[inthehat]

Hello All

same problem here 325i n52 2006 been living with it for a while now

car hesitates on acceleration and jerks when off the throttle unfortunately no error codes ever so garages say nothing wrong!!!

done so far

cleaned the solenoids and bench tested no improvement
replaced Vanos motor no improvement
revised Throttle Pedal and sensor from Newer model

I'm looking for more ideas before checking built in PCV valve. found you can buy the part rather than replace entre valve cover. Ebay 172189766625.
I get a puff of oil every now and then so wonder if related. anyone inspected theirs?

[ZeroSum]

Originally Posted by inthehat

Hello All

same problem here 325i n52 2006 been living with it for a while now

car hesitates on acceleration and jerks when off the throttle unfortunately no error codes ever so garages say nothing wrong!!!

done so far

cleaned the solenoids and bench tested no improvement
replaced Vanos motor no improvement

I'm looking for more ideas before checking built in PCV valve. found you can buy the part rather than replace entre valve cover. Ebay 172189766625.
I get a puff of oil every now and then so wonder if related. anyone inspected theirs?

This is what mine is doing

[alx.]

This is weird, i have a MAF code thrown even though the CEL doesn't pop.

The maf is brand new from an e-bay seller, came in a brand new box VDO siemens, what gives? I shouldn't get an error thrown with a new maf.

[Three_thirty_I]

Originally Posted by alx.

This is weird, i have a MAF code thrown even though the CEL doesn't pop.

The maf is brand new from an e-bay seller, came in a brand new box VDO siemens, what gives? I shouldn't get an error thrown with a new maf.

That is weird!! And you are using a normal paper air filter, not an oiled filter?

[tdavis42]

Originally Posted by alx.

This is weird, i have a MAF code thrown even though the CEL doesn't pop.

The maf is brand new from an e-bay seller, came in a brand new box VDO siemens, what gives? I shouldn't get an error thrown with a new maf.

Double check connections.

[alx.]

Originally Posted by Three_thirty_I

That is weird!! And you are using a normal paper air filter, not an oiled filter?

Normal, i messaged the guys who sold me the maf and they said i can send it back but they are sure it's in perfect working condition. It was new after all. They mentioned to check 02 sensors and throttle body position sensor? I was aware the n52 didn't have a throttle body position sensor.

Originally Posted by tdavis42

Double check connections.

Will do, i forgot to mention even though i am 99% sure it has nothing to with it my intake boot that goes into the air filter box is broken so it doesn't connect with the filter box very well, picture below:



Where he pries it out in the picture mine is torn so it doesn't connect well with it, could that lead to a vacuum leak?

[jan31]

Originally Posted by alx.

To update everyone on the parts changed to fix the issue:

Coils - slight improvement, jerk/shake still there
Plugs - no improvement
Injectors - Slightly better start-up, minor improvement
Solenoids - fixed errors, slightly better in regards to the shake but still present
MAF - fixed jerks, misses in acceleration and shifting.

Overall i am happy the car is a beast again, thanks to everyone who contributed here.

Did you replaced the MAF or just cleaned?

[Three_thirty_I]

There's no problem it that part of the intake is damaged or leaking, it's from the MAF sensor to the intake manifold that cannot have any vacuum leaks, so after the air filter where the MAF is located, anything before that it not going to cause any issues since that is not yet measured.

[alx.]

Originally Posted by jan31

Did you replaced the MAF or just cleaned?

Replaced with brand new siemens VDO

Originally Posted by Three_thirty_I

There's no problem it that part of the intake is damaged or leaking, it's from the MAF sensor to the intake manifold that cannot have any vacuum leaks, so after the air filter where the MAF is located, anything before that it not going to cause any issues since that is not yet measured.

I understand, i just reset the throttle adaptations using the steps here and it seems to run better(i wonder for how long). Also unplugged and plugged the maf back in

Car feels like a monster again, i doubt it's going to last long though.

[ZeroSum]

Originally Posted by Three_thirty_I

There's no problem it that part of the intake is damaged or leaking, it's from the MAF sensor to the intake manifold that cannot have any vacuum leaks, so after the air filter where the MAF is located, anything before that it not going to cause any issues since that is not yet measured.

Mine doesnt connect very well either. I wonder if its getting something like heatsoaked due to the leak....

[alx.]

Originally Posted by ZeroSum

Mine doesnt connect very well either. I wonder if its getting something like heatsoaked due to the leak....

To be fair i doubt it has anything to do with it. What have you changed so far? Is it throwing any codes?

[Three_thirty_I]

I must say, I have wondered about the possibility of heatsoak affecting the MAF, the air box gets really hot if the car is standing still, or has stood for a while. But, considering how much air gets breathed in when the engine is making power, chances are that it's not as bad as one would think.

[ZeroSum]

Originally Posted by alx.

To be fair i doubt it has anything to do with it. What have you changed so far? Is it throwing any codes?

No codes....New plugs, and coils, vcg and vc, cleaned the vanos and the maf.

[alx.]

Originally Posted by ZeroSum

No codes....New plugs, and coils, vcg and vc, cleaned the vanos and the maf.

Have you also checked the Eccentric shaft sensor for any oil residue? Also, i would recommend replacing the solenoids instead of cleaning them, they're pretty cheap.

[ZeroSum]

Originally Posted by alx.

Have you also checked the Eccentric shaft sensor for any oil residue? Also, i would recommend replacing the solenoids instead of cleaning them, they're pretty cheap.

I have been trying to stay away from the ESS.

[alx.]

Originally Posted by ZeroSum

I have been trying to stay away from the ESS.

Try taking it out, it's a 5 minute job to just unplug it and inspect for oil inside of the connector or the plug, if so you can either clean it with some compressed air/cotton swabs but you will need to replace the gasket. The ESS itself is pretty expensive.

[alx.]

Rceived an airmass code....the MAF is brand new but at least we're getting somewhere.

What else could cause an airmass error? I also changed the two o2 sensors PRE-cat, should i also change the post cat ones? DISA valve?

[SSJTrunks523]

Any solution to this? My N52B30 is doing pretty much exactly what you are describing. I have semi-given up on it being a vehicle that I can trust, and was assuming the motor was going (along with a whole 'nother list I don't want to get into), but if you get some luck, I'd love to know what happened!

[ZeroSum]

Any update?

[stewey]

I'm still trying to chase mine down. So far: ESS, plugs, coils, cleaned solenoids and check valves. No codes to speak of except for one MAF code 2000km ago, so I just ordered a new MAF.

If the MAF doesn't fix it I'll be taking it to the dealer or an indy.

[alx.]

I've taken it to four different mechanics, the last one said it's an internal issue with the engine perhaps vanis/valvetronic. I'm pretty much considering selling the car as there are no good mechanics in Romania for Valvetronic or Vanos, everyone here has a diesel...pretty much given up hope

[alx.]

Would the ECC cause 2D06 - Air Mass System? It had little to no oil when i checked it and i did change the gasket/ clean the connector and sensor with contact cleaner.