V6 Discussion and questions about the base carbureted or MPFI V6's and the rare SFI Turbo V6.

where is the iac valve??

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Old Mar 18, 2005 | 02:29 PM
  #1  
91blue_fire's Avatar
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From: nj
Car: 1985 iroc-z
Engine: 305 tpi with hooker super comp exhaust
Transmission: stock 700r4
where is the iac valve??

my car surges when i stop and when it gets almost to opperating temp it also idles funny...i had a starter replaced lately at a shop and i think they didnt connect one of the vacumme lines tight. where would these lines be? and im thinking after ready the iac forum im thinkin it could also be a problem..oh..and my pvc valve is LOOSE...not tightly on my valve cover like it should be..is it gone or does it need some gasket glue or something...thanks
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Old Mar 18, 2005 | 03:24 PM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Ahh, replace starter, need to disconnect battery first. The 3.1's need to have an idle learn session completed after a battery disconnect. Otherwise the symptoms you are having rear their ugly head.

I've posted the steps here before, if I I can find them I'll post back.

RBob.
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Old Mar 18, 2005 | 03:36 PM
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From: Long Island, NY
Sounds like a EGR problem or O2 sensor...
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Old Mar 18, 2005 | 03:42 PM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Here you go:

https://www.thirdgen.org/techbb2/sho...idle+AND+learn

My original post is gone but Dale outlined it in that post. There is also some other good information on cleaning the TB.

To answer one of your other questions the IAC is on the right side of the TB. Black plastic (?) can, 4 wire connector and two screws holding it on.

RBob.
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Old Mar 18, 2005 | 03:44 PM
  #5  
bru333's Avatar
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From: Smithfield, NC
Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
Re: where is the iac valve??

Originally posted by 91blue_fire
..and my pvc valve is LOOSE...not tightly on my valve cover like it should be..is it gone or does it need some gasket glue or something...thanks
The rubber gasket the pcv valve is mounted in is prolly worn out. You need to get the pcv valve to be tight in the valve cover, it's just a vacuum leak if it isn't sealing well.
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Old Mar 18, 2005 | 04:31 PM
  #6  
91blue_fire's Avatar
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From: nj
Car: 1985 iroc-z
Engine: 305 tpi with hooker super comp exhaust
Transmission: stock 700r4
thanx i really appriciate it. my pvc valve is basically just sitting there, lol..that prolly explains why i smell gas all the time. so if i follow the steps u gave me it should stop with the wierd hesitating and sputtering? its only been since that starter has been replaced. it was wierder when i 1st got it back. thanx again!!
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Old Mar 18, 2005 | 08:06 PM
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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Yes, the idle learn works. Otherwise it takes about two weeks of daily driving with stop and go traffic for it to straighten itself out.

RBob.
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Old Mar 18, 2005 | 08:20 PM
  #8  
Doward's Avatar
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From: Gainesville, FL
Car: 1988 Chevy Camaro Hardtop
Engine: Turbocharged/Intercooled 3.1
Transmission: World Class T5 5 Speed
Re: Re: where is the iac valve??

Originally posted by bru333
The rubber gasket the pcv valve is mounted in is prolly worn out. You need to get the pcv valve to be tight in the valve cover, it's just a vacuum leak if it isn't sealing well.
Anyone have a part number?
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Old Mar 18, 2005 | 09:11 PM
  #9  
bru333's Avatar
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From: Smithfield, NC
Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
This is the PCV grommet I used for my '87 2.8l.
Motormite #42062.
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