Engine hesitation

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Engine hesitation

Post by Bodyboarder » 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
Last edited by Bodyboarder on Thu Jul 19, 2018 8:53 pm, edited 1 time in total.

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Engine hesitation

Post by Bodyboarder » Thu Jul 19, 2018 6:14 pm

This is happening once warmed up for reference

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Engine hesitation

Post by Bodyboarder » Thu Jul 19, 2018 6:48 pm

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

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Engine hesitation

Post by Spaniarduk » Thu Jul 19, 2018 8:34 pm

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.

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Engine hesitation

Post by Bodyboarder » Thu Jul 19, 2018 8:45 pm

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

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Engine hesitation

Post by mmm-five » 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 :headbang:
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Engine hesitation

Post by Bodyboarder » Fri Jul 20, 2018 8:09 am

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 :headbang:
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 .

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Engine hesitation

Post by dannytheduck1985 » Sat Jul 21, 2018 12:15 am

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.
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Engine hesitation

Post by Bodyboarder » Sat Jul 21, 2018 8:49 am

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?

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Engine hesitation

Post by 620turbo » Sat Aug 11, 2018 10:47 pm

Is it similar to this?

viewtopic.php?f=9&t=39891

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Engine hesitation

Post by tom21 » Sat Aug 11, 2018 11:21 pm

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?
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Engine hesitation

Post by ph001 » Sun Aug 12, 2018 8:08 am

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

Post by Yeddheng » Mon Aug 13, 2018 12:32 pm

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

Almost like this:
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Engine hesitation

Post by crustyclown777 » Tue Aug 14, 2018 9:38 pm

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

Post by Bodyboarder » Tue Aug 14, 2018 9:53 pm

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

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 :thumbsup:

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

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