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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Engine hiccups in 1st and in reverse (N43 320i e92)



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      08-14-2017, 04:53 AM   #1
Bogdan_TB
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Engine hiccups in 1st and in reverse (N43 320i e92)

Hi all,

To explain the issue (bought the car 1 month ago):

The car has 88k km(real ones) was driven only on occasion and short distances).
Changed the spark plug & coils (one of the spark plugs was dead -- the head of it was full of oxide and the coil was penetrated --, now all of them are working fine, NKG ones are in).

The car is accelerating ok (coming from a diesel e46 320d), but when I don't rev it more than 1500rpms I have a power drop (around 500RPMs) when putting it into gear (manual transmission) + those hiccups (annoying as hell) the same happens for the reverse.
The idle is around 800RPMs (with climate control on) and around 700 without it. (this after 1min when a cold start is done)
In inpa I see the RPMs fluctuating between 720 - 690 (not steady after 1min)
The hiccups are more dramatically on a cold start.

I have read all the errors using INPA (pointing to the Nox Sensor):

A6CF (climate control related -- if I'm not mistaken)
30EA
2AF4
2AF2
2AF6

Any ideas what it could be, or is there more information needed ?
I'm planning of changing the oil as well (every 10k for this one, as this engine is pretty demanding, Liqui Moly 5w-30)

Cheers,
A desperate bmw driver
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      08-15-2017, 03:46 AM   #2
Bogdan_TB
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Figured some of the issue, cleaned the VANOS system, following this tutorial:



The car is running much smoother now, I will check the MAF as well.

If the problem isn't 100% fixed I will change the VANOS on my next oil change as well.

Cheers!
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      08-15-2017, 10:12 AM   #3
Sumptuous Hummus
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Quote:
Originally Posted by Bogdan_TB View Post
Figured some of the issue, cleaned the VANOS system, following this tutorial:



The car is running much smoother now, I will check the MAF as well.

If the problem isn't 100% fixed I will change the VANOS on my next oil change as well.

Cheers!
It seems like something air/intake related like MAF.
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      09-06-2017, 09:39 AM   #4
Bogdan_TB
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Seems the issue is back. To explain more ... it's the same as in this video, it's hard to see it but the whole car is juddering, RPMs drop and you feel the movement of it. This is all in the 1st and R gears.



Any ideas?
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