LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

cold start high idle

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Old Oct 28, 2007 | 11:31 PM
  #1  
Daniel6718's Avatar
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From: Garland, tx
cold start high idle

cant figure it out...i can drive 5 minutes and it will still ilde at 1500-1800 at lights...but 5 seconds after i start it if i let the clutch out and bog down the motor 3 or 4 times it will idle down to 100 and stay there just fine...

i removed the t/b and cleaned well...check for vac leaks...but its perfectly fine after it idles down, like it has trouble searching for idle...but it doesnt change just stays at 1500-1800...if i let it sit and idle it will take about 45 seconds and it will idle down to 1000

my friends cars the same just an auto and he starts his and it idles great even on cold starts

might be related but when i park my car after driving it kinda smells like gas as i get out, but not when sittin there...think the charcoal canister might be full...can you dry it out or clean it out or do you have to purchase a new one?
Old Nov 2, 2007 | 04:51 AM
  #2  
Guest47904's Avatar
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Sounds like you're running too rich. Gona have to scan it to see what the O2s are reading and what the fuel trims are. At least look for a ruptured FPR or a leaky injector.
Old Nov 2, 2007 | 07:32 PM
  #3  
OBE1 95Z28's Avatar
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Dab a little oil on the throttle body butterfly rod, where it enters the housing. My rpms stuck after cleaning the TB. Oiled it and the problem went away.
Old Nov 2, 2007 | 08:23 PM
  #4  
Daniel6718's Avatar
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From: Garland, tx
fpr is good and no leaky injectors...on ls1tech they though i had a vacume leak checked it to be 18-20 at idle...

its funny you can watch it learn its idle...from 1500 to 1200 to 1100 to 1000 ans its smoothe all the way until it idles about 950-1000 when it does it starts a random not miss but stumble
Old Nov 3, 2007 | 04:22 PM
  #5  
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From: Central NJ
I know my car had a high idle for a while and couldnt figure it out. I found out that the cruise control cable was just tight enough to keep my idle up around 1800rpm. Disconnected the cable and no more high idle
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