IDLE on 2001 Corvette ? for you all....
Thread Starter
Too Much Fun
Joined: Sep 2004
Posts: 1,691
Likes: 205
From: Florence, AL
IDLE on 2001 Corvette ? for you all....
My 2001 Corvette with NO mods except predator idles at 500 rpms. I have a 99 that idles around 750 rpms. Idle is a little rough at 500 on my 01, is there ANY way to adjust what rpm I am idling at? Is there any adjustments I can make under the hood? ALSO, this weekend I am putting Magnaflow exhaust on car, will this raise my idle any?
THANKS,
Jamey
THANKS,
Jamey
Drifting
Joined: Nov 2001
Posts: 1,791
Likes: 0
From: NE PA
Originally Posted by JameyTurner
My 2001 Corvette with NO mods except predator idles at 500 rpms. I have a 99 that idles around 750 rpms. Idle is a little rough at 500 on my 01, is there ANY way to adjust what rpm I am idling at? Is there any adjustments I can make under the hood? ALSO, this weekend I am putting Magnaflow exhaust on car, will this raise my idle any?
THANKS,
Jamey
THANKS,
Jamey
The factory DIS (Desired Idle Speed) for an automatic car is 550 rpm in gear and 650 rpm out of gear. The idle speed of M6 cars is set at 750 rpm.
No, there is no mechanical adjustment that can be made and no, your exhaust will have no effect on it. The only way to change the idle on these cars is by editing the PCM via editing software like HP Tuners or LS1-Edit.
Burning Brakes
Joined: Oct 2004
Posts: 792
Likes: 19
From: ME
You know, other than what trooper reccomended you might just want to check to see how dirty your throttle body is. I haven't serviced a corvette throttle unit yet so I don't know how dirty they get... Check that though.
Safety Car
Joined: Aug 2000
Posts: 4,537
Likes: 84
From: St. Joseph MO
Cruise-In III Veteran
Cruise-In IV Veteran
Thats a pretty low idle. I'd look for a loose air bridge fitting somewhere as well as the dirty throttle body and such. Does the car surge during normal driving as wel?
Burning Brakes
Joined: Oct 2004
Posts: 792
Likes: 19
From: ME
you know what else, is that I've been finding the intake flex hose disconnected from the airbridge just above the radiator. Check for that too, it will look like it is on but try and move it around to see.
Drifting
Joined: Nov 2001
Posts: 1,791
Likes: 0
From: NE PA
Originally Posted by JameyTurner
I will check all hoses and connections tomorrow and let you all know my findings....if any other ideas are out there please share them with me....
BTW, the only air intake leaks that will affect your idle are post-MAF sensor as your motor will then be sucking in unmetered air. This usually causes a very rough idle and, depending upon how bad it is, your car may not idle at all.
Vacuum leaks will cause a high idle speed condition.
Good luck.
Last edited by XTrooper; Nov 10, 2004 at 11:25 AM.
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Drifting
Joined: Nov 2001
Posts: 1,791
Likes: 0
From: NE PA
Originally Posted by JameyTurner
Yes, xtrooper, 2001 A4....
Burning Brakes
Joined: Apr 1999
Posts: 947
Likes: 1
From: Lake Worth. Fl.,USA Fl
I have a 98 and the idle is around 550 in gear also. I wish I could get it up to 650 but no way unless an aftermkt reprogram. I had an idle update in 2000 and maybe GM lowered it down to 550. Maybe for emissions or something. I too would like to get it up higher?????? How is the 64000 $ question. Better make that a million . Is there a program that will just raise the idle only and nothing else?
Pro
Joined: Sep 1999
Posts: 545
Likes: 0
From: San Jose, Ca./Kona, Hawaii
My stock 98 auto also idled at 550 in gear. Around 600 in Park.
Since installing heads/cam, I raised the idle to 800 by computer reprogram. Nice and smooth.
Unless you have access to a computer reprogram, some head/cam guys raise their idle by drilling a small hole in the throttle body plate, lower half. They say it doesn't hurt. 1/8 drill bit seems to be the popular choice. However, I would persue going the computer route first.
Since installing heads/cam, I raised the idle to 800 by computer reprogram. Nice and smooth.
Unless you have access to a computer reprogram, some head/cam guys raise their idle by drilling a small hole in the throttle body plate, lower half. They say it doesn't hurt. 1/8 drill bit seems to be the popular choice. However, I would persue going the computer route first.
Last edited by davette; Nov 12, 2004 at 12:59 AM.
Burning Brakes
Joined: Apr 1999
Posts: 947
Likes: 1
From: Lake Worth. Fl.,USA Fl
Thanks for input. I tried that but it really didn't make that much difference . I agree the computer route is the best way. Most places want you to buy the whole program. I just want to modify the idle. If someone has an LS 1 edit that would be fine and if they know how to edit that one parameter. I don't know if this could be done or where.
Burning Brakes
Joined: Apr 2003
Posts: 908
Likes: 2
From: TROY MI
THe low idle speed is for fuel econmy.The EPA driving cycle that measures fuel economy has a LARGE perctage of idle in it.Think about it you get zero mpg sitting at a red light.The lower the idle speed the less fuel you burn because you are controlling to the same A/F ratio.
I have a 02 vert. and had the same idle speeds 500/550 area. When I put the TC in we bumped the idle speed to 650. It runs real smooth at this speed.I did this via a custom tune with my predator.
I have a 02 vert. and had the same idle speeds 500/550 area. When I put the TC in we bumped the idle speed to 650. It runs real smooth at this speed.I did this via a custom tune with my predator.
Pro
Joined: Sep 1999
Posts: 545
Likes: 0
From: San Jose, Ca./Kona, Hawaii
Check out this website:
http://www.proautotech.com/
They are in Ft. Myers. 130 miles from you.
Maybe you have already called them. They should
be able to bump your idle for you. You might even consider doing a full tune. At least you would know your car is running at peak performance.
By the way, your new exhaust will not affect idle speed.
http://www.proautotech.com/
They are in Ft. Myers. 130 miles from you.
Maybe you have already called them. They should
be able to bump your idle for you. You might even consider doing a full tune. At least you would know your car is running at peak performance.
By the way, your new exhaust will not affect idle speed.
