Question about 1991 Chevrolet Lumina

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Car stalls when throttle is open - 1991 Chevrolet Lumina

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This sounds like engine timing is off, may have throttle position sensor in need of adjustment.

Good luck on both of these. You need a mechanic is all ...I'm not one, but mess around with my car some.

Posted on Oct 13, 2010

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Have a 2001 cavalier.... Starts fine now idles but when put into gear it stalls?


Possible torque converter clutch issue. Is the check engine light on? If so, have it scanned for transmission codes. If the torque converter clutch is locked up when it isn't supposed to be, the vehicle will stall. Another thing to check is for coking on the throttle plate. Remove the hose that goes from the air filter box to the throttle assembly and look inside the throttle bore to see if it is dirty/black. If so, use carb cleaner and a toothbrush to clean while holding throttle plate open and remove as much carbon deposits as possible. This can affect minimum idle airflow and also cause a stall

Jul 15, 2015 | Cars & Trucks

1 Answer

I'd like to get step to step instructions on how to clean the throttle body in my 2010 Jeep Patriot


  1. Purchase "02 Sensor Safe" throttle body cleaner spray;
  2. Drive the vehicle a few miles, bringing it to full operating temperature, then park it in your driveway with the engine still running;
  3. Gain access to the throttle body, and hold your thumb on the butterfly linkage so that you can open the throttle butterfly when the engine begins to load;
  4. Begin by spraying throttle body cleaner spray on all linkages around the throttle body. If the engine begins to bog because it is aspirating throttle body cleaner, quickly open the throttle butterfly to keep the engine running.
  5. Once you have cleaned all around the throttle body, spray cleaner DIRECTLY INTO THE THROTTLE BODY, opening the throttle sufficiently to keep the engine running. It will run rough during this process but try not to let the engine stall.
  6. If the engine stalls, restart it, and continue cleaning the throttle throat until you see clean metal.
  7. Pour some fuel system cleaner into the gas tank and drive the car a little more before parking it. Try to find an excuse to accelerate hard, WIDE OPEN THROTTLE momentarily if safely possible (as when accelerating to merge into traffic on a highway).
  8. Drive back home.
  9. Done.

Jul 19, 2014 | Jeep Patriot Cars & Trucks

1 Answer

Cle stalls when going to reverse to forward trailblazer 07 throttle body


I would check the idle control solenoid first. it is mounted near the throttle body or on it. When engine rpm drops it pushes the throttle open to keep it running. It also keeps idle up when switching on the
a/c and can be used as a quick check for the solenoid.

Feb 09, 2013 | 2007 Chevrolet Trailblazer

1 Answer

Reset obd on 2001 sequoia


The stalling is usually caused by carbon deposits in the throttle body, try remoioving the air intake tube from the throttle body, block the throttle plate open and use a small brush and some air intake/throttle body cleaner to clean the carbon out, do this with the battery negative cable off, reconnect everything and go drive it for about 15 minutes this usually restores the idle to normal.

Dec 11, 2012 | 2001 Toyota Sequoia

1 Answer

My 2003 3.0 lt trooper keeps stalling every few miles and ive all the sencors tested


You'll have to figure out if you are loosing fuel to the injectors or spark to the plugs to proceed. If it stalls when you come to a stop it could be a dirty throttle body or a faulty idle air control valve.
If you can hold the throttle open and keep it from stalling check the throttle body. If it stops like you turn the key off, you'll have to troubleshoot it like a no start condition.

Aug 22, 2012 | Cars & Trucks

1 Answer

2002 ford taurus stall when coming to a stop but start up quickly i have no check engine light that comes on what can it be


check the air filter if its plugged it could cause the stall,check the throttle plate for dirt as this will cause a stall.the throttle plate is located in the intake were the air snorkel fastens to the intake manifold.if you look inside the intake you will see a gold coloured plate this is the throttle plate.if you get a can of intake/throttle cleaner and a tooth brush you can spray the cleaner and gentle scrubbing the plate front and back while holding the throttle open and make sure you clean the area around where the sides of the plate sit when the throttle is closed.this is a common problem on all vehicles.

Oct 26, 2011 | 2002 Ford Taurus

2 Answers

1990 4Runner, 3.0 L engine, won't hold idle, wants to stall, no power. Replaced Mass air flow valve sensor, replaced fuel pump, distributor cap and rotor, plugs. It has good fuel flow but only runs well...


Have you looked at your idle air control valve What is it? This is an electrically driven valve that allows additional control over the throttle at idle Where is it located? The IAC is located on or adjacent to the throttle body and consists of a small device held on by two bolts with an electrical connector.
How does it work? When the throttle is closed the throttle plate closes off any air from the intake manifold. In order to stop the engine from stalling due to lack of air the IAC opens a small valve allowing air to pass from the air ducting to the intake manifold. Often the IAC components consist of an air inlet port in the inside wall of the throttle body, immediately in front of the throttle plate, with a similar exit port behind the throttle plate. Connecting the two ports is a motor driven valve. When the valve is opened air effectively by-passes the closed throttle plate to maintain the engine at idle. The IAC also augments the throttle when additional power demands are put on the engine such as steering.


Symptoms of faulty IAC

  • Poor starting: If the IAC fails to open or the inlet/exit ports are clogged shut with carbon the engine may start and then promptly stall. The engine can be kept running by pressing the accelerator. However any additional demand on the engine such as power steering or putting the car into drive (automatic) will cause the engine to stumble badly and often stall.
  • Engine cut out: Even with the engine warmed when the vehicle is stationary such as at a red light the putting of the transmission into of 'drive' to pull away before the accelerator is pressed can cause the engine to stall. (Note this differs from the TPS fault which causes engine stall due to the accelerator being pressed too quickly)

How to check? Physically remove the IAC but keep the electrical connection to it. Temporarily block off the now open ports on the throttle, turn the engine on and examine the IAC valve action in response to additional loads (power steering inputs etc). The valve should open and close according to demand.

How to fix? If the motor of the IAC has failed then replace the IAC. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IAC look blocked again clean them out thoroughly.

Jun 03, 2010 | 1990 Toyota 4Runner

1 Answer

2006 Envoy stalling when idels and won't stay running


Clean your Throttle body and pay attention to the Idle Air Control (IAC) valve passageway to try to clean the IAC. A dirty or faulty IAC will cause your engine to stall at idle, the job of the IAC is to open the passage way through the throttle body to regulate the amount of air to enter the engine to keep it from stalling when the Envoy is at idle.

Start with the simple and clean the throttle body and inspect any loose or damaged wire leads to the throttle body. Replace or repair any signs of damage.

Thank you for using Fixya and good luck.

Apr 10, 2010 | 2006 GMC Envoy Xl

2 Answers

Stalls at idle no fluxuation in voltage at iac


It is most likely the EGR (Exhaust Gas Recirculation) valve.
The valve is supposed to close when the car is idling and open other wise.

Inspect it / Replace it.

Hope this helps!

Sep 17, 2009 | 2003 GMC Sierra

1 Answer

Have a 01 Tahoe, fuel pump, fuel filter, fuel pressure regulator, TPS and CPS all have been replaced in the pass year. car still stalls at idle, when slowing down or low speeds. If I hold gas pedal to...


Pull the rubber inlet hose off at the throttle body and check for carbon build up around edge of throttle plate.USE a old toothbrush and some spray throttle body cleaner that can be purchased at autozone or othertype of parts house. Hold plate open spray and scrub with brush front,back and edges also make sure the idle air bleed hole on plate is open.

Aug 09, 2009 | 2001 Chevrolet Tahoe

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