Question about 1998 Saturn SL

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Engine reves up and down. have spayed carb. cleaner around trying to find a vacum leak, none found/ Please help!

Have changed O2 sensor,EGR, and Air cleaner.

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You have a bad idle air control valve it is located to throttle body next to the throttle position sensor

Posted on Dec 07, 2012

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Posted on Jan 02, 2017

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SOURCE: Engine Coolant Temperature sensor

choke stuck . check and see if the car has a senor on the carb and spray around the base of the carb . but i think the high ide senor is bad .

Posted on Jan 21, 2009

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SOURCE: EGR Valve, O2 Sensor

Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.

Posted on Jun 06, 2009

SOURCE: stumbles when u 1st accelerate,quits on take off

one it could be a valve not producing the right pressure.faulty emission system,or defective pcm or information system.i hope this helps.

Posted on Feb 10, 2010

  • 158 Answers

SOURCE: getting a code 172 rich fuel cond 1.9 liter

you might want to check the intake for leaks-let the engine run-while running spray some brake cleaner around the intake-if the engine boggs down or dies that means your intake gasket is leaking and needs replaced-this is very common

Posted on Feb 17, 2010

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SOURCE: 2002 1.9 sohc mp efi missing badly on #1 cylinder.


Posted on Nov 13, 2010

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I have a 90 silverado 5.7 an it just started to idle very high then low cutting out popping an dying on me. I noticed it will start an run fine until it gets to operating temp. Then it acts like sumone us...

Have you tried cleaning the MAF sensor. This sensor is by the air filter box. The mass air flow sensor has to be cleaned with a special spray that you can get at any auto parts store. Do not, I repeat do not use carb cleaner this will ruin it. It is basically a thin filament housed in a grid where the air flow goes through and if it gets coated by dust, oil, or burning to rich black soot this will throw the signal off just enough at the computer.

Nov 17, 2013 | Cars & Trucks

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Idling Problems

the rise in idle at startup and then a slowdown indicates possibly a throttle position sensor, sticking choke or a vacum leak. the TPS and choke is something that will have to be checked by a tech, the vacum leak can be found by starting the car and sticking your head under the hood and listen for a hissing noise that sounds like air escaping somewhere......if you can find it, and put your hand or fingers over the leak, the idle should rise and then you'll know that's your problem. this is entirely possible due to the age of the car, the number of miles on it and the fact that most of the vacum attachments usually use rubber hoses which will deteriorate over time and cause these types of problems

Jul 18, 2008 | 1998 Mitsubishi Eclipse


Old school proplem solver

ok this can be applied to just about any vehical ever made ...but my experience is with ( for this case) my 1991 jeep cherokee..i had all kinds of proplems and codes...they consisted of hard starting, reving up and down, cutting out,(engine dying), worse and worse gas milage..stumbling..o2 sensor codes( fault o2 sensor)..bad isc motor..bad map sensor...bad temp/thermostat and my brakes kept getting worse..(softer and i started posting my proplem all over the net and even broke down and took it to a jeep service center...i spent well over seven hundred dollars and still most all of the proplems i referd back to an old and very simple way to search for proplems with any motor...(cheapest way first) well i guess not least not for me haha..i started unpluging the different sensors while the engine was running to see if there was any change and every one seemed to change things a little i then took a can of carb cleaner and started spraying ever gasget surface and vacume hose...!!!!..i found that the engine changed pitch every time i sprayed the intake gasget...!!! i bought a new one for ten dollars ...spent 4 hours to replace it .. and it fixed every one of the proplems i sounds crazy but if you put a little thought behind it makes perfect sense...o2 was reading faulty and lean(more oxygendue to leak)..brakes were getting softer(due to drop in manifold vacume) map sensor was reading faulty and causeing stumble and cut out (also due to drop in manifold pressure) temp/thermosate reading due to idle air temp (which needs to coencide with temp sensor) not recieving proper air flow reading also due to leak...well as much as i can go on about this i am just posting this where i can i hopes that my adventure saves someone a little money....remember i spent over 7 hundred before figuring out this simple ten dollar fix!!!! and since the intake and exhust share a common gasget it is pron to leaks....good luck and i hope this helps

on Jan 14, 2010 | Jeep Cherokee Cars & Trucks

1 Answer

Keep getting same 3 codes, MAF, random misfire and EGR I have replaced air and fuel filters, Mass air flow sensor, cleaned the EGR and reinstalled, replaced plugs which were old, cap, rotor and wires all...

