**HELP** 93 SC2 Idling at 3,000 rpms

[seiguy]

Not a single code... Of course, its my car, it couldnt be easy... lol
When you first start the car in the morning, it idles between 800 - 1000 rpm, when you drive the car to operating temperature, and put it in park or neutral, the idles sit anywhere from 2,500 - 3,000 rpm, but ONLY when the car is warm, not when you first start it. With it in drive, reverse, or any gear other then park and neutral, it idles at 800 rpm, it doesnt bog down when you hit the gas, even if you slam on it, it doesnt sputter, it doesnt stall, etc... I had the car running today when the idle was up, and sprayed an entire can of carb cleaner over every vaccum line in the vicinity of the throttle body, the pcv valve was replaced today along with the hose going from the manifold to the pcv valve, and new clamps where put on to ensure it was tight, the throttle body was cleaned, etc, it is all shiny, I tried plugging the vaccum line going to the egr valve, no change... Im so lost. lol. What should I concentrate on now... You mentioned a vaccum line on the firewall...? What about the knock sensor? or the PCM going bad? But I would think any of those would trip a code... A few times today when the car was turned off and back on, the idle remained at 1,000 rpm, even after driving it, but that was only like 3 times out of maybe 11 - 12 of it being started today.
Anyone in NH wanna buy a 93 Saturn SC2 with 18" rims and 215/35/18 tires? rofl

[bmwgolfguy]

I didn't take the time to read all the prior advice posts. But I can tell you I had a 96 LeSabre that I couldn't keep under 60mph without the brakes.

It was a bad computer chip/brain which was a $750.00 fix.

Good luck!

[yaz4real]

This SC is a charm all right.

The large vacuum hose coming off the brake booster going to the intake manifold is on the firewall in front of the driver's position. Check that out good. Its round and black with a hose in the middle of it. Check that connection and follow it all the way to its other connection. Check the entire length for fraying or cracking.

Have you taken the EGR off and clean it from underneath ensuring the pintle runs well. Carb cleaner, a toothbrush and dental tools. DO that and before putting it back on, start the car so it will blow any build up inside out. Make it brief and it will be loud.

[seiguy]

I havent tried cleaning the egr valve, I tried taking the vaccum line to it off and plugging it, and it didnt make any difference... I will try taking the egr valve off and cleaning it today, and I will look into that vaccum line and let you guys know

[seiguy]

So I tested all of the connectors, the one going to the coolant temp sensor, TPS, IACV, and MAP Sensor, all are right on per the specs in haynes manual... I called the saturn dealership and all the guy could say was 'The three most likely causes are a bad connector to the CTS, bad egr valve, or a leak in the intake manifold gasket.... *Sighs*

[cory snelgrove]

I have a 2000 saturn sl1 5 speed sometimes i push the clutch in when im at a red light the car revs up to 3000 rpm's. sometimes when i shuts it off it will go back to normal sometimes it don't sometimes I have to do it several times before it goes back to normal. While the car is idleing the car bucks and it is not easy on gas for a 1.9 motor. I've brought it to a small garage he told me it could be the idling sensor and he said there are two of them there could this be it?
Thanks
Cory

[yaz4real]

http://youtube.com/watch?v=4ilHTkyWRpU


Those devices connected to the throttle body are likely what the mechanic is talking about however one is the throttle position sensor and the other is the idle air control valve.

[johnkowalchuk]

I have a 2001 sl1 saturn that when I bought it was doing the same thing and It was an Intake Manifold Gasket. To check spray some carb cleaner right where the intake mounts to the engine, If the idle drops replace the gasket. I replaced mine and the idle dropped to about 1300rpm that still wasnt low enough so I checked the idle control sensor that is supposed to drop the idle when the car warmes up it was cracked so replaced it with a new one and the car runs perfect. The old one looked like it was made of plastic the new one was brass. Let me know what happens.