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Discussion Starter · #1 ·
Hi guys.

Having a power issue with my n47 320d 177.

Car has, dpf gutted, EGR blanked and swirl flaps removed. Mileage is 113k miles. Not showing any fault codes.

Had it on a dyno a few days ago and it only put out 147bhp. Not surprised either, it's low down power isn't the best.
Remap guy still put the remap on but told me to take it easy as he suspects it's the turbo actuator. Also didn't run it after remap to be safe.

Brought it to BMW specialist today who had it for over two hours trying to diagnose it.

He feels that it's not turbo related but MAF related. He swapped one from another car he had there and said he felt it drove a little better.

When I got home I swapped my MAF with the one from my dad's 320d (which drives better than mine with 160k) and I noticed a slight improvement but not all that much. Certainly not a +200 BHP car. Maybe his isn't great either ? Both mafs are dated 2008.....

Could a bad MAF really knock 20-30 BHP off a car ?

Can the actuator be faulty while not showing fault codes ?

And could that intercooler pipe (pictured below) be the cause ? I've being told it's quite normal.

Cheers.

273859
 

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Oil in the intercooler pipe is quite normal, but the oil splatter around it would suggest it's not sealing, which would definitely cause a loss of power.
 

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Discussion Starter · #4 ·
That's an old photo from last year when I was changing the xenon's and was looking at it properly last night and not sure if I've notice a hole around the connection part ? Like as if it broken apart.

I'll stick the mirror down there later on to be sure.

273872
 

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Discussion Starter · #5 ·
Yes but i would think a fault code would show up.

That's what the mechanic said yesterday leading him to believe it could be the MAF. He says they can go bad without throwing a fault code. A new Bosch one is expensive enough so I need to be sure.
 

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I am not a mechanic but swirl flaps would never have them removed on a n47 intake manifold. That is not advisable on the way they work. If this low power problem have started since car had that done I would related to that. About the maf you could try remove and clean it as it would be good enough once cleaned to see a difference. Just though to give my opinion and I know I could be wrong but someone more pro can possibly advise better

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Discussion Starter · #7 ·
Yeah I agree. I'd rather have them but it's not worth the risk of them breaking. I was at one stage considering of the remanufactured manifolds from Germany on eBay.

Either way there's no way flaps would knock 30hp of a cars power otherwise nobody would be getting them done.
 

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Discussion Starter · #9 ·
Got into the car today and as I took off it was back to its normal power. Didn't last long unfortunately. Once in a while it does tend to happen. Maybe it is the actuator ? Never heard of a vacuum leak operating on a part time bases 😅

Rubbed a bit of tissue around the intercooler pipe earlier and there was definitely fresh oil on it. I dread to think what's inside the intercooler 😬
 

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Got into the car today and as I took off it was back to its normal power. Didn't last long unfortunately. Once in a while it does tend to happen. Maybe it is the actuator ? Never heard of a vacuum leak operating on a part time bases 😅

Rubbed a bit of tissue around the intercooler pipe earlier and there was definitely fresh oil on it. I dread to think what's inside the intercooler 😬
I've got the older M47 and trust me, if oil can escape from somewhere, it will.

They're not clean older diesels unfortunately.
 

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Got into the car today and as I took off it was back to its normal power. Didn't last long unfortunately. Once in a while it does tend to happen. Maybe it is the actuator ? Never heard of a vacuum leak operating on a part time bases 😅

Rubbed a bit of tissue around the intercooler pipe earlier and there was definitely fresh oil on it. I dread to think what's inside the intercooler 😬
Maybe the oil is clogging the hole ...

Get the intercooler off and clean all the air intake system while you're at it including air oil and especially fuel filters.

I can't understand why you have a map put on a car that's having issues ..
 

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Have you tried the MAP sensor?? Last time my M47 felt down on power, I changed the MAP sensor. It's all covered in oil and affecting readings. Turbo did not spool up right with bad MAP sensor.
 

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Discussion Starter · #16 ·
Maybe the oil is clogging the hole ...

Get the intercooler off and clean all the air intake system while you're at it including air oil and especially fuel filters.

I can't understand why you have a map put on a car that's having issues ..
He put it on as he was mapping out the dpf at the same time but told me to drive it easy as he feels it could be the actuator.
 

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Discussion Starter · #18 ·
Have you tried the MAP sensor?? Last time my M47 felt down on power, I changed the MAP sensor. It's all covered in oil and affecting readings. Turbo did not spool up right with bad MAP sensor.
No but I had the swirl flaps removed last November which was probably only 6k miles ago so I'm assuming it would of being cleaned when they cleaned the manifold.
 
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