Power surge and rough idle 323i automatic

[Amarath]

Hi guys first post with annoying issue.

After about 30 min of driving from a cold start, so effectively once the engine has warmed up all the way, if I come to stop I get between 500 to 1000 rpm power surge and rough dipping idle, almost to the point of engine cut off.

Cleaned out the vanos solenoids help for a day or two and then it came back, 5 months back had a new tappid cover installed due to a bust diaphram, can't remember what it was called. But it's getting progressively worse. Had it checked and no error codes come up.

Will really appreciate your advice it's really annoying and hurts my heart when I hear and feel that my baby is not in optimum condition.

 

[Blue Shirt]

Check for vacuum leaks on the intake, or torn intake rubber bellows. Also inspect the DISA flap to that it is working properly and the flap is not loose or broken off.

 

[Amarath]

Check for vacuum leaks on the intake, or torn intake rubber bellows. Also inspect the DISA flap to that it is working properly and the flap is not loose or broken off.

Thank you very much, I will do that this weekend and give you feedback as to the outcome

 

[Amarath]

Check for vacuum leaks on the intake, or torn intake rubber bellows. Also inspect the DISA flap to that it is working properly and the flap is not loose or broken off.

Thank you very much, I will do that this weekend and give you feedback as to the outcome

 

[husaindindar]

Hi

Sound like an oil separator/breather issue.
Check the separator and all the hoses going to the manifold, crankcase etc.

 

[Amarath]

Hi

Sound like an oil separator/breather issue.
Check the separator and all the hoses going to the manifold, crankcase etc.

I will do that aswell will give her a nice engine wipe down and check to see eveything in order and if possible take some pics. Thank you for the advice

 

[Amarath]

Check for vacuum leaks on the intake, or torn intake rubber bellows. Also inspect the DISA flap to that it is working properly and the flap is not loose or broken off.

Thank you very much, I will do that this weekend and give you feedback as to the outcome

So I did eveything and found my upper DISA flap like this, where can I get a replacement and what's the cost looking like, keep in mind I have not checked the lower DISA flap yet

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[husaindindar]

Hey bud.


You need to look for the flap if you haven't found it yet!
Check the intake (remove it if you have to!). Do not let the engine swallow it!


My DISA also gave up. The flap got loose on the shaft. However it was all still attached to the unit. Nothing got loose to enter the motor.

Dealer wanted R 5500.
Ended up fixing it with an aluminium kit I got off ebay.
https://vanos-bmw.com/repair-kit-for-disa-bmw-engine-n51-n52-n52n-n52k


Theres a tutorial on youtube. I used QBond to close everything up.

 

[Amarath]

Hey bud.


You need to look for the flap if you haven't found it yet!
Check the intake (remove it if you have to!). Do not let the engine swallow it!


My DISA also gave up. The flap got loose on the shaft. However it was all still attached to the unit. Nothing got loose to enter the motor.

Dealer wanted R 5500.
Ended up fixing it with an aluminium kit I got off ebay.
https://vanos-bmw.com/repair-kit-for-disa-bmw-engine-n51-n52-n52n-n52k


Theres a tutorial on youtube. I used QBond to close everything up.

Hey man thanks for the info, it's really appreciated, I have searched and searched and could not find anything, I do belive that this has been like this since the previous owner, as I found that there was a bolt missing from my intake manafold and a bolt has been sheerd on the engine mount behind the oil filter, so I believe that this happened while the previous owner had it, I am trying to sourse an osilascope so I can see inside the manafold without taking its off as I have already put it back together and iam super busy this week with meeting and wount get a gap to take the time to remove everything again until the weekend.

So im hoping that this was done and then left like that by the previous owner, and her service person and that it was removed and just the empty shell was put back, the center shaft is loose and is not moving in any direction.

So unfortunately I need my car and I have no other means of transport, iam a sales consultant so Im on the road all the time unfortunately.