No vac leaks...have you put a vacuum gauge on a manifold tap and checked the vacuum reading? Vacuum should be steady at 17-22 inches. If much lower than that, below 15 inches, you may still have an air leak-check the intake manifold gasket, and throttle body assembly gasket. Spray carb cleaner around the sealing areas while engine running, listen for rpm surge or change in pitch. Does the big air boot have any tears or punctures, and is it clamped down tight?

What is the fuel pressure reading? Does it match specs for your vehicle?
A cylinder compression test may be called for if you cannot find any other reason for the misfires. Look for low compression figures that may signal a valve problem, or valve timing problem.

Oct 31, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

My 1991 ford 150 with a 351 engine fuel injection is reving up to 25000 turns just sitting parked it goes up and down on the revs. can the problem be my egr???

Yes it can be an EGR valve which would be like a vacuum which sounds like your problem. You can take a can of carb cleaner and spray it around the EGR valve an vacuum lines as well as along the intake manifold. If the idle changes when spraying in a certain location, you have found the area where the vacuum leak is & can narrow it down from there. I hope this helps and good luck.

Jul 19, 2011 | 1991 Ford F150

1 Answer

99 mercury sable automatic trans vehicle idles very low randomly even stalls out sometimes high idle occurs as well reaches about 4000 rpm at times. engine light threw 4 codes, all to do with o2 sensors...

Sounds like a broken or torn vacum hose, pcv valve clogged, or bad Idle air control motor. Did you spray carb cleaner on vacum hoses or near the plastic intake., and did the motor rev up or down? Those codes represent a lean condition which means most like a vacum leak or clogged idle air motor. Sometimes the intake manifolds crack or the intake manifold gaskets crack. FInd that vacum leak or inpect iac motor

Oct 28, 2010 | Mercury Sable Cars & Trucks

1 Answer

Rough idle check for vacume leaks found none. Replaced o2 sensor,egr valve, spark plugs and wires still runs rough and gets worse when you put a load on it.

I had this problem with a Mazda I had and I did everything I could think of.  Check for vac leaks again and then check air cleaner hoses.  I suggest this, because I found mine right smack dab in the crevasse of the air intake for the air cleaner.

Apr 01, 2010 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Why does my rpm rev while stopped at a traffic light?

There are so many things but here are a few to check.

  1. With the engine running raise the hood and see if you hear any hissing sound. What you are looking for is a vacuum leak. The vacuum leak caused the idle to raise.
  2. Use a can of fuel injection cleaner and spay around the intake area while it is running. If you hit a spot that makes the idle come down a little, test it a few times to verify. You have found a leak probably in the intake gasket area.
  3. Have a scan done. you could have a problem with the idle air control, air temp sensor, or egr. If it says egr, it is more likely an item called the DPFE. There were so many of them replaced in the late 90's and early 2000's that you almost never replace the egr it was always the DPFE. (it is cheaper than the egr too.)
Hope this helps

Nov 22, 2009 | 2003 Mercury Mountaineer

3 Answers

When stopped (car in drive) the idle drops and the engine wants to stall out. I was told I needed to replace the EGR cable?

EGR movement limited/blocked by carbon.


Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE

Also remove carbon built up behind the EGR valve and the EGR passage tube.


Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.


EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.

Take it for a test drive.

Please rate my answer if it's useful to you.



Aug 06, 2009 | 2000 Ford Taurus

3 Answers

Bad idle 87 Ford Ranger 2.9L V6

Sounds like it is loading up on gas, try using a cleaner in your fuel, or a aerosol can of cleaner that you can spray directly into the carb. while it is running. It this seems to help you may need to have it rebuilt.

Nov 04, 2008 | 1987 Ford Ranger

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