Question about Buick LeSabre

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1997 buick lesabre idles high (about 2900-3000) when started stone cold. Lately, you have to feather the throttle pedal to make it stay running. Let it run for five minutes, shut it off, restart, and it idles fine (850-1000), but when driving it will intermittantly stall when letting off the throttle. Then once you drive it somewhere for five miles or so, if you shut the engine off, it won't restart until it cools completely down. Have replaced CRPS, TPS, and IAC module with not much difference. HELP! It's my son's car & he and I are both ready to burn it! Really, any helpful suggestions at this point are greatly appreciated! Thanks much! Denis

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  • Buick Master
  • 1,043 Answers

Check the electronic temp control by the thermostat outlet, it looks like a water temp sw. , but it sends a signal to the computer to tell it what the temp outside is and add fuel to the engine based on temp. If it is bad it messes up the idle.

Posted on May 27, 2017

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1997 dodge ram 1500 stalls when driving

check vacuum hose into throttle body, also clean throttle body orifices and iac. remove iac [engine off] and have someone turn key to on to see if plu8nger works. just a thought .

Posted on Dec 25, 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

SOURCE: Car stalls when you let off the gas when warm or idling

sounds like your IAC (idle air control valve) located on the throttle body towards the front of the engine held in by 2 torx screws. the iac controls the idle if the car when your not on the gas. i will post the steps to clean the iac and the passages that the iac goes into.

1. disconnect the iac connector
2. remove the iac
3 clean the iac pintle valve and check for wear
4. clean the passages that the pintle valve sits in (usually carbon build-up in there, you may need to remove the air intake tube and air filter box to get to the passages in the throttlebody)
5. if the iac looks ok and the passages are cleaned re-install and put everything back
6. start car and see if it idles like normal when warmed up. you may need to give it a few tries for the iac to re-learn its proper position so give it a few warmup cycles
7. if it still stalls check for proper operation of the iac via ohming out the connectors (if you look it up on google you will find the specs at which the iac is supposed to operate)
8. if the iac is working properly, check for vacuum leaks on the intake manifold and vacuum lines.
9. if no vacuum leaks are present and the iac id working properly after cleaning have a shop check the ecm (engine control module) for a bad circuit board, i've seen that haoppen as well

hope this helps!

Posted on Feb 17, 2009

  • 10 Answers

SOURCE: Car stalls when you let off the gas when warm or idling

Don't let off the gas!

Posted on May 02, 2009

  • 2187 Answers

SOURCE: IDLING PROBLEMS ON 1992 ACCORD EX

Have the Idle Control Solenoid Valve cleaned up.

Or it might be defective. See steps below to check...

  1. Disconnect idle control solenoid valve electrical connector.
  2. Disconnect upper hose to solenoid valve from manifold and apply vacuum to hose. Valve should hold vacuum.
  3. Continue applying vacuum to hose and briefly energize valve by connecting battery positive terminal to the black/yellow wire terminal and negative battery terminal to the green/black wire terminal. Valve should not hold vacuum when energized.
  4. If idle control solenoid valve fails to perform as outlined, valve is defective.

Posted on Jun 03, 2009

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It sounds like you have a vacuum leak or intake gaskets leaking. Try this. Start the engine and let it reach the idle it want to go to. Get you a can of Brake Clean and spray it around the intake manifold (it on the top center of the engine, you may have to removed a plastic cover) If the engine idle changes up or down then the intake gaskets are leaking hence your vacuum leak. I hope this will help you.

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