BMW 1-Series Forum (F20) 135i - > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > M135i problem
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      09-11-2019, 07:03 AM   #1

Drives: M135i
Join Date: Aug 2019
Location: Uk

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M135i problem

So I posted the other week thinking I may have a gearbox problem.

I have now had codes read and I have airflow low and high.

I have changed the MAF and not resolved. Plugs were done 5 months ago. No codes coming up regarding misfire so hopefully ruling out coils or plugs. Itís also a 2014 model so thought the issues with the hpfp had been sorted.

Problem is now getting worse.

One day basically went to put my foot down it kicked down but then no power.

I now have hunting revs intermittently at a stand still. On gear change at low speeds it jerks a little kinda bumps the revs up so you lurch forward. And absolutely has no top end grunt at all. It seems normalish when pulling out of a junction if you havenít been stopped for long.

Any pointers would be great, mechanic mates had a look on the drive and doesnít think there is a air leak what he can hear but it is booked in to check.
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      10-05-2019, 02:43 PM   #2
Second Lieutenant
United Kingdom

Drives: F20 M135i
Join Date: Jan 2013
Location: Surrey

iTrader: (0)

Did you check the charge pipe...?
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