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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old January 3rd, 2018, 14:00   #1
duckdive
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Exclamation Golf TDI - MAF and Turbo - black smoke

My 2005 Golf TDI (170k miles) had a P0101 MAF sensor issue that my cheap OBDII reader picked up on (CEL was lit).

I drove with it for a bit, and everything was ok. I finally got around to purchasing a new MAF (after trying to clean), and I installed it the other day.

Upon driving with the new MAF sensor, the car drove poorly. Lack of power, black smoke, surging, no turbo, more black smoke.

I checked the OBD, and now I'm getting the P0101 and P0299 (turbo underboost).

I decided to put my old MAF back in. Same driving, though I only went around the block cause I didn't want to do any damage.

Looking for advice. I am ok taking it to a shop, but I don't really want to drive it like this. Is there anything that I can reset? Or something I should check to get it back to before the swap?

Are there any other parts that a novice can install that might help?
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Old January 3rd, 2018, 14:07   #2
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Btw, this is the MAF part that I purchased to replace.
https://www.amazon.com/gp/product/B0049PLFFG
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Old January 3rd, 2018, 14:13   #3
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Oh, and the other thing that was weird is when I'm driving it sounds like air is being sucked in from the cabin when I press to accelerate... I might be mistaken, but there was definitely some kind of air noise.
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Old January 3rd, 2018, 14:19   #4
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Now you know it's not the MAF.
Check and clean the connector and read this-
From the Ross Tech wiki
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Old January 3rd, 2018, 14:57   #5
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So crazy that changing the MAF... then the problem immediately appeared.
I'll clean/check the connection and check into the Wiki.
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Old January 3rd, 2018, 16:11   #6
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Have you checked for boost leaks?
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Old January 3rd, 2018, 16:18   #7
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Novice here. No, I haven't checked for boost leaks. Wouldn't even know where to start.
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Old January 3rd, 2018, 20:48   #8
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definately sounds like one of your boost hoses popped off.
Check the hoses going in and out of the intercooler and the one going into your intake at the egr.
Usually you will have a greasy, grimmy, oily spot where the leak is.
Usually the hose is only partially off and is still connected but crooked......if that makes any sense.
Here is one way to fix a leaking boost hose at the egr....
https://www.youtube.com/watch?v=hwyI5S1gLow
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Old January 3rd, 2018, 21:24   #9
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Thanks Maxmoo for the further info. Interestingly enough, I just got time after putting the little guy to bed to get back online to search more... and of course, good ol ThomasEXOVCDS has a video like the one you posted (https://www.youtube.com/watch?v=Zwv_3slulIE)
I was just going back to post this new info, and I saw your post too.
Now the boost question makes sense. Yes, I have some oil/grime there too, and it is a bit loose.
For $31, I already ordered.
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Old January 4th, 2018, 14:54   #10
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I found my boost leak spraying soapy water on the boost tubes & connections with the car running.
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Old January 9th, 2018, 10:03   #11
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I've installed the KermaTDI collar this am. Drove to work. The Golf seemed a bit more peppy, but still a bit sluggish and slow to boost/shift gears.

I'm wondering is the computer needs to relearn/adjust. Is there any other procedure I need to do following collar install? to reset? or anything else like that?
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Old January 9th, 2018, 11:19   #12
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Honestly I think there may be other leaks in pipes from turbo to intercooler and past.

Easiest to see from under the car.
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-BMW 328is Manual (heavily modded 220whp, track toy)
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Old January 13th, 2018, 13:17   #13
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Well, yes the underside shows that there is definitely a hose off.
https://photos.app.goo.gl/guBaatzJafHCgl6n2
It looks like it might have the same type of connector as the one on the top (that I got the Kerma collar for).
Does this one tend to come off because of the connectors? Or do you think a sloppy mechanic didn't connect it correctly (I had the CV done recently)?
Also, my plastic skid plate is off. I was broken, so I had to keep it from dragging. Maybe the road caused the hose to come off. I'm going to source a new skid.
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Old January 13th, 2018, 13:34   #14
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Quote:
Originally Posted by duckdive View Post
Well, yes the underside shows that there is definitely a hose off.
https://photos.app.goo.gl/guBaatzJafHCgl6n2
It looks like it might have the same type of connector as the one on the top (that I got the Kerma collar for).
Does this one tend to come off because of the connectors? Or do you think a sloppy mechanic didn't connect it correctly (I had the CV done recently)?
Also, my plastic skid plate is off. I was broken, so I had to keep it from dragging. Maybe the road caused the hose to come off. I'm going to source a new skid.
Mechanic or road, no matter now.
Sounds like you're getting to the bottom of this, good!
Because of the low to the ground aluminum oil pan, I would recommend something more metal than plastic underneath.
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Old January 13th, 2018, 17:57   #15
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Yea, as expected (from you mentioning smoke present).

Keep in mind that your engine received 0 filtered air, and pulled in pretty much only air with road dirt through that tube. So the sooner it's fixed, the better.
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-BMW 328is Manual (heavily modded 220whp, track toy)
-BMW Z3 Roadster (Fun in the sun car)
-BMW Z3 M Coupe (1 of 36)
-BMW 328d wagon (Self tuned ~230hp)
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