[sy2767]

Back in the old days of carburetors ( and some fuel injection) cars would become flooded (with gas) and would not start, one remedy would be to hold the accelerator pedal to the floor while cranking the engine to clear out the fuel. My question is would this procedure work on a 2006 and newer BMW? I don't think it would because of valvetronic and stated so on another car forum and was attacked because they say im wrong........ am i wrong? I know this might be the wrong forum for this but no one ever reads anything in the N/A engine section.... LOL

[mrbillytalent]

Our accelerators are fly by wire, there is no hard connection to how your fuel is injected. Your ECU does all the thinking for you. whether or not you've got the pedal pegged or not won't do anything until after the vehicle has been started.

[sy2767]

Originally Posted by mrbillytalent

Our accelerators are fly by wire, there is no hard connection to how your fuel is injected. Your ECU does all the thinking for you. whether or not you've got the pedal pegged or not won't do anything until after the vehicle has been started.

I know this, but some drive by wire cars will open the butterfly in the throttle body while the engine is cranking because of the signal it is receiving from the accelerator pedal sensor allowing air to enter the engine, they think BMW's operate on this theory but our cars don't use a conventional throttle body, valvetronic takes the place of the throttle body in allowing a metered amount of air to enter the engine. When we push on the accelerator pedal in our cars it actually controls the valvetrain and not the TB butterfly.

[Efthreeoh]

Originally Posted by sy2767

Back in the old days of carburetors ( and some fuel injection) cars would become flooded (with gas) and would not start, one remedy would be to hold the accelerator pedal to the floor while cranking the engine to clear out the fuel. My question is would this procedure work on a 2006 and newer BMW? I don't think it would because of valvetronic and stated so on another car forum and was attacked because they say im wrong........ am i wrong? I know this might be the wrong forum for this but no one ever reads anything in the N/A engine section.... LOL

You are 100% correct.

[sy2767]

Originally Posted by Efthreeoh

You are 100% correct.

Thank you...

[RequestTheOverhead]

Originally Posted by sy2767

I know this, but some drive by wire cars will open the butterfly in the throttle body while the engine is cranking because of the signal it is receiving from the accelerator pedal sensor allowing air to enter the engine, they think BMW's operate on this theory but our cars don't use a conventional throttle body, valvetronic takes the place of the throttle body in allowing a metered amount of air to enter the engine. When we push on the accelerator pedal in our cars it actually controls the valvetrain and not the TB butterfly.

I know this is true for the N52, but I don't know about the N54. I thought the N54's had more of a traditional TB the was drive-by-wire controlled. Could be wrong though.

[volkswackin]

on an n52 theres something called a clear flood mode which will do what you speak of...never really tried it on an n54 though.

[centexE9x]

You guys are thinking about it all wrong. The valvetronic motor is the throttle body(for all intensive purposes),the n52/k the throttle body is only for vacuum. It does not function as a traditional throttle body. To the OP's question if I get one that is all flooded out I hold it to the floor. Whether it really does anything. Idk but it does seem to clear them out faster.

[sy2767]

Originally Posted by centexE9x

You guys are thinking about it all wrong. The valvetronic motor is the throttle body for the n52/k the throttle body is only for vacuum. It does not function as a traditional throttle body. To the OP's question if I get one that is all flooded out I hold it to the floor. Whether it really does anything. Idk but it does seem to clear them out faster.

Pretty much says what i stated above, not to quote myself but...... quote" valvetronic takes the place of the throttle body in allowing a metered amount of air to enter the engine. When we push on the accelerator pedal in our cars it actually controls the valvetrain and not the TB butterfly."


i searched on the net and here and can't seem to find anything related to my question.

[centexE9x]

Originally Posted by sy2767

Pretty much says what i stated above, not to quote myself but...... quote" valvetronic takes the place of the throttle body in allowing a metered amount of air to enter the engine. When we push on the accelerator pedal in our cars it actually controls the valvetrain and not the TB butterfly."


i searched on the net and here and can't seem to find anything related to my question.

I hold em to the floor to clear them out. It doesn't happen too often on a n52/k. So I can't remember if it made a big diff off the top of my head. It's fuel injection, so if its flooding for any reason something is wrong.

[Ethanderall]

You cannot flood a carb engine simply by holding the throttle open and cranking the starter. Carb engine's only flood due to incorrect setting of the metering needle or by the buffon behind the wheel stomping up and down on the accelerator pedal, actuating the accelerator pump in the carb, causing excess fuel to be delivered.

As EFI systems do not have an accelerator pump as such, you can't flood the engine unless there's something radically wrong with it.

[07lilredwagon]

would it help to remove the air filter while attempting the start? Im sure your air filter is fine, but might be worth a check...and it may let just a little more air in...

Also, you never know what you will find when you remove a few things off the top of the motor and visually and physically check all injector, fuel, air, and vacuum hoses, connectors, ect....

JP

[Braumin]

Originally Posted by Ethanderall

You cannot flood a carb engine simply by holding the throttle open and cranking the starter. Carb engine's only flood due to incorrect setting of the metering needle or by the buffon behind the wheel stomping up and down on the accelerator pedal, actuating the accelerator pump in the carb, causing excess fuel to be delivered.

As EFI systems do not have an accelerator pump as such, you can't flood the engine unless there's something radically wrong with it.

Actually you can flood a EFI car especially in the cold. I assume it doesn't get very cold in AU. In fact my wife's Nissan flooded the other day when it was -32° C and her X-Trail was outside for a couple of days.

On an EFI car, holding the pedal all the way down tells the ECU to not run the injectors at all to help with a flooded engine.