Question about 2000 Oldsmobile Alero

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2000 alero idles up and down

2000 olds alero when idleing goes up and down

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 99 OLDS ALERO 2.4 IDLING PROBLEM

intake manifold has a vacum leak or other vacum leak hose etc.

Posted on Dec 03, 2008

  • 321 Answers

SOURCE: 99 olds alero 2.4

I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Posted on Dec 04, 2008

godspeed808
  • 125 Answers

SOURCE: olds alero 2.4 idle fuel pressure

most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Posted on Feb 26, 2009

  • 1986 Answers

SOURCE: 1999 olds alero 2.4 idles rough and stalls when

When did you last change the spark plugs, distributor cap, ignition wires, ignition coil, fuel filter, or the fuel pump? Any one of these could causing your care to stall. Also, have you been using regular gas or premium as premium gas can cause your engine to not combust properly if it wasn't designed for premium

Posted on Aug 07, 2009

  • 4 Answers

SOURCE: 2000 oldsmobile alero fast idle

Just fixed mine today, check the vaccum tee off the manifold to the check valve, mine was cracked, repaird with electrical tape for now.

Posted on Aug 22, 2009

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1 Answer

My alero idles fast


Usually a sign of a faulty idle air control valve, a sticky throttle plate, or a vac leak.
The computer uses the control valve on the throttle body to control idle speed by regulating how much air enters the throttle body and intake.

Jan 24, 2013 | Oldsmobile Alero Cars & Trucks

1 Answer

2000 Alero idles low and dies when stopped.


How does it idle when you first start or idle when hot.
On the top of the air intake tube there is a small screw which should when screwed in speed up the idle and if it dosent work or it idles fine when cold or warm at idle then its your GEARs are binding up and there's not to much you can do about that ........sorry

Oct 15, 2009 | 2000 Oldsmobile Alero

1 Answer

2004 Olds Alero with constant high RPM


Try cleaning the throttle body. Possible idle air control valve problem.

Mar 15, 2009 | 2004 Oldsmobile Alero

1 Answer

Olds alero 2.4 idle fuel pressure


most likely idle air control sensor or low engine coolant I know sounds funny but IAC uses coolant to regulate idle. Idle air control valve or throttle body positioning sensor.

Dec 10, 2008 | 1999 Oldsmobile Alero

3 Answers

99 olds alero 2.4


I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Dec 03, 2008 | 1999 Oldsmobile Alero

1 Answer

2.4 olds alero enging stumble


The two most likly causes of your Idle problen are, low fuel pressure. try installing a new fuel filter. Or the other one is the Air Idle control valve, can cause the exact problem you discribed with a cold engine. Fuel Injection engines do not have a choke like carburated engines do. So the idle is computer controled thru the Air idle control valve.

Sep 25, 2008 | 2001 Oldsmobile Alero

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