 bolt
Re: High idle when coming to a stop

The ecm keeps the rpm's up when coming to a stop, that is normal.

The jump by 1k when in gear seems excessive.
Did you ever get a chance to reset the minimum idle? (Now that you have the proper amount of fuel, it would be a good idea.)

Cheers
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Old Jan 23, 2012 | 04:17 PM
  #4  
80schild's Avatar
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15 Year Member
iTrader: (5)
 
Joined: May 2008
Posts: 1,361
Likes: 52
From: Alabama
Car: 87 GTA
Engine: 5.7 TPI
Transmission: 700r4
Axle/Gears: 3:27 BW 9 bolt
Re: High idle when coming to a stop

No, I never reset the idle.

The idle does eventually drop down to where it's supposed to be, it just takes a few seconds longer than other vehicles I have owned.
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