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Engine hesitation
Posted: Thu Jul 19, 2018 6:14 pm
by 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
Engine hesitation
Posted: Thu Jul 19, 2018 6:14 pm
by Bodyboarder
This is happening once warmed up for reference
Engine hesitation
Posted: Thu Jul 19, 2018 6:48 pm
by Bodyboarder
Bodyboarder wrote: ↑Thu Jul 19, 2018 6:14 pm
This is happening once warmed up for reference
And also has a k&n drop in filter
Engine hesitation
Posted: Thu Jul 19, 2018 8:34 pm
by 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.
Engine hesitation
Posted: Thu Jul 19, 2018 8:45 pm
by Bodyboarder
Worth a shot .... although I have just bought a gruppeM for it
For the sake of £10 I might just put a standard one in and see if it helps or not
Engine hesitation
Posted: Thu Jul 19, 2018 10:12 pm
by 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
Engine hesitation
Posted: Fri Jul 20, 2018 8:09 am
by Bodyboarder
mmm-five wrote: ↑Thu Jul 19, 2018 10:12 pm
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 .
Engine hesitation
Posted: Sat Jul 21, 2018 12:15 am
by dannytheduck1985
Bodyboarder wrote: ↑Thu Jul 19, 2018 6:14 pm
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.
Engine hesitation
Posted: Sat Jul 21, 2018 8:49 am
by 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?
Engine hesitation
Posted: Sat Aug 11, 2018 10:47 pm
by 620turbo
Engine hesitation
Posted: Sat Aug 11, 2018 11:21 pm
by 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?
Engine hesitation
Posted: Sun Aug 12, 2018 8:08 am
by ph001
Sounds electrical to me. Coil packs is where I would start.
Engine hesitation
Posted: Mon Aug 13, 2018 12:32 pm
by Yeddheng
Does it feel like a vague bounce at a rate of 3-4 bounce per second?
Almost like this:
Engine hesitation
Posted: Tue Aug 14, 2018 9:38 pm
by crustyclown777
Try removing the MAF and running the car to see if the issue is gone.
Engine hesitation
Posted: Tue Aug 14, 2018 9:53 pm
by 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