3400 / no fast idle when cold [Archive] - GrandAmGT.com Forum

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bigbangtech
12-24-2004, 06:46 PM
I have a 99 GA with 3400 that I just acquired from a friend. When warmed up, engine is smooth. There are no codes or lights, but from my experience with other engines, it should idle fast when cold. It's only getting up to about 800RPM when cold at 30 degrees farenheit. Is this normal, or is something possibly wrong with the IAC valve, or something else.

Thanks

jake3217
12-24-2004, 08:05 PM
Sounds like it already is idling fast. Though I don't own a 3400 (I have an Ecotec), I would guess the normal idle to be around 600 RPM. 800 RPM at 30 degrees sounds normal to me, when I started up this morning it was around 1000 RPM at around 0 degrees.

Malaclypse
12-24-2004, 08:41 PM
That's normal. The low temps won't cause the car to idle any different except immedeatly after its started after sitting awhile.

5-lO
12-24-2004, 09:23 PM
I have a 99 GA with 3400 that I just acquired from a friend. When warmed up, engine is smooth. There are no codes or lights, but from my experience with other engines, it should idle fast when cold. It's only getting up to about 800RPM when cold at 30 degrees farenheit. Is this normal, or is something possibly wrong with the IAC valve, or something else.

Thanks

I believe that you are thinking of a cold engine. Upon start up, my car usually idles about 1500 untill it warms up, and then yes, no matter the temperature it will idle at 800 or so RPM.

The person who said their car idles at 600, that is not good and to the best of my knowledge could cause the car to stall out. You may want to get that checked.

bigbangtech
12-24-2004, 10:33 PM
That's normal. The low temps won't cause the car to idle any different except immedeatly after its started after sitting awhile.


I meant to say that when the engine is cold, not used for a day and it's really cold outside, upon starting, the engine does not go above 800 in the first few seconds like it's supposed to.

I think that trying to warm an engine at 800 when it's stone cold isn't the most efficient way to get lubrication going.

As other people have observed, their engines go up to 1500 or so for 30 seconds and then idle down to about 1100 amd then get lower to ABOUT 800 when it's fully warm.

Mine just sits at 800 from the second it starts and idles pretty rough(understandable because it hasn't gone through a fast idle yet) until it has been running for about 5-10 minutes, after which it runs perfect.

Any ideas why it won't fast idle?

Hodge
12-24-2004, 10:48 PM
my 2.4 idles at just below 1 grand and then normal is 600 so that sounsd about right

bigbangtech
12-24-2004, 10:50 PM
my 2.4 idles at just below 1 grand and then normal is 600 so that sounsd about right

I mentioned that my 3400 won't fast idle at all...

videoman
12-24-2004, 11:27 PM
I live in a cold climate and yes, 800rpm is normal for a temp of about 0'C ( 32'F ).
When the engine is colder than that the normal idle can be as high as about 1300 RPM. This ensures that the engine is kept at a steady pace while the block is cold. If it went slower it doesn't produce as much heat to warm the engine up and it is possible that engine would stall as well.

Once the operating temperature reaches about 40'C+ the engines idles slows.

DevilSlayer
12-24-2004, 11:44 PM
I have a 99 GA GT with a 3400 and mine only idles at 900rpm in the morning (between 15-30*F overnight). 800 doesn't seem out of the ordinary. When it warms up it idles at 650rpm.

bigbangtech
12-25-2004, 11:02 AM
Any ideas about no fast idling happening EVER?

coupe
12-25-2004, 11:26 AM
Your the first ive ever heard of
My 3400 idles at about 1300-1500 rpm when cold and about 800 rpm when warmed up.