raising idle RPM

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KU40
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raising idle RPM

Postby KU40 » Thu Aug 24, 2006 11:14 am

How does one go about doing this? Is it controlled by the computer or just by a mechanical adjustment in the throttle body somewhere? I'd like to raise my idle 50-100 RPM's or so, are there any adverse effects of this besides lower gas mileage?

my car runs fine when it's cold and the idle sits around 1k, but when it warms all the way up and the idle falls (don't remember what number it sits at, around 700 I think), it doesn't run as well.

my car is a 91 olds cutlass supreme with the bastardly 3.4.
-Nick aka NS1 aka mopey aka speedbump
Alpine CDA-9827
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SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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John
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Postby John » Thu Aug 24, 2006 2:59 pm

Depends on the vehicle usually, but in that car I think you could do it manually. You'd probably just need to remove the air intake pan to get at it. The problem is that the cable is already under tension and is probably very hard to just 'tighten up' and increase the throttle by that small amount you want. Check it out, it may have a tension/tightening feature. If it could be done easily, go for it, otherwise I wouldn't reccomend it.

Primary adverse effect that comes to mind is that your car would be idling at a higher rpm which could in the long run add more wear on the engine. Another problem might be the shift points & red line on the automatic trans...
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KU40
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Postby KU40 » Mon Aug 28, 2006 5:31 pm

ok thanks J to the ohn. anybody else know how to do it for my car? might just have to go find a forum dedicated to my car/engine.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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Sound_Miata
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Postby Sound_Miata » Tue Aug 29, 2006 9:56 am

idle adjustments will not affect shift points nor redline. it simply raises the rpm at which you idle.

why are you concerned with raising it? it is idle, you shouldn't need to worry about performance at 700rpm.

What John is talking about is adjusting the throttle stop to raise idle and is NOT the correct way. if you have poor idle/stutter at that RPM you most likely have other issues that need addressing, a vacuum leak, dirty injectors, something, fouled spark plugs, bad O2, etc. to raise idle to fix performance is just a bandaid and not the right solution.

-Greer
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KU40
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Postby KU40 » Tue Aug 29, 2006 1:57 pm

yeah i figured it was a bandaid, but I am a college student who doesn't have a ton of money to throw at my car and also not enough to buy a new one. I've taken my car to a couple mechanics and none have found a solution.

the problem is that when the car is fully warmed up, sometimes it just dies when I'm going slow, either braking in slow traffic or going around a corner (most common). it drops to normal down-shift RPM's, then just keeps going down and dies.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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Sound_Miata
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Postby Sound_Miata » Wed Aug 30, 2006 8:46 am

I don't think that raising your idle will fix this problem.

That kind of problem could be as simple as a vacuum leak (cracked hose somewhere), to a bad idle speed control (ISC) motor. Vacuum leaks are easy to hear when drastic, but harder to hear when slight. For best bets though, look up http://www.60degreev6.com they should be able to help.

-Greer
*Winner of the Beastly 1000th AND 2000th Post*

slappin momma llama on the backside-Joshie-Poo :-D



Vendors: We will allow you to break the laws of physics and the second law of thermodynamics so long as you provide us with a working model.
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KU40
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Postby KU40 » Wed Aug 30, 2006 1:04 pm

thanks Greer, trying that forum out.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)

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