High idle on cold starts on cold days

[texadelphia]

My 3.4L with 5-speed has recently developed a really high idle on cold starts on cold days (<65). When I start it it immediately goes up to about 1800 rpm and slowly climbs to about 2100 rpm. After I drive it for a couple minutes it drops down to a more normal idle. On warm morning (65+) it idles fine on start up. I'm guessing this is related to the IAC but I was wondering if anyone has experienced this and found a different solution.

 

[spartacus]

My 3.4L with 5-speed has recently developed a really high idle on cold starts on cold days (<65). When I start it it immediately goes up to about 1800 rpm and slowly climbs to about 2100 rpm. After I drive it for a couple minutes it drops down to a more normal idle. On warm morning (65+) it idles fine on start up. I'm guessing this is related to the IAC but I was wondering if anyone has experienced this and found a different solution.

A vacuum leak would be my first guess.

 

[Bad Luck]

What does it idle at once it's warmed up?

 

[texadelphia]

Idles around 750-800 once warm.

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[Bad Luck]

Idles around 750-800 once warm.

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Likely not a vacuum leak then. I would be leaning more towards a problem with your IAC. It could just be dirty if you've never cleaned it.

 

[TucsonMike]

R U sure it's not normal? My v6 5speed high idles when weather is cold and kicks down to normal once warm. I noticed today my idle was around 1500 on startup and temp in Tucson is around 70. Unless ur vehicle idle starts acting erratic I wouldn't worry about it.

MikeM

 

[cl4Rk]

R U sure it's not normal? My v6 5speed high idles when weather is cold and kicks down to normal once warm. I noticed today my idle was around 1500 on startup and temp in Tucson is around 70. Unless ur vehicle idle starts acting erratic I wouldn't worry about it.

[MENTION=605073]texadelphia[/MENTION] Yeah, I idle at about 1200-1500 on a cold start until I warm up a bit and settle down to about 750, especially if it's not very hot outside. I should clarify it's a smooth 1200-1500, it's not rough. If it's smooth, and consistent, then maybe it's normal? Or at least OK? But that climb to 2100 sounds strange. I like [MENTION=319302]Bad Luck[/MENTION] 's IAC idea. Make sure to position the IAC cavities upside down when spraying the TB cleaner. This is to allow the gunk to drain out instead of collecting/pooling inside there.

 

[texadelphia]

Yeah, 1500 would seem normal to me. But 2000 seems excessively high to me and it didn't do that at all last winter.

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[19963.4lsr5]

R U sure it's not normal? My v6 5speed high idles when weather is cold and kicks down to normal once warm. I noticed today my idle was around 1500 on startup and temp in Tucson is around 70. Unless ur vehicle idle starts acting erratic I wouldn't worry about it.

MikeM

Mine is the same. My saturn does it too.

For my 3.4 I can tell the instant it goes closed loop. It’s when it starts dropping the idle.


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