Multivan losing power?

[shogun2]

Hi all,

The Multivans' in the shop for some wok on the sat nav and doors. In the mean time the dealer has lent us a 77Kw TDI Transporter. What I have noticed is that there is significantly more "go" in the Transporter with the lower powered donk than there is in my 2005 128Kw TDI.
Is there anything I should be looking at that may be slowing down the response of the Multivan? It just seems sluggish in comparison.

Rod

[Umai Naa!!]

The Mulitvan is somewhat heavier, so bare that in mind.

Does your Multivan have the AXE engine in it? If so, it might have a cracked exhaust manifold.

[coastie]

Are the AXE engines prone to have cracked manifolds more than other engines?

[shogun2]

How do I find out what engine the MV has in it? It's a 2005 version.

[h100vw]

Inside the service book there's a sticker. The engine code is on that.
I am thinking it might be a MAF.
Gavin

[Golf Loon]

Is yours auto and the loan one a manual?

[shogun2]

No - both manual.
Gavin, what's a MAF?

OK - just googled it - Masss Air Flow sensor! How would this affect the performance? How would I ask the dealer to check it?

[thevwbug]

I am with cracked exhaust Manifold....

Have you had issues with exhaust fumes in the cabin?

[h100vw]

No - both manual.
Gavin, what's a MAF?

OK - just googled it - Masss Air Flow sensor! How would this affect the performance? How would I ask the dealer to check it?

The MAF measures airflow but if they fail it'll still run, just not as well. Does it feel to be actually down on power, do you remember a time when it went much better??

VAG-COM can read the MAF and tell if it has quit.

Gavin

[shogun2]

I think it has been a lot more responsive before, but it's been five years since it was new, so it is a bit had to remember. Should I ask the dealer to run vagcom and look for error messages while they have it?

[gregozedobe]

How do I find out what engine the MV has in it? It's a 2005 version.

The easiest place to find it is the first 3 letters of the engine number from your rego papers. My 128Kw mit DPF is "BPC".

[h100vw]

I think it has been a lot more responsive before, but it's been five years since it was new, so it is a bit had to remember. Should I ask the dealer to run vagcom and look for error messages while they have it?

They would scan it as part of a service anyway. Probably worth mentioning that it it feels down on power though.

Gavin

[shogun2]

OK
Just arrived in Sydney.
Noticed lack of power when changing down from 6th to 5th to overtake. Engine just took what seemed forever to rev in the mid range under load. Bit frustrating! Could have your foot flat to the floor waiting for the engine revs to catch up.
Any suggestions? Maybe there's someone here in Sydney who could have a look?

[Transporter]

I'd go to independent VW mechanic and get it diagnosed with VCDS.
You can also check the MAF sensor yourself it's easy look in this thread post 2. you can use voltmeter on pin. 5 use long leads on VM and take it for drive. Use graph in the thread for comparing your results.

[gregozedobe]

Any suggestions?

Some other suspects are:

Crap fuel (will fix iteself once you use up most of the "bad" fill and refill with good fuel)

Dirty/partially blocked Air filter

Partially blocked Fuel filter

Boost leak (intake pipes)

Partially blocked injectors

Turbo vanes stuck in low boost position - rare (but still should produce normal power above approx 2,500 rpm)

Have you noticed any other symptoms (eg excessive smoking, engine slow to warm up, running too hot, tapping noises from cams).