Question about 1999 Saturn SL

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99 saturn sl runs rough. like its missing, changed the plugs but only helped for a day.

Its worse when the car is cold

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  • 373 Answers

Try cleaning the EGR valve. It's located at the right hand side of motor, beside the valve cover. It is round tubular and has a plug going to it.. first take your air filter hose off flat head screwdriver Remove the plug from the EGR. There is then 2 10mm bolts to take out to remove EGR. When you pull EGR off, be careful not to damage gasket. Inspect gasket for wear as well. Should be replaced anyway. When you get this out take your finger and push the plunger in. At THIS time, take notice if the valve is sticky. If it's hard to push in, or sticks at all, this is the time to tell, because once it's pushed in once, it will unfreeze itself and you will never know if it was sticking. With a screw driver push plunger in and out to free it up. The spring should be strong enough to push plunger out, and seal the hole. You can clean the plunger up with engine cleaner. Replace the opposite as removal. The EGR is responsible for the recycling of the exhaust fumes, and can cause this if it is dirty or bad. The next thing you have to do, is remove the throttle body and clean it. Easy as well. the throttle body is on the other end of the air filter hose. 2 10mm bolts as well. First pull vacuum hose off the top being careful not to lose the rubber gromet in between. Once that is off, remove the 2 bolts and be careful of the gasket there too. Once TB is free, turn it and disconnect the cable. When the EGR is bad, the backside of this TB gets carboned up. There are 2 sensors on the TB. One is the IAC [ idle air sensor ] and the TPS [ throttle positioning sensor ] Remove these with a torx 20 socket or screwdriver. You will see on the bottom sensor an O ring. Be careful not to lose it. You will then see another plunger , mushroom shaped thing. Do not force this to move, just clean it thoroughly, and clean the jet of the TB where this part seats. You can just leave the TPS on the TB, as that doesn't seem to be part of the problem. Clean TB good. Look at and clean the 2 holes for vacuum, and scrape and clean the backside of the TB. Put her all back together and Voila!! Car should work better. If that is the problem, great, if not I can guide you to further tests Let me know

Posted on Jan 18, 2013

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Posted on Jan 02, 2017

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SOURCE: idling up and down between 1200 and 800 rough idle 2002 saturn sl

oooooooooooo my friend white smoke mens head gasket is gon sorry

Posted on Dec 11, 2009

jgwhomeequip
  • 1902 Answers

SOURCE: egr valve on a 99 saturn sl

Take it off and look at it internally, See if you can move the diaphragm if not then it needs replacement. But you should just go ahead and replace it anyways since it is a 99 it would just be worth it

Posted on Feb 11, 2009

  • 13 Answers

SOURCE: 93 Saturn SL was running a little rough, would

sounds like you have some bad injectors. if your smelling fuel it sound like one of them are stuck open. that would cause it to run rough. i think the injectors are like 35 each i would put them in and run a fuel system cleaner and put a new fuel filter when you do all that.. if you do it yourself it should run you about 180 to 200. Its not that hard to do. If a shop was to do it it could cost up to 500

Posted on Jun 27, 2009

  • 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

  • 6 Answers

SOURCE: I have a 99 saturn sl2 is running rough i`ve

Try replaceing the ECT sensor. Mine was doing same thing, this SOLVED my problem!!

Posted on Mar 30, 2010

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1 Answer

99 saturn revs high rpm drop slow rough idle in gear with ac on almost a miss


Put the car in the darkest environment you can and with the engine at idle, look around the high voltage leads; plug wires, etc. I replaced my lousy leads after about 2 years.
If you have a multimeter, you may be able to isolate one or more bad leads by measuring their resistance. It should be ~7-10Kohms, mine were nearly open (infinite) on two.

Sep 02, 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

Idling up and down between 1200 and 800 rough idle 2002 saturn sl


oooooooooooo my friend white smoke mens head gasket is gon sorry

Dec 11, 2009 | 2002 Saturn Sl

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Feels and sounds like it is missing -starts with no problems runs rough usually every gear(1996-5-speed) Could it be a vacuum hose--How do I know?


If it is a vacuum hose, the vehicle will idle fast. Take a spray bottle and put some water in it and while the engine is running spray it around the spark plug wires. If it gets worse around a particular wire, replace that wire, better yet replace all of them and put in new plugs, but get the plugs from Saturn garage, the wires will be ok from Advance or wherever, but not the plugs.

Nov 29, 2009 | 1996 Saturn SL

1 Answer

Just bought a 2000 saturn sl class. runs rough at start-up, runs great when warmed up. changed fuel pump and filter, plugs and wires. no difference. guessing throttle control (choke)


The problem here is the ECTS. Engine Coolant Temp. Sensor. It cost around $12 dollars and takes maybe 5 mins to fix with a 13mm socket. Saturn SL series built before november 2001 have a plastic ECTS. When you buy the new one make sure it has the brass tip as some parts stores still carry the cheap plastic one

Oct 27, 2009 | 2000 Saturn SL

1 Answer

93 Saturn SL was running a little rough, would


sounds like you have some bad injectors. if your smelling fuel it sound like one of them are stuck open. that would cause it to run rough. i think the injectors are like 35 each i would put them in and run a fuel system cleaner and put a new fuel filter when you do all that.. if you do it yourself it should run you about 180 to 200. Its not that hard to do. If a shop was to do it it could cost up to 500

Jun 09, 2009 | 1993 Saturn SL

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