right rpm at idle???

**bmwmteam** · 08-31-2007, 06:19 PM

my 99 t/a idles at about 750 rpm is this normal what is engine idle set at

**Wesman** · 08-31-2007, 06:32 PM

Manual or automatic?? That makes a difference. My M6 idles at around 1,000RPM, I believe thats normal for a manual LS1.

**Empatho** · 08-31-2007, 10:07 PM

mine is auto and it idles at 600 rpm

**ATCharming** · 08-31-2007, 10:31 PM

my car idles at 1k, sometimes 1500, sometimes 2200 rpms. it just decides how fast it feels like the engine shouldbe going.

but mines a thirdgen... my dads 05 colorado sits at about 700 once in a while. it shouldnt be a problem... if it doesnt die, ur fine

**9T8W66** · 09-01-2007, 03:43 AM

I've never seen a Factory Tach that read right, My tach has read 1000 rpm at idle since the car was new, but I had the car on a Tech II scanner before and it read around 800 rpm.

**01outlaw** · 09-01-2007, 04:50 AM

m6 here and at 700-800

**SeVeReDiStOrTiOn** · 09-01-2007, 05:53 AM

In gear 750 is a little high for a automatic...mine idled around 550 in gear at running temp and so does my truck. You could always clean the IAC valve just for shits and giggles...other then that it has to be tuned through software to change the idle.

**ATCharming** · 09-01-2007, 07:38 AM

Originally Posted by SeVeReDiStOrTiOn

In gear 750 is a little high for a automatic...mine idled around 550 in gear at running temp and so does my truck. You could always clean the IAC valve just for shits and giggles...other then that it has to be tuned through software to change the idle.

? im confused. my car goes down in rpms when in gear at idle

in park or neutral it sits at like 2k sometimes, but in drive its always at 1k

**jimmy77611** · 09-01-2007, 07:43 AM

Originally Posted by ATCharming

my car idles at 1k, sometimes 1500, sometimes 2200 rpms. it just decides how fast it feels like the engine shouldbe going.

but mines a thirdgen... my dads 05 colorado sits at about 700 once in a while. it shouldnt be a problem... if it doesnt die, ur fine

Your throttle body probably needs to be removed and cleaned out, including the iac and all of the vacuum ports. I'd check for vacuum leaks also.

**SeVeReDiStOrTiOn** · 09-01-2007, 08:05 AM

Originally Posted by ATCharming

? im confused. my car goes down in rpms when in gear at idle

in park or neutral it sits at like 2k sometimes, but in drive its always at 1k

My old 92 silverado had the same engine as your maro except it was a 350...it idled about 600 in gear when warm and about 900 out of gear. It sounds like someone raised your idle for some reason or there's a problem/leak somewhere..i'd spray carb cleaner all around the TBI unit and the manifold to check for vacuum leaks.

**ATCharming** · 09-01-2007, 01:25 PM

Originally Posted by SeVeReDiStOrTiOn

My old 92 silverado had the same engine as your maro except it was a 350...it idled about 600 in gear when warm and about 900 out of gear. It sounds like someone raised your idle for some reason or there's a problem/leak somewhere..i'd spray carb cleaner all around the TBI unit and the manifold to check for vacuum leaks.

well.... id have to take the tbi unit off to spray it right? that shit CANT get into the engine... right?
if so, im not gonna bother. i got someone comin to look at it tomorrow and its not a problem yet. ill just tell him about it

thanks for the info tho. ill def. keep it in mind
also, my tach might just be off cuz it shifts at 6500rpms when it should be shifting at 5k...

**Empatho** · 09-01-2007, 10:06 PM

mine shifts around 6200 rpm give or take, maybe yours had a tune done by a previous owner.

**ATCharming** · 09-01-2007, 10:07 PM

Originally Posted by Empatho

mine shifts around 6200 rpm give or take, maybe yours had a tune done by a previous owner.

mine is a thirdgen. should never shift that high

**Empatho** · 09-01-2007, 10:14 PM

thats when Im going wot lol I have an LS1 and I remember that my friends LT1 would shift around the 6000 RPM

**SteveC** · 09-02-2007, 07:01 AM

Originally Posted by jimmy77611

Your throttle body probably needs to be removed and cleaned out, including the iac and all of the vacuum ports. I'd check for vacuum leaks also.

I strongly second that opinion, it sound like the throttle plate is sticking open partially.

SteveC

**thecorrectformula** · 09-02-2007, 09:52 AM

Mines at 1,100 at idle but I'm cammed

**car guy** · 09-04-2007, 03:34 PM

Hey my tach says arount 450 at idle but sounds fine. I wouldn't go by the tach there not right

**sic2001** · 09-04-2007, 06:16 PM

which vaccum lines are we talking about? Any pics? My tach is off but I suspect the 1st owner when he put the white face gauges on. Id still like to checj the vaccum lines though if theres pics