UR Quattro flat spot - Page 2

Thebishop · 16-02-19, 09:07 PM

Thanks for that I'll start my detective work hopefully early nxt wk and I'll keep you all posted. Again thanks for all the advice.

Thebishop · 19-02-19, 03:27 PM

Was up at the car today and I realised that the turbo gauge goes 0-1-2 and when I have my engine running no acceleration the turbo gauge is sitting in the middle at one and if I rev it it goes beyond 2???? Help please

BackintheFold · 19-02-19, 03:39 PM

Quote:

Originally Posted by Thebishop

Was up at the car today and I realised that the turbo gauge goes 0-1-2 and when I have my engine running no acceleration the turbo gauge is sitting in the middle at one and if I rev it it goes beyond 2???? Help please

(1) in the centre of the dial is one atmosphere pressure-which is what we all live in every day.
(2) on the right of the dial is 2 atm, or 29psi, which is when turbo ison boost.
EDIT-which is 14psi above normal.

(0) on left is on overrun when there is a vacuum in the pipe.
HTH

Have you checked the air flow sensor connