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B5 Forum 1996-2001.5 Audi A4 / 2000-2002 Audi S4 & Audi RS4. (Audi A4 Forum, Audi S4 Forum, Audi RS4 Forum)

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Old 03-09-2006, 12:22 PM   #1 (permalink)
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mattbrown98
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Hey!

I have a loss of power problem with my Audi A4 1996 1.9TDI AFN engine. The car performs very well to say it has done 256,000 miles but just over the last couple of months it has started to loose large amounts of power and i think it goes into a 'limp home mood' where it doesn't seem to want to exceed 3 thousand revs or so in any gear unless you switch off the ignition and restart it which seems to clear the fault and it runs normal again.

The loss of power always occur's when i am either overtaking or have my foot flat down on the accelerator (only in 3rd or 4th gear) and the car feels as if it has almost come to a stand still which is quite scary when overtaking.

Some people have suggested to me that the Air Mass Meter AMM might be the fault and that a way of checking this out would be to dis-connect it and then see how the car performs. I did this and the car performed even worse as if it was in the limp home mood before i even sat off!

Does anybody have any suggestions as the fault for this or any solutions, i would be very grateful? And in theory if the AMM was the fault would disconnecting it solve the poblem?

Thankyou Matt
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Old 03-17-2006, 02:37 PM   #2 (permalink)
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biker_bits
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I got the same fright as I bought mine. I was very scared it will cost fortune in parts.
Found it was a very dirty (due to rocker gasket leak) connector for the turbo solenoid, which mounted on the front of the engine, LHS (facing the car), next to cambelt cover. There is a thin pipe going to it from the top of the turbo assembly to it
Run the engine up (cold is good as you won't burn your hand!) and fiddle with the connector. You may suddenly feel the solenoid clunk and the engine sound will change. If so, iggy off, unplug and clean the connector and the socket on the solenoid. Hopefully that will be it!
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Old 03-21-2006, 10:23 AM   #3 (permalink)
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Firefighter1369
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Hi there,
I also have an Audi A4 avant with exactly the same problem as you matt.When i accelerate hard the power just goes and the car go's into limp home mode.I have just fitted a new MAF this afternoon and took the car for a spin but no change there.Have had a fiddle with the connector for the turbo solenoid but to no avail.Does anyone have any other idea's as i have run out of them...?????
Hope someone could help.Thanks in adance

Chris.
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Old 03-22-2006, 06:45 AM   #4 (permalink)
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mattbrown98
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Glad it isn't just me then mate. Ive had a go with the MAF and the solenoid connector aswell and still no change, getting really frustrating.

Have you had your car into the dealers at all? as i think that is my next and only option but not happy about paying the prices!
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Old 03-22-2006, 09:44 AM   #5 (permalink)
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Firefighter1369
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HIya Matt,
No havent had it to the dealers as yet as im like you i dont like paying there silly prices for a dyognostic test.I also have the same engine as you but mine is an automatic.i spent 88 yesterday on fitting the MAF but no change.My partners not too happy at the moment with me
Anyway if i do find out what the problem is i will be right back here to tell you, and if you have any luck i would appriciate it if you could reply also matt.Cheers mate.

Chris
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Old 03-27-2006, 10:26 AM   #6 (permalink)
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mattbrown98
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Yeah mate i will post a note here as soon as i find out what the problem is, if i ever do!

Just been having a play with the turbo recently just checking the inlet and outlet pipes to it to see if they are clogged up and if the turbo spins freely, trouble is though i dont think my little mechanical skills and knowledge are going to help me much but i will persevre. turns out they are a bit messy so will give it a lil clean when i get time and see if that does anything!

matt
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Old 03-27-2006, 11:40 AM   #7 (permalink)
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spoonz
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I had a 1.9tdi avant which had a similar problem and it was a blockage in the hose that ran from the Turbo area to the ecu from what the dealership told me.

Sounds like you might have a similar problem if the pipes look very dirty.
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Old 04-06-2006, 04:01 PM   #8 (permalink)
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BoomBox
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Hi guys, I'm new here and also new to turbo problems. My brother has a A4 1.9 TDi with similar problems that you have described here. My question is: What does the solenoid do?
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Old 05-25-2006, 09:59 AM   #9 (permalink)
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lscolman
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Hi,

I also have the same issue with my 1996 A4 TDI.

I've just posted in this thread some details of what I have tried, which may offer some help.

Someone must know what is causing this. Please!

Mine has 126,000 miles on it, and I have just had the manifold cleaned out. It was blocked, but still the problem is there!

Bit embarrasing when Austin Metro's go flying past you...

Is anyone else seeing oil in connector which goes from the ECU (top right of the engine) to the Manifold. Mine was blocked with oil and the ECU contained quite a bit of oil. A suggestion is that the diaphagm in the ECU which deals with air flow could be clogged up with oil. Is anyone else able to check?

Other suggestions have been a poorly diesel pump, but I can't afford to go there. Mrs Miggins in her Austin Metro can overtake me as much as she likes for the price of one of those...

This TDI power loss thing is becoming a bit of a club, but not one I'm that keen on being a member of!

Cheers, Lee
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Old 01-13-2007, 08:39 AM   #10 (permalink)
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Donald M is on a distinguished road
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Hi there,

I am now a member of this club too. I have a 1997 with AFN engine and 134K on on the clock. The exact same problems as above and I have replaced the MAF but to no avail.

Have just spent an hour looking at it in a howling gale here in Inverness and noticed that there is a plastic spherical thing rattling around under the turbo. It has a pipe going to it and seems to be involved in the turbo process. Does anyone know what it is?

Also, can anyone tell me I can locate the ECU and the hoses that go to it?

Regards, Donald
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