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Car Forum / Pontiac / Pontiac Cars / January 2006

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IAC o-ring

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Silver Surfer - 28 Jan 2006 01:25 GMT
Took the IAC unit out of the throttle body on my '92 Grand Am's Quad Four
today.  Wanted to clean it up in hopes of clearing a code 35.

The service manual very clearly shows that the IAC has an o-ring for
sealing.  By golly I can find neither hide nor hair of that darn thing.
Don't think it fell off when I pulled the unit out.  Have looked around on
the floor and under the hood.  Don't see anything, but that doesn't mean it
isn't there.  The IAC has not been removed in the past to the best of my
knowledge.  Surely it does require an o-ring does it not?  If so would you
know what size it is?  Can't find a listing for the o-ring on the Advance,
AutoZone, or NAPA sites.
=AB Paul =BB - 28 Jan 2006 01:47 GMT
> Took the IAC unit out of the throttle body on my '92 Grand Am's Quad Four
> today.  Wanted to clean it up in hopes of clearing a code 35.
[quoted text clipped - 7 lines]
> know what size it is?  Can't find a listing for the o-ring on the Advance,
> AutoZone, or NAPA sites.

I just put a new IAC motor in my 3.3.  Mine uses an o-ring.
I don't have the old one but I can tell you that the OD of the
metal iac part is exactly 7/8 inch dia because I have the old motor.
The o-ring was the thin kind, not the thick one.  It may leak without it.
Silver Surfer - 28 Jan 2006 03:00 GMT
OK.  Thanks.  I'll double check the OD of my IAC.

I'm not an o-ring expert.  I wonder how many different thicknesses they come
in for a given ID?  Might have to purchase a selection and proceed by trial
and error.  Knowing that your o-ring was not a fat one is helpful.

Guess I could make the trek to the dealer and buy one there, but time is of
the essence.

"« Paul »" <"=?x-user-defined?Q?=AB?= Paul
=?x-user-defined?Q?=BB?="@houston.rr.com> wrote in message
news:43DACD6D.EDEC4AFD@houston.rr.com...

>> Took the IAC unit out of the throttle body on my '92 Grand Am's Quad Four
>> today.  Wanted to clean it up in hopes of clearing a code 35.
[quoted text clipped - 16 lines]
> metal iac part is exactly 7/8 inch dia because I have the old motor.
> The o-ring was the thin kind, not the thick one.  It may leak without it.
=AB Paul =BB - 28 Jan 2006 03:28 GMT
> OK.  Thanks.  I'll double check the OD of my IAC.
>
[quoted text clipped - 4 lines]
> Guess I could make the trek to the dealer and buy one there, but time is of
> the essence.

The old one was black neoprene.  The Ace Hardware down the road from
me has way over 200 neoprene o-rings of different diameters.
However, there seems to be only a thick one and a thin one.
Silver Surfer - 28 Jan 2006 04:55 GMT
I checked on the Parker Web site and they list several standard 3/4" o-rings
starting at 1/16" thick and progressing in 1/32" increments.  Ace Hardware
might be a good bet, although I've since discovered that Advance sells an
assortment.  My local NAPA has one very badly depleted assortment of
individual rings they keep on the back shelf.

"« Paul »" <"=?x-user-defined?Q?=AB?= Paul
=?x-user-defined?Q?=BB?="@houston.rr.com> wrote in message
news:43DAE537.3875E5B0@houston.rr.com...

>> OK.  Thanks.  I'll double check the OD of my IAC.
>>
[quoted text clipped - 11 lines]
> me has way over 200 neoprene o-rings of different diameters.
> However, there seems to be only a thick one and a thin one.
Silver Surfer - 29 Jan 2006 00:29 GMT
Found the right o-ring at a home improvement store in town.  Ace was closed
for the evening.  You were exactly right.  It took a 3/4" ID, 1/16" thick
o-ring to do the job.  Nothing else I had on hand would let the IAC seat.
Thanks for your help on this.

Stupid Advance store.  What a worthless o-ring selection there.  Same at
AutoZone.

>I checked on the Parker Web site and they list several standard 3/4"
>o-rings starting at 1/16" thick and progressing in 1/32" increments.  Ace
[quoted text clipped - 21 lines]
>> me has way over 200 neoprene o-rings of different diameters.
>> However, there seems to be only a thick one and a thin one.
 
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