How to: Heel and Toe?

[E85]

first of all, yes i am a newbie to the Z4 ...

i noticed that i cannot heel and toe in this car

when you press on the brake, the throttle is disabled, anyway to fix this?

 

[tehdarkstar]

What car is yours? The throttle on my car remains operational when braking.

 

[E85]

2003 Z4 3.0

 

[inTgr8r]

^+1...
Never heard of that before, on any car.


....so if you left foot braked & still had your right foot on the gas;
it would go to idle?

If so, something is definitely wrong!

 

[E85]

i'll have to try that next

but for sure if you hit the brake first, the gas is disabled

 

[E85]

just tried it ... yes, i revved the car up to 3000 and then hit the brake and the car goes back to idle

my "service engine soon" light just came on yesterday, maybe has something to do with it??

 

[Yal]

IIRC the Service Engine Soon light usually has to do with emissions. Mine came on when my secondary air pump died for a second time in 6 months.

 

[AlanL]

????? My car does not exhibit this behavior at all when I use heel/toe down shifting.

I have seen Audis do what you describe and would notice it when I tried using a light brake pedal action while driving slowly (continuous throttle) to clean off my brake rotors after washing the car. This works fine on my Z4 and I see no evidence of a throttle cutout when the brake pedal is depressed.

 

[enfield]

I don't have this problem either.

 

[Color]

I don't have this problem either.

Ditto, been practicing heel & toe lately and it works like a charm.

 

[E85]

thx for the feedback, i'll bring it to a bmw mechanic to take a look later this week

kinda weird though, how they work perfectly when apart, but together, they don't

just got an emissions test last week and the car passed with flying colors, but again, the bimmer mechanic will let me know later this week

annoying that i can't heel and toe in the car!!!

 

[sp3ctre]

Seeing as the general consensus is this should not be the case it looks like a problem... gonna drop this in the problem section until we hear any different.

 

[E85]

ok thanks ... still puzzled by this, but hopefully bmw can find out why and fix it before my warranty runs out

 

[E85]

I have an update on my car. So during the last week, my "Service Engine Soon" (aka Check Engine Light) came on. Got the car scanned and it was the Mass Airflow Sensor. BMW replaced the part under warranty and EUREKA, I can heel and toe in the car now!!!

 

[E85]

given my posting above about how the problem got fixed, can anyone explain it?? how does getting a new mass airflow sensor fix the problem of the brake disabling the throttle??

something to do with the engine management?? how would it make sense that the car is trying to protect itself by not allowing the brake and throttle to function at the same time just because the mass airflow sensor isn't working properly??

 

[inTgr8r]

Hard to say....
I'd be willing to bet a tech wouldn't have the answer either.
...."something in the software"

 

[E85]

Hard to say....
I'd be willing to bet a tech wouldn't have the answer either.
...."something in the software"

yes, agreed, clearly it was software which is why i wasn't too concerned. independently, the brake and throttle worked fine, so it must have been software

i'm not 100% familiar with the inner workings of a car, but i'm no rookie either. is there any possible reason that the Mass Air Flow sensor would cause the original problem?? i'm thinking perhaps by throwing that code, the computer just went koo koo until a tech reset the obd2