Iam in bit of trouble with the if I'm wrong and that flap and steel pin is still in there.

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[Blue Shirt]

You should able to get a replacement disa from goldwagen or imcomex.

However, I would not drive the car until you are 100% certain that there are no fragments in the intake. Any debris left in there will destroy the valves if its gets sucked in there.

 

[Amarath]

You should able to get a replacement disa from goldwagen or imcomex.

However, I would not drive the car until you are 100% certain that there are no fragments in the intake. Any debris left in there will destroy the valves if its gets sucked in there.

Well then I guess iam spending tomorrow taking it all out again and taking the manifold off

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Thank you for all your advise and assistance, it's very much appreciated. Have a leka night further

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[Amarath]

You should able to get a replacement disa from goldwagen or imcomex.

However, I would not drive the car until you are 100% certain that there are no fragments in the intake. Any debris left in there will destroy the valves if its gets sucked in there.

Hey blueshirt, thank you for the advise, you saved me alot of trouble, I spend my morning taking eveything apart got the manifold off and shook it and turned it upside down and inside out couldn't hear anything, then checked in one of the stems of the manafold and the flap was lodged in there, and that little steel stud was wedged between the flap and the wall of the manifold stem, had that come loose it would have gone straight into my pistols and I would be in world of trouble.

I will order my replacement part tomorrow from goldwagen and install it this weekend coming up.

Thank you all for the assistance

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[Blue Shirt]

You were very lucky bud, and you certainly dodged a bullet this time.

Thanks for taking good advice in a positive spirit. I hope you get your car purring smoothly again.

 

[Amarath]

You were very lucky bud, and you certainly dodged a bullet this time.

Thanks for taking good advice in a positive spirit. I hope you get your car purring smoothly again.

I should have been in the matics it seems, iam glad my luck didn't run out. Thank you for taking the time to actually reply and give that advice.

I hope so too. You deserve a bells.

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[Blue Shirt]

No problem bud.

I assume you have now checked the lower disa as well to confirm its condition?

 

[Amarath]

No problem bud.

I assume you have now checked the lower disa as well to confirm its condition?

I did check for the secondary but there wasn't one, they are normally on the inside of the manafold but mine didn't have one, I also didn't have any other connectors, my engine is naturally asperated so I don't think I needs a high volocity disa valve as there is no turbo

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[husaindindar]

I think the 323 has a single stage intake, so there might not be the smaller DISA.
You really dodged a f*kn bullet there!!
Had it gone in, you would've been in for a serious bill!


Do let us know the prices for replacement.
Also consider the import that I suggested. It worked for me.



BTW.
I did drive my car without a DISA flap for a while. It was flapping around causing surging at high RPM. I broke the flap and shaft out and drove till I got the parts.

 

[Amarath]

I think the 323 has a single stage intake, so there might not be the smaller DISA.
You really dodged a f*kn bullet there!!
Had it gone in, you would've been in for a serious bill!


Do let us know the prices for replacement.
Also consider the import that I suggested. It worked for me.



BTW.
I did drive my car without a DISA flap for a while. It was flapping around causing surging at high RPM. I broke the flap and shaft out and drove till I got the parts.

I really did dodge a bullet, so replacement cost form goldwagen is R 3650. Ouchie. so iam considering getting a second hand unit but iam not to sure about the quality and longgevity of the part. So iam on the fence.

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[Amarath]

So gents here is quick update after Sunday, for some unknown reason there is nothing but POWERRRRRRRRRRRRRR.

I can't explain it, leaving the garage this morning I turned a corner and put my foot down like I normally do and bang my ass swings out and iam drift kinging in morning traffic, highway driving is incredible, fuel consumption is slightly lower on highway driving and overall engine niose is very very plessant.

Needless to say iam happy I fixed this issue and followed your advise.

Everyone is out of stock on the disa unit so I have ordered one and when it gets here I'll install it.

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