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Author Topic: 2.0 TDI 170 PROBLEM  (Read 3083 times)

Offline Schuey

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2.0 TDI 170 PROBLEM
« on: 16 October 2009, 23:27 »
My 2.0 170 TDI makes a kind of back pressure & vibration (Like the exhaust is blowing) at around 2000rpm, engine sounds ok but fuel consumption has dropped to 30mpg or less?  Also it does seem a little underpowered.

Any ideas?
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Offline danny_p

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Re: 2.0 TDI 170 PROBLEM
« Reply #1 on: 17 October 2009, 01:25 »
sorry TBH  it has an OBD port for a reason.

these engines are complex creatures and speculating about faults from symptoms  even when its infount of you can lead to expensive and pointless wild goose chases. really any diagnosis over a forum is odds on going to be a load of bollox.

i would suggest ether getting your self a copy vagcom and a lead from rosstec, or a pikey one off ebay.  that should point out the issue more presisely  but it sounds as if its turbo / boost controll related 
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Offline Schuey

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Re: 2.0 TDI 170 PROBLEM
« Reply #2 on: 17 October 2009, 13:08 »
Quote from: danny_p on 17 October 2009, 01:25
sorry TBH  it has an OBD port for a reason.

these engines are complex creatures and speculating about faults from symptoms  even when its infount of you can lead to expensive and pointless wild goose chases. really any diagnosis over a forum is odds on going to be a load of bollox.

i would suggest ether getting your self a copy vagcom and a lead from rosstec, or a pikey one off ebay.  that should point out the issue more presisely  but it sounds as if its turbo / boost controll related 

Yeah already put it on VAGCOM & no faults, hence the reason for my question.  Lots of people on Audi forums have stated MAF problems on A3 2.0 TDI's..............Maybe a similar problem to them.....?
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Offline AudiA8Quattro

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Re: 2.0 TDI 170 PROBLEM
« Reply #3 on: 20 October 2009, 19:03 »
MAF's and EGR valves are known problems on diesels.
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Offline chall

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Re: 2.0 TDI 170 PROBLEM
« Reply #4 on: 21 October 2009, 06:48 »
is it when backing off the throttle? i've had that before at work on a Leon and it was the turbo itself!!! i highly recommend putting it into a VAG specialist for diagnosis
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Offline Schuey

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Re: 2.0 TDI 170 PROBLEM
« Reply #5 on: 23 October 2009, 13:18 »
No it only happens when you accelerate through 2000 -2500 revs. 
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Offline Rhyso

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Re: 2.0 TDI 170 PROBLEM
« Reply #6 on: 23 October 2009, 13:36 »
do you have thick black smoke coming out of the back??

Could possibly be a boost leak  :undecided:
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Offline Schuey

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Re: 2.0 TDI 170 PROBLEM
« Reply #7 on: 23 October 2009, 17:42 »
Quote from: Rhyso on 23 October 2009, 13:36
do you have thick black smoke coming out of the back??

Could possibly be a boost leak  :undecided:

Nope nothing at all, just the vibration/humming from the rear?
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Offline Schuey

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Re: 2.0 TDI 170 PROBLEM
« Reply #8 on: 24 October 2009, 22:13 »
Stuck on this, could it be the exhaust?  Does sound like the vibration is from that area?
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Offline snap-on

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Re: 2.0 TDI 170 PROBLEM
« Reply #9 on: 25 October 2009, 19:59 »
Blocked cat or backbox ? if it dont chuck out black smoke then boost pipes are ok ! if no codes then maybe exhaust prob , can you unbolt just the rear box and try without it or is it a one piece factory system every car seems to have lately ?
trouble is if its blocked exhaust prob it should dob it at all revs and be underpowered
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