Question about Oldsmobile Alero
The 2003 alero goes down the rode 50 mph without stepping on throttle
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.
Posted on Jan 24, 2013
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Posted on Jan 02, 2017
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
your ECU is faulty.
New ECU and voila problem fixed
ohh ECU= engine control unit
secondhand with do just fine.
get it fitted by professional
Posted on Apr 16, 2009
1999-2003 Honda Odysseys have trouble with their transmissions. Google "honda odyssey transmission" and look at the wikipedia article that comes up for Honda odysseys. In about the fourth paragraph you will find out about the transmission problems. If your van is acting up, have the transmission checked out sooner vs. later. It won't get better on it's own. Have the diagnostic trouble codes retrieved from the car's computer--any code that starts with 17 as in "1740" or codes that start with zero like "0730" are transmission codes and signs of impending failure. I know because my 2002 with 165,000 miles just failed.
Posted on Sep 16, 2009
SOURCE: fast idle astro van
Check the base plate gasket under the throttle body, some time the gasket start to leak, and will cause a high idle, if possible with engine running get some water and pore it at the base of the throttle bode, you will hear a suction sound, that's the gasket, replace it.
Posted on Jul 14, 2010
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