Stalls

[leonc17]

Coming off motorways and approaching roundabouts or junctions. Breaking from high speeds car stalls revs just carry on dropping. Car then stalls. Can anyone help describe what the problem may be please? Thanks

[kenmac]

Sounds like your throttle body needs cleaning,seems to be a common problem on LS's

[leonc17]

thank you for your response. Could i trouble you to describe exactly what a throttle body is and how I would go about cleaning it.

Many thanks,

Leon

[kenmac]

Cleaning Throttle body

Hope this explains it OK

In a fuel injection engine, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver input.

The throttle body is usually located between the air filter box and the intake manifold, and usually attached to, or near, the mass airflow sensor.

The largest piece inside the throttle body is the throttle plate, which is a butterfly valve that regulates the airflow.

When the driver presses on the accelerator pedal, the throttle plate opens up, allowing more air into the intake manifold. Either a throttle position sensor or an airflow sensor measures this change and communicates with the ECU. The ECU then increases the amount of fuel being sent to the fuel injectors in order to maintain the desired air-fuel ratio.

Throttle bodies may also contain valves and adjustments to control the minimum airflow during idle.

[Haylands]

thank you for your response. Could i trouble you to describe exactly what a throttle body is and how I would go about cleaning it.

Many thanks,

Leon

Leon

See here for step by step guide to cleaning it

http://www.lexls.com/tutorials/EFI/throttlebody.html

Pete

[Mike_B]

Just a thought - cleaning the throttle body may well sort it out.

If not, check the pipes that feed vacuum to the brake servo. Under closed throttle and with heavy braking, there will be a very high vacuum in the manifold and any air leaks into there might potentially cause a weakened mixture and stall the engine?