Engine hesitation

[Bodyboarder]

Hi all ..... sorry hitting this M specific section pretty hard at the moment!!

On medium to hard throttle at around 1500-3000 rpm I’m getting a hesitation/jerk like issue , feels like you’ve come on and off the throttle really quick . What’s people thought and anyone else had the same issue?

The car has a maf/brake booster valve issue and the booster valve has been ordered . Could this be related also ? If it’s throwing the maf readings out could this cause the hesitation at all?

Other thoughts are throttle position sensors ....

Thanks

 

[Bodyboarder]

This is happening once warmed up for reference

 

[Bodyboarder]

This is happening once warmed up for reference

And also has a k&n drop in filter

 

[Spaniarduk]

I once read in a BMW technical paper that in case of light opening throttle hesitation on of the things to look out was cold air intake and high flow air filters. Perhaps worth a try with an oem paper filter.

 

[Bodyboarder]

Worth a shot .... although I have just bought a gruppeM for it :lol:

For the sake of £10 I might just put a standard one in and see if it helps or not

 

[mmm-five]

Any leaks in the intake boot (between the airbox and plenum)?

I had that about 60,000 miles ago, but thought it was a MAF issue, and replaced that first

 

[Bodyboarder]

Any leaks in the intake boot (between the airbox and plenum)?

I had that about 60,000 miles ago, but thought it was a MAF issue, and replaced that first

You saying that makes me think it could also be related to my maf/brake booster fault code . The brake booster valve /solenoid goes from the inlet elbow and if thats faulty could be letting not enough/too much air through and causing the maf fault /hesitation that I’m getting .

 

[dannytheduck1985]

Hi all ..... sorry hitting this M specific section pretty hard at the moment!!

On medium to hard throttle at around 1500-3000 rpm I’m getting a hesitation/jerk like issue , feels like you’ve come on and off the throttle really quick . What’s people thought and anyone else had the same issue?

The car has a maf/brake booster valve issue and the booster valve has been ordered . Could this be related also ? If it’s throwing the maf readings out could this cause the hesitation at all?

Other thoughts are throttle position sensors ....

Thanks

Get her scanned mate. Some issues don’t always throw up a dash warning light. Sounds like a miss fire to me.

 

[Bodyboarder]

seems to be happening when you’ve been out for a good blast and the engine is obviously running hotter than normal..... ?

Would a dodgy coilpack do this once it gets really hot?

 

[620turbo]

Is it similar to this?

https://z4-forum.com/forum/viewtopic.php?f=9&t=39891

 

[tom21]

I had a similar issue, fixed it by changing the Mass Airflow Sensor on the air intake. Are you able to scan the error codes?

 

[ph001]

Sounds electrical to me. Coil packs is where I would start.

 

[Yeddheng]

Does it feel like a vague bounce at a rate of 3-4 bounce per second?

Almost like this:

 

[crustyclown777]

Try removing the MAF and running the car to see if the issue is gone.

 

[Bodyboarder]

Changed the maf for a new one , new air filter ( was a k&n ) seems to have done the trick

Also bought a new throttle position sensor ... as I’m planning on removing the intake plenum, cleaning the icv and while it’s apart makes sense to change that to sensor underneath

Also one coil pack is not a Bosch one , so bought a bosch one to replace it with ... makes my ocd happy :lol:

 

[crustyclown777]

Glad that resolved it. I've just ordered a new MAF, as mine was showing similar symptoms as yours.

 

[Bodyboarder]

..... update

Thought the new maf had solved it , it came back

Had all the old coil packs ( previous owner put new ones in .. one was a different make ) ... swopped them all back to the old coilpacks . What a difference.... smoother ( quieter ? ) feels quicker and just so nice to drive ! Went for a proper blast and not one single hesitation. Happy to say the least !... as when it came back a little bit of my heart died

 

[Lower]

Reset the adaptions in the dme. That will make it go for a while.

 

[Bodyboarder]

Reset the adaptions in the dme. That will make it go for a while.

Yes my indie done that but made zero difference to be honest ... clearly a hardware issue , in my case a coil pack ... not worried though , as putting a new maf won’t do any harm and now I know I have a decent spare sat there !

 

[Simon 3.2M]

What is the DME?