Engine problem

[Klabbe]

Hello!

I have a Mini Cooper S -05 and I have change pulley 19%, colder spark plugs and change software. The engine is ok when it is cold but when it is full (90 degree) temperature the engine compensate, snatch little and the engine give not full power, have some one else have that problem? I hope you understand my not so good English.

// Klabbe

[Paul@1320]

what software do you have?? what belt did you usewhen you swopped the pulley??

[Klabbe]

It´s a Swedish software, ItsFun and they change the belt. pulley and the belt was in the same package.

[Klabbe]

Can the belt skid on the pulley? but why? when the engine is cold it´s works but not when the engine it´s hot ?

[Fisher]

Try with original software.

[Klabbe]

I wonder what the shut-off valve have for function

/ Klabbe

[Klabbe]

Quote: Originally Posted by Fisher (original)

Try with original software.

Hello!

We have now change the software to original and change the pulley to 0% but that is the same problem, when the engine I cold it is ok but when the temperature rise the engine compensate, snatch little and the engine give not full power.

I have change the air filter and the oil in the filter can broke down the sensor in the air quantity meter (I don’t now the English word for it but I Swedish we call it “luftmassemätare”) but when I look in BMW part catalog I cant fond it? What control the air temp or quantity on the Cooper S engine ?

// Klas

[DaFlake]

I think that the luftmassematare that you are referring is a map sensor in English. (rough translation with what I could find).

That being said, the symptoms that you describe seem like a super charger bypass valve gone or going bad.

Detroit Tuned // Detroit Tuned Bypass Valve

[Klabbe]

Quote: Originally Posted by DaFlake (original)

I think that the luftmassematare that you are referring is a map sensor in English. (rough translation with what I could find).

That being said, the symptoms that you describe seem like a super charger bypass valve gone or going bad.

Detroit Tuned // Detroit Tuned Bypass Valve

If the bypass valve is gone or going bad, why works the engine when it is cold?

[DaFlake]

It could be heat (causing metal to change) that is making it go bad. This is a pretty common MINI problem and loss of power is one of the signs.

[Klabbe]

Can I check the bypass valve or can I BMW dealer do that without to change the valve?

When I drive at 2000-4500rpm the engine look like to give full power but from
4500-6900rpm it compensate, snatch little and the engine give not full power but when the engine is cold it give full power from 2000-6900rpm.

Can a broken air sensor give this problem to?

[Klabbe]

Quote: Originally Posted by DaFlake (original)

It could be heat (causing metal to change) that is making it go bad. This is a pretty common MINI problem and loss of power is one of the signs.

Please, how can I check the bypass valve?

[DaFlake]

With you problem I don't know of a way to check it. It is probably better to just swap it out and see if that solves it or take it to a mechanic that has the ability to read the ECU to see if a code has been thrown.

[Klabbe]

Quote: Originally Posted by Klabbe (original)

Can I check the bypass valve or can I BMW dealer do that without to change the valve?

When I drive at 2000-4500rpm the engine look like to give full power but from
4500-6900rpm it compensate, snatch little and the engine give not full power but when the engine is cold it give full power from 2000-6900rpm.

Can a broken air sensor give this problem to?

I have now change the bypass valve but I have the same problem? can it be one of the air sensors? or what ? Please help me.

// Klas

[Klabbe]

Air sensor ?


Which one is the dubbel air sensor, temp and pressure, the one in the intake manifold
RealOEM.COM * BMW R53 Cooper S INTAKE MANIFOLD SYSTEM hg=11&fg=40
09 MANIFOLD AIR PRESSURE SENSOR 1 12140872679
or
RealOEM.COM * BMW R53 Cooper S WATERPUMP - THERMOSTAT hg=11&fg=35
12 MANIFOLD AIR PRESSURE SENSOR 1 12140872648


Quote: Originally Posted by Klabbe (original)Can I check the bypass valve or can I BMW dealer do that without to change the valve?

When I drive at 2000-4500rpm the engine look like to give full power but from
4500-6900rpm it compensate, snatch little and the engine give not full power but when the engine is cold it give full power from 2000-6900rpm.

Can a broken air sensor give this problem to?


I have now change the bypass valve but I have the same problem? can it be one of the air sensors? or what ? Please help me.

// Klas