Missing and backfire

[shane@mbtech]

went to the workshop this morning.

The mac is telling me that the intake flap is jamming.

The motor on the airbox is turning the flap to open and close but when its closes then it closes to much casuing it to stick.
He made mention that the shaft that holds the flat could be worn out causing it to stick.
He now suggests to remove the flap and sand it down slightly to arrow easy opening and closing.

btw, the computer is no longer showing any faults after changing the coil packs from Bremi to Bosch. told them to change all the plugs as well.

hope this works out...

On one cylinder or them all?

Are you talking about the throttle butterflies or the carbon airbox flap?

At what throttle load?

What revs?

Sport on/off?

[alexk]

its no longer the misfire. the misfire is sorted.

this is a lack of power at certain times and slight jerk.

Hm.
I am not sure you are following the advice of other people here, especially experienced ones. You are asking for opinions and then telling us something else.

Lack of power and being jerky are not really symptoms of a stuck flap.
In my opinion, finalize some things instead of going after new stuff.

Lawsy is asking you about the intake flap because the flap opens at different RPM when sport is on or off.
The BMW GT1 has a test for the flap, your dealer could play with this to actually see if the flap is getting stuck or not.
I haven't heard of a stuck flap that needs sanding down to run smoothly.

[AlexGTT]

:banghead: Get on the phone and instruct them to do a comp test asap.

[alexk]

:banghead: Get on the phone and instruct them to do a comp test asap.

I know where this is going to go !
In the end they will strip out the differential [ as it was another issue ]; they will be puzzled and final strike is going to be the compression test, where they will realize that the flap, microfilter, relay, fuel filter, wheel speed sensor and differential were all fine...
But the headgasket was gone :hahaha:

[hoshy]

Interesting thread... subscribing.

[Bones]

Its a cylinder bore leak down test you want to be doing first :wink:

[Mark CSL]

My CSL was prone to being flat out of junctions and jerky sometimes
after lots of there was no faults they changed the throttle position sensor its the one near the oil filter housing.
Its like a new car again :thumbs:

worth a try

[BADCSL]

My CSL was prone to being flat out of junctions and jerky sometimes
after lots of there was no faults they changed the throttle position sensor its the one near the oil filter housing.
Its like a new car again :thumbs:

worth a try

Mark- you the man..... u are correct.

We changed all 6 coil packs- 2 which was faulty and all the plugs which made the car run better but still had the jerk on certain times.

eventually we just cleaned out the flaP and housing and changed an air temperature sensor that fits on the inlet housing.

picked up the car today and it is running PERFECT.

Thanks for the advice guys.

THE END :supz:

[shane@mbtech]

Mark- you the man..... u are correct.

We changed all 6 coil packs- 2 which was faulty and all the plugs which made the car run better but still had the jerk on certain times.

eventually we just cleaned out the flaP and housing and changed an air temperature sensor that fits on the inlet housing.

picked up the car today and it is running PERFECT.

Thanks for the advice guys.

THE END :supz:

I had the air temp sensor doing that same thing. It was reading something like 40*c.



Glad its all sorted for you bud.

[alexk]

The throttle position sensor and air temp sensor are two very different things.

For the record, our car has 3 throttle position sensors.

[Mark CSL]

The throttle position sensor and air temp sensor are two very different things.

For the record, our car has 3 throttle position sensors.

Yes Alex it has 3 but its always the one on the front that goes the BMW Tec told me :thumbs:

[cantfind1]

Technically 4, as there is one in the accelerator pedal as well.......

[CraigMillwardCroft]

Technically 4, as there is one in the accelerator pedal as well.......

Would that be 5 if you count the foot pressing the pedal :whistle: