Question about Oldsmobile Alero

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My alero idles fast

The 2003 alero goes down the rode 50 mph without stepping on throttle

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  • Oldsmobile Master
  • 21,873 Answers

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

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  • 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

  • 15 Answers

SOURCE: Idle fluctuates fast then slow. Knocks at 30-40 mph. gas mileage down

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

  • 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

  • 496 Answers

SOURCE: 2003 odyssey studders @ 50 -55 mph seems to

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

BCAS1298
  • 3092 Answers

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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I changed the battery in my 1998 F150 it was running fine now it doesn't run good it acts like it doesn't want to shift and it bogs down there's no codes in the light's not on?


You can try a drive cycle, see if it helps? There may be an idle relearn, if just idle issue? Usually it will relearn idle on its own by driving.
Drive Cycle Recommendations:
  1. Most OBDII monitors will complete more readily using a "steady foot" driving style during cruise or acceleration modes. Operating the throttle in a "smooth" fashion will minimize the time required for monitor completion.
  2. Fuel tank level should be between 1/2 and 3/4 fill with 3/4 fill being the most desirable.
  3. The Evaporative Monitor can only operate during the first 30 minutes of engine operation. When executing the procedure for this monitor, stay in part throttle mode and drive in a smooth fashion to minimize "fuel slosh".
WARNING
STRICT OBSERVANCE OF POSTED SPEED LIMITS AND ATTENTION TO DRIVING CONDITIONS ARE MANDATORY WHEN PROCEEDING THROUGH THE FOLLOWING DRIVE CYCLES.

For best results, follow each of the following steps as accurately as possible:
OBDII Monitor
Exercised
Drive Cycle Procedure
Purpose of
Drive Cycle Procedure
Drive Cycle
Preparation 1. Install scan tool. Turn key on with the engine off. Cycle key off, then on. Select appropriate Vehicle & Engine qualifier. Clear all DTC's/ Perform a PCM Reset. Bypasses engine soak timer. Resets OBDII Monitor status. 2. Begin to monitor the following PIDs: ECT, EVAPDC, FLI (if available) and TP MODE.
Start vehicle WITHOUT returning to Key Off. 3. Idle vehicle for 15 seconds. Drive at 64 Km/h (40 MPH) until ECT is at least 76.7°C (170° F). Prep for Monitor Entry 4. Is IAT within 4.4 to 37.8°C (40 to 100° F)? If Not, complete the following steps but, note that step 14 will be required to "bypass " the Evap monitor and clear the P1000. Engine warm-up and provide IAT input to the PCM. HEGO 5. Cruise at 64 Km/h (40 MPH) for up to 4 minutes. Executes the HEGO monitor. EVAP 6. Cruise at 72 to 104 Km/h (45 to 65 MPH) for 10 minutes (avoid sharp turns and hills) Note, to initiate the monitor: TP MODE should =PT, EVAPDC must be >75%, and FLI must be between 15 and 85% Executes the EVAP Monitor (If IAT is within 4.4 to 37.8° (40 to 100°F)) Catalyst 7. Drive in stop and go traffic conditions. Include five different constant cruise speeds, ranging from 40 to 72 Km/h (25 to 45 MPH) over a 10 minute period. Executes the Catalyst Monitor. EGR 8. From a stop, accelerate to 72 Km/h (45 MPH) at 1/2 to 3/4 throttle. Repeat 3 times. Executes the EGR Monitor. SEC AIR/CCM (Engine) 9. Bring the vehicle to a stop. Idle with transmission in drive (neutral for M/T) for 2 minutes. Executes the ISC portion of the CCM. CCM (Trans) 10. For M/T, accelerate from 0 to 80 Km/h (o to 50 MPH), continue to step 11. For A/T, from a stop and in overdrive, moderately accelerate to 80 Km/h (50 MPH) and cruise for at least 15 seconds. Stop vehicle and repeat without overdrive to 64 Km/h (40 MPH) cruising for at least 30 seconds. While at 64 Km/h (40 MPH) , activate overdrive and accelerate to 80 Km/h (50 MPH) and cruise for at least 15 seconds. Stop for at least 20 seconds and repeat step 10 five times. Executes the transmission portion of the CCM. Misfire & Fuel Monitors 11. From a stop, accelerate to 104 Km/h (65 MPH). Decelerate at closed throttle until 64 Km/h (40 MPH) (no brakes). Repeat this 3 times. Allows learning for the misfire monitor. Readiness Check 12. Access the ON-Board System Readiness (OBDII monitor status) function on the scan tool. Determine whether all non-continuous monitors have completed. If not, go to step 13. Determines if any monitor has not completed. Pending Code Check and Evap Monitor "Bypass" Check 13. With the scan tool, check for pending codes. Conduct normal repair procedures for any pending code concern. Otherwise, rerun any incomplete monitor.
Note: if the EVAP monitor is not complete AND IAT was out of the 4.4 to 37.8° C (40 to 100° F) temperature range in step #4, or the altitude is over 2438 m. (8000 ft.), the Evap "bypass" procedure must be followed.Proceed to step 14. Determines if a pending code is preventing the clearing of P1000. Evap Monitor "Bypass" 14. Park vehicle for a minimum of 8 hours. Repeat steps 2 through 12. DO NOT REPEAT STEP 1. Allow the "bypass" counter to increment to two.
© Ford Motor Company

Jun 18, 2017 | Ford F-150 Cars & Trucks

1 Answer

What is the drive cycle for a 2003 Nissan Sentra SE?


Take extra caution while performing dirve cycles on public roadways. Drive cycles can be difficult to follow under normal driving conditions. Begin by: - Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on. - Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. - Hold at a steady speed of 55 mph for three minutes. - Decelerate (coast down) to 20 mph without braking or depressing the clutch. - Accelerate back to 55 to 60 mph at ¾ throttle. - Hold at a steady speed of 55 to 60 mph for five minutes. - Decelerate (coast down) to a stop without braking. If all other emissions systems are functioning properly, completing the drive cycle above will set the "readiness flags" required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog test.

Oct 06, 2016 | 2003 Nissan Sentra

1 Answer

I have a 1998 dodge dakota with 290,000 miles it. AutoZone ran a check on it with no codes coming up. It idles high and goes about 50 mph without touching the gas in 5th gear. What is your opinion?


My first guess would be a sticky throttle plate or a major vac leak.
But there should be trouble codes if it won't idle at a normal speed.

Oct 12, 2015 | Dodge Cars & Trucks

1 Answer

2003 IMPALA IDLES AS FAST AS 55 MPH, HAVE REPLACE TPS, MAP SENSOR, IAC MOTOR AND CLEANED THROTTLE BODY, PROBLEM IS INTERMITTENT


To me it sounds like the (fuel pressure valve) located on the end of the fuel rail, by the throttle body, also check vacuum line.

Feb 22, 2011 | 2003 Chevrolet Impala

1 Answer

2003 ALERO IDLING TOO HIGH"


throttle position sensor

Feb 07, 2011 | 2003 Oldsmobile Alero

2 Answers

Engine idle speed wont come down under 1700rpm.i have fitted a new speed controller but same problem exists


You are probably having an issue with your IACV idle air control valve located on your throttle body. When the IACV goes out you lose control of your idle. The car may not idle at all or you could find yourself driving down the road at 50 MPH without touching the gas pedal.

Dec 29, 2010 | Mitsubishi Pickup Cars & Trucks

1 Answer

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.

Jul 14, 2010 | 1995 Chevrolet Astro

1 Answer

Idol runs fast after starting vehiicle


the idle air control valve is stuck,or there is a vacuum leak.check the vacuum lines,the throttle cable is not sticking and the idle control valve which is on the side of the throttle body and the throttle position sensor.check all the plugs on these for a good connection.

Jul 13, 2009 | 2003 Chevrolet Venture Passanger

3 Answers

2000 oldsmobile alero fast idle


I'm not sure if you've found the answer to your question yet...but i'm having a simlar problem with my car it could possibly be the Throttle Position Sensor. Simple explanation from what I understand it tells the engine how much your pushing on the gas pedal and if this peice is off it can send misreading to the engine causing high idle. I replaced it in my car and it works fine now. Park was $30~ at Auto Zone.

Jun 23, 2009 | 2000 Oldsmobile Alero

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