Question about 2005 Buick LeSabre

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2005 buick lesabre has a vibration at idle (idles at 600 rpm).

The IAC valve has been replaced and all three engine/transmission mounts have been replaced by Buick dealerships. Current mileage is 66,000....problem started at about 50,000 miles. The vehicle runs good and the fuel mileage has not changed.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 321 Answers

SOURCE: buick lesabre nightmare

Need to get a scan tool and look at the data stream while it is running for alot more info.Also any trouble codes.Sounds like initially,the engine isn't getting any fuel.I would have a pressure gauge connected to the fuel rail on the engine,so i could monitor the fuel pressure while all this is going on.Items to look at on the data stream would be timing,what timing is the PCM commanding for the engine.Also,have you checked for continuos power feed to the coils during this no start condition,and fire at the plugs while cranking.You could possibly still have spark,but maybe it is extremely weak?I have seen bad ignition switches cause weird problems before too.Many things power up through the ignition switch,just a thought.Have also seen bad PCM's cause strange problems..38 volts is a little on the low side for GM.Usually see those at,at least .50 and up,and rise steadily while pressing the throttle,up to just under 5.0 volts.Potentiometer with 5 volt supply.Vacuum leak can be checked with engine running at a steady idle speed,spray brake cleaner all around the intake manifold and listen for engine speed change.

Posted on Jul 31, 2008

  • 255 Answers

SOURCE: buick lesabre no start

Hi you have replaced allmost everything ,(try fuel pump relay)

Posted on Aug 18, 2008

fastboyz
  • 674 Answers

SOURCE: rough idle

fuel filters rarley cause idle problems. i would look at the egr valve or possible vaccume leaks.

Posted on Aug 24, 2008

  • 19 Answers

SOURCE: 1997 buick lasabre custom high idle, transmission, stalling

had same problem i would check the Idel Air Valve and also check all of your vaccum hose lines makeing sure there are no cracks or splits in rubber connectors if there is repair immediatelt because over time they start to dammage the internal parts fo the engine and if youve replace tps mass air etc. sounds like a vaccum hose problem

Posted on Feb 10, 2009

  • 105 Answers

SOURCE: 2000 LeSabre starts but runs very rough and stalls. After

My 2002 Lesabre (app 115000 miles) started something like this. Also the loose gas cap had been coming on for quite a while. I replaced the vacuum line from the air intake to the fuel sensor. It is under the engine cover (twist off the oil filler to remove the cover). There are two hoses together that come of the air intake. The small one goes to the top of the engine. The other goes across the front and makes a 180 turn back to the sensor. Chances are the 180 piece is cracked. It all comes from the dealer as one unit. $25
Seems to have fixed my problems. So if your car is running a little rough. Shutters under load. If the gas cap loose is coming on or probably a number of symptoms this might be the answer. I would replace this item. A cheap try.

Posted on Mar 12, 2010

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Why does my 2004 buick rendezvous idle at 3000 rpm and put in gear it drops to 1500 rpm and shifts hard while driving due to high engine speed?


Stuck throttle plate . gummed up with varnish or a problem with IAC valve . IAC - idle air control valve ! Videos on youtube , how they work how to clean . Idle Air Control Valve Could have unmetered air entering the engine pass the MAF sensor , a bad MAP sensor ! I would check the throttle plate first , if dirty clean it . Then check IAC valve if not the throttle plate . GM Idle Air Control IAC Function Diagnostics and Repair

Dec 14, 2016 | Buick Cars & Trucks

1 Answer

91 buick lesabre chugging at idle and accelerating smooths out at speed


It can be issue with IAC( idle air control valve) causing the problem.


There are many other possibilities causing these idle issues. Engine idles rough.

There are few help links with solutions to troubleshoot such idle issues.

I suggest you refer the link below and follow its troubleshooting details:------

Click the link below:-----

Ford Expedition IAC valve replacing

http://technoanswers.blogspot.com/2012/12/ford-expedition-iac-valve-replacing.html

Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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Stumbling and stalling at idle after engine rebuild?

http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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1999 Ford F-150 Idles rough and quits when gas pedal is pressed less?

http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Cold start problem and vehicle shudder around 2500 to 3500 rpms

http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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GMC Sonoma Stalls and idles low

http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html

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GMC Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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1996 Camry intermittent engine failure while idle?

http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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High Idle Problem

http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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High rpm in neutral? Inconsistant high RPM in neutral?

http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html

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Vehicle stumbling at idle and shows code 54?

http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html

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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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These details will help.

Thanks.

Feb 04, 2013 | Buick LeSabre Cars & Trucks

1 Answer

Just bought a toyota passo but when idling the engine vibrates too much and shakes the car


pls check your system by using a car scanner........ then monitor your IAC valve duty ratio up when shift to D position after it's OK clean throttle body and IAC valve.good luck

Nov 15, 2012 | Cars & Trucks

1 Answer

Idle control valve


The best way to replace the idle air control is to remove the the whole throttle body housing, You may want to remove the IAC valve and clean it internally with carburotor cleaner or even brake cleaner.2_23_2012_7_07_37_am.gif2_23_2012_7_08_18_am.gifThe engine ECM uses the IAC to maintain the RPM at 700+- 50 RPM

Feb 23, 2012 | 2005 Dodge Stratus

1 Answer

High --1600 rpm ?? rpm idle


The normal idle speed is below 1,000 rpm...between 800 to 900 rpm. I suspect that the idle-air control motor has seized and can no longer automatically adjust the engine's idle speed. This part is also responsible for slightly increasing idle speed when the airconditioning is switched on to compensate for the added engine load. Some cars even have a "step-up" solenoid to increase idle.

