Question about 2000 Oldsmobile Intrigue

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Loud whistling noise at idle

Extremely loud high pitched noise at idle - disappears while accelerating - Could this be caused by a vacuum leak at the fuel vapor/vent pressure sensor located at passenger side of air plenum??

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  • Ferret1 Jan 19, 2013

    That is likely your problem. When air plenum is replaced along with intake manifold gasket, it is done to prevent anti-freeze from leaking into intake manifold area which causes hydro-lock and ruined engine. But you must carefully follow instructions with new plenum, because you must assemble the PCV valve and sensor properly at the passenger side of the plenum. If you don't, you can get a howling whistle sound like a trumpet or cornet that can be heard from 100 yards or more.

  • Ferret1 Jan 19, 2013

    Further, when accelerating engine, the howl typically disappears, until you resume the idle speed.

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Posted on Jan 02, 2017

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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

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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

godspeed808
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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

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SOURCE: even when air is off, hot air comes out all pass side vents

it is the flap door inside the heater box area.alot of gm with electronic climate control have the problem.there is an actuator motor that needs to be replaced.

Posted on Jun 14, 2009

  • 236 Answers

SOURCE: ac system

take the dash off to see if the vents are connected to the dash. if not, the heat from the engine is blowing through the open hole

Posted on Jun 17, 2009

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