Question about 1999 Saturn SL

3 Answers

High idle on my 1999 Saturn SL1. The mechanical screw on the idle cam is at its minimum. The car idles at 13-1500 rpms .

Posted by on

  • gnvtele Oct 08, 2008

    have a 98 satun sl1 and have a idle problem only when the weather starts to get cold idles around 1500 to 2000 rpms come to a stop sign and idle goes to norm start going and idle goes back to 1500 to 2000 range

  • Anonymous Nov 30, 2008



3 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Clean the Idle Air Control Valve. It's on the throttle body below the Throttle Position Sensor. Worked for me! Good luck.

Posted on Oct 15, 2009

  • gwww Oct 16, 2009

    Here's a better explanation: The IACV is on the back side of the throttle body (nearest to the firewall), below the throttle position sensor (the TPS is in-line with the butterfly valve shaft), and is held on by two star screws and has a four-pin electrical connector. It's easy to remove, clean with a toothbrush and choke cleaner and reinstall. It rarely goes bad and needs to be replaced, just needs a regular cleaning (every 100,000 miles or when needed). Make sure you also clean the hole it came out of, otherwise it won't seat properly (use a mirror). The IACV is like a giant needle valve. Good luck! Twenty-five cents worth of spray cleaner sure beats the hundreds of dollars worth of parts and tools that I spent and still didn't fix the problem. I'm a lot smarter now!


  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 4 Answers

A vacuum leak would appear at all times. If this happens when the weather gets cold, you should be looking at your thermostat and/or temp. sensor. I had to replace both on my car, which solved the high idle problem. First, the temp would take FOREVER to come up, which was caused by a bad sensor. Second, it'd never go above 1/4, which was due to a bad thermostat. The stock thermostats in these cars have an unnecessary rubber gasket that goes bad on the little valve that opens and closes. When it cracks and falls off, it makes for holes where the coolant can leak past. Aftermarket thermostats do not have this unnecessary gasket. Also, replacement thermostats come pre-mounted in a new housing, so there's no need to remove the old thermostat from its housing (difficult--press down on STRONG spring and turn..somewhat dangerous, too).
To diagnose your car, get a meat thermometer. Drive around for at least 15 minutes, if not longer (longer is better). Park car with engine running. Place meat thermometer in overflow tank. Dash gauge should be reading between 1/4 and 1/2, and meat thermometer should read at or above 180 degrees. If thermometer is above 180, but dash gauge doesn't go above 1/4, then sensor is bad. If meat thermometer is below 180 degrees, then thermostat is bad. Also, if dash gauge takes a really long time to come up (longer than 10 minutes), then sensor is bad. Meat thermometer should read above 180 degrees and dash gauge should read between 1/4 and 1/2. Idle won't come down completely until the gauge registers somewhere between 1/4 and 1/2. If the gauge never gets above 1/4, idle will stay quite high.

Posted on Dec 10, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has written 7 tips or uploaded 3 video tips

  • Master
  • 674 Answers

Sounds like you have a vacume leak

Posted on Sep 11, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Why is the service light on in my saturn sl1?

sc1 means saturn coupe with a single overhead cam engine sl1 means saturn sedan with a single overhead cam engine same engine and same parts for both these cars

Dec 10, 2012 | Saturn SL Cars & Trucks

1 Answer

1996 Saturn dbl overhead cam -idle is extremely high -turned down idle screw all the way -still revs -help!

you should not mess with idle screw, you are changing tps values,computer controls idle,check for vacum leaks,may be a hose or intake gasket.

Sep 19, 2009 | 1996 Saturn SL

2 Answers

My 1996 Saturn SL1 runs very sluggish w/A/C on

idle is too low you see the problem with saturn sl1 is its a single cam engine that puts out only 100hp and when you get into low idling such as 800 rpms where it should be idling at when you hit the a/c the rpms drop a good 150 so turn the idle up more or is it during driving conditions?

Jun 13, 2009 | 1996 Saturn SL

1 Answer

My 2001 saturn with the 1.9l in it idles at 1200 rpms?

if its the single cam engine,you got a leaking intake manifold gasket,let it idle high,its a vacum leak ,,

Jun 07, 2009 | 2001 Saturn SC

3 Answers

1999 saturn sl1 rough idling

a pit\ston might not be working properly

May 29, 2009 | 1993 Saturn SL2

2 Answers

Saturn SL 2002 High Idle

Intake manifold gasket. Leaking where intake meets head.

May 07, 2009 | 2002 Saturn Sl

2 Answers

Idle runs too high when I come to a stop, for about 5 seconds.

The throttle body may need to be cleaned. Take off the induction hose to the throttle and open the plate. Make sure the vehicle is not running. With the throttle plate wide open, soak a cloth rag with carb and choke cleaner and work the rag around the inside of the body especially where the plate's closed position is. remove the rag and spray a small amount of carb cleaner down the throat of the throttle body. replace hose and run vehicle at 1500 rpm's for a few seconds. This should fix the idle. It should be idling at about 800 rpms.

Apr 24, 2009 | 1999 Saturn SL

1 Answer

2002 saturn sl1 idle too high

Can be but also check and make sure there are NO vacuum leaks or broken vacuum hoses anywhere on intake. I would also suggest if engine light is on is to take this vehicle to an AUTO ZONE they will check by computer for this problem and let you know for FREE. When you get the code I would be more than glad to help you further. Don't guess you may be wasting money and time. Good luck and thanks for using FIX YA

Feb 01, 2009 | 1993 Saturn SL1

1 Answer

2002 Saturn idling high then drops to normal

Your 2002 Saturn car has an electrical recall .I think its the ignition modual.Owners should contact saturn @ 1-800-553-6000, Prompt 3
Please remember to rate my help in this matter ! Thankyou!

Nov 13, 2008 | 2002 Saturn L-Series

Not finding what you are looking for?
1999 Saturn SL Logo

1,930 people viewed this question

Ask a Question

Usually answered in minutes!

Top Saturn Experts


Level 3 Expert

71694 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22082 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7031 Answers

Are you a Saturn Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides