Question about 1999 Saturn SL

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Why does my 99 saturn sl idle erradically sometimes?

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  • 373 Answers

One of 4 things. Your TPS [throttle positioning sensor] IAC [ idle air sensor ] vacuum leak, or intake manifold gasket getting bad.Easy test for you to do before you get into replacing parts is as follows. Start car, and take some engine cleaner spray, and spray directly onto the gasket where the intake manifold bolts onto the block. Spray liberally. If you hear the engine RPM'S change in ANY way, your gasket is bad. These cars are well known for this. I suggest that you try this first and get back to me. If this is not it, I can walk you through the next easy tests. Let me know, but if I were a gambling man, I'd gamble on it being the intake gasket. $40, and 2 hours to do it yourself. I also made a video while I was doing my own. Let me know if this info is helpful

Posted on Jan 18, 2013

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6ya6ya
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Posted on Jan 02, 2017

  • 80 Answers

SOURCE: where is the wiper motor on a 99 saturn sl

the wiper motor is located under the black cowel at the bottom of the windshield. remove the wiper arms and the cowel.

Posted on Mar 11, 2010

  • 141 Answers

SOURCE: where is fuel filter located for 99 saturn sl

Under the car inside the left or right frame rail. Follow the lines out of the tank and you will run right into it.

Posted on Jan 09, 2009

  • 1 Answer

SOURCE: How do i reset the

Depending on what state you are in, parts stores are not legally allowed to clear codes, only read them. Most of the time if you disconnect the battery for a few minutes, than reconnect it will clear the memory, however the light will come back on if there is an actual problem.

Posted on Mar 06, 2009

countrysi248
  • 443 Answers

SOURCE: 99 Saturn SL no overhead lights or lights on 'ding'

this device might be on a relay check under the hood for a power distribution box.. and see if there is a relay for this .. under the lid of this box is a diagram telling you which relay is which .. thanks Jerry

Posted on Apr 25, 2009

drsinister69
  • 2317 Answers

SOURCE: 95 SATURN SL 94000 MILES ON IT SHAKES WHEN IT IDLES IT

You could have a vacuum hose disconnected or a hole in a vacuum hose. See my "How To" on finding a vacuum leak.

Posted on Apr 24, 2010

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1 Answer

99 sl1 with 1.9 has high idle and will not idle below 1200 in drive


remove the throttle body (4 bolts) and then remove the idle air control (bolted to the TB, between the firewall and the throttle body)-clean the TB, the Idle air controller and remove the Throttle Position Sensor (opposite the IAC) and clean it if necessary. The IAC carbons up on these cars, as does the Throttle body-I know, I have a 99 SL with 180,000 miles, it is almost like an oil change as they get older.

Feb 18, 2011 | 1999 Saturn SL

1 Answer

Have a 99 Saturn, rough idles, stalls, high RPMs when first started, then idles to rough idle, what is the first thing I check?


Sounds like the EGR is hanging open causing an internal vacuum leak.... Check all vacuum lines first for cracks / splits and then pull the EGR and make sure the pintle is not stuck open with a chunk of carbon.

Oct 15, 2010 | 1999 Saturn SL

1 Answer

99 saturn SL sometimes will turn over, and sometimes will not turn over Mechanic checked the starter, battery, alternator all were good. He changed out the tensioner and terpentine belt car ran fine for...


yes, it could have a dead spot on the commutator. Try hitting the starter with a hammer. If this works to get it turning, replace the starter. If you need instructions or have more questions, please let me know.

Sep 24, 2010 | 1999 Saturn SL

1 Answer

What's the difference bteween a 99' saturn sl and a saturn sl1? My 99' saturn sl wont go in reverse, what might be wrong with it?


The SL2 is a DOHC 1.9L and the SL1 is a SOHC 1.9L. They have different transmissions, the DOHC uses a 15 inch wheel while the SOHC has a 14 inch wheel. So when you are shopping around for another transmission you must get one from the same type of engine. Saturn auto transmissions seem to be problematic, I stuck with the manual trannys and had very good luck.

Aug 31, 2010 | 1999 Saturn SL

1 Answer

I have a 99 saturn sl2 is running rough i`ve replaced plugswires &coils still has A rough idle once you get going it runs great


I would guess it's fuel injectors that need cleaned but I found a great fuel injector cleaner. I believe it's Chevron Techron Fuel System Cleaner.

May 15, 2010 | 1999 Saturn SL

1 Answer

How do you turn down the idle on my saturn 99


replace the idle air control valve
the computer run it only
no adjustments can be made towards the idling

Feb 07, 2010 | 1999 Saturn SL

2 Answers

99 saturn sl1 hard to start if sitting for over an hour


you have leaking fuel injectors they are fouling out plugs.

Apr 22, 2009 | 1999 Saturn SL

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