When replacing the idle-air control motor, remember to clean the port that IAC motor goes into; there will be some carbon build-up that may prevent the part's cone-shaped valve from seating properly. A can of intake valve spray helped along with some Q-tips works well.



Hope this helped.

Have a great day !!!

Apr 07, 2011 | 1992 Buick LeSabre

2 Answers

My idle drops everytime i come to a complete stop and even when i put it into reverse and also sometimes the car shuts down...


Idle Air Control (IAC) Valve OPERATION The ECM is programmed with specific engine speed values to respond to different engine conditions (coolant temperature, air conditioner on/off, etc.). Sensors transmit signals to the ECM which controls the flow of air through the bypass of the throttle valve and adjusts the idle speed to the specified value. Some vehicles use an Idle Speed Control (ISC) valve while others use an Air Valve (AV) or Idle Air Control (IAC) valve to control throttle body by-pass air flow. TESTING 2S-ELC Engine
  1. With the engine running and the coolant temperature below 140°F (60°C), pinch off the Air Valve hose and verify that the idle is reduced by no more than a 100 rpm.
  2. Unplug the valve wire connector and measure the coil resistance with an ohmmeter. It should be 40-60 ohms with the coolant temperature at 176°F (80°C) and the air valve closed.
  3. If not as specified, replace the valve. 3S-FE and 5S-FE Engines NOTE: The idle speed must be set correctly before testing the ISC valve.
  4. Bring the engine to normal operating temperature with transmission in N.
  5. Using a jumper wire, connect the terminals TE1 and El of the check connector (DLC 1). Fig. 1: Attach a jumper wire to the terminals TE1 and E1 in the DLC 1 89554g46.gif

  6. The engine rpm should rise to 900-1300 rpms for 5 seconds. Check that it returns to idle speed. If rpm is as specified, the valve is functioning properly.
  7. If rpm did not function as specified, stop the engine and disconnect the jumper wire.
  8. Disengauge the ISC valve connector.
  9. Using an ohmmeter, measure the resistance between the +B terminal (middle terminal) and the ISC1 - ISC2 (3S-FE) and the ISCC - ISCO (5S-FE) outer terminals. Fig. 2: Attach an ohmmeter and measure the resistance between the three terminals - 3S-FE engine 89554g49.gif
    Fig. 3: Attach an ohmmeter and measure the resistance between the three terminals - 5S-FE engine 89554g47.gif

  10. The resistance should be 16-17 ohms on the 3S-FE engine and 19.3-22.3 ohms on the 5S-FE engine.
  11. If not as specified, replace the ISC valve.
1MZ-FE Engine NOTE: The idle speed must be set correctly before testing the valve. Make sure the A/C is off during testing. Fig. 4: The IAC valve is attached to the lower portion of the throttle body 89554p46.jpg
  1. Bring the engine to normal operating temperature with transmission in N.
  2. Using a jumper wire, connect the terminals TE1 and El of the check connector (DLC 1).
  3. The engine rpm should rise to 1000 rpms for 5 seconds. Check that it returns to idle speed. If rpm is as specified, the valve is functioning properly.
  4. If rpm did not function as specified, stop the engine and disconnect the jumper wire.
  5. Disengage the ISC valve connector.
  6. Using an ohmmeter, measure the resistance between the +B terminal (middle terminal) and the RSC and RSO outer terminals. Fig. 5: Attach an ohmmeter and measure the resistance between the three terminals - 1MZ-FE engine 89554g48.gif

  7. The resistance should be 21-28.5 ohms on a hot engine.
  8. If not as specified, replace the ISC valve.
2VZ-FE and 3VZ-FE Engines
  1. Disengage the ISC valve connector.
  2. Using an ohmmeter, measure the resistance between the B1 terminal (lower middle terminal) and the S1 or S3 (lower outer terminals), and between B2 terminal (upper middle terminal) and the S2 or S4 (upper outer terminals). Fig. 6: ISC terminal identification - 2VZ-FE and 3VZ-FE engines 89554g50.gif

  3. If the resistance is not 10-30 ohms, replace the ISC valve.
  4. Apply battery voltage to terminals B1 and B2 while repeatedly grounding S1, S2, S3, S4, S1 in sequence. Check that valve moves toward the closed position. Fig. 7: Testing the IAC using battery voltage to see if the valve will close-2VZ-FE and 3VZ-FE engines 89554g51.gif

  5. Apply battery voltage to terminals B1 and B2 while repeatedly Grounding S4, S3, S2, S1, S4 in sequence. Check that valve moves toward the opened position. Fig. 8: Testing the IAC using battery voltage to open the valve - 2VZ-FE and 3VZ-FE engines 89554g52.gif

  6. If valve does not function as specified, replace the ISC valve.
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Oct 12, 2010 | 1995 Toyota Camry

2 Answers

RPM problem


Check and lube the Idle Air Control (IAC) valve,

This tiny electric motor is mount on top valve cover and close to the accelerator cable.

The function of IAC motor is to idle up the RPM when more load is added.

Example: A/C on,light on,stop light on and radio on.

A stuck IAC can be free by few soft tape on the body of the motor.

To lube the worm gear,you will need WD-40 to free up the old grease and lube white lithium grease.

Clean the electrical contacts with CRC electric part cleaner.

This electric motor is very expensive.

Please handle it with care.

Dec 08, 2009 | 1998 Suzuki Esteem

1 Answer

Low idle and stall


check your idle air control valve(IAC) its probably dirty and are not able to move freely
the IAC valve controls the air mixture at idol speeds

May 17, 2009 | 1999 Buick LeSabre

2 Answers

Car vibrates at idle.


you may have a pulley out of balance. ie harmonic balancer, steering pump, alternator. try increasing idle, set it at 850-900.

Oct 28, 2008 | 1992 Honda Accord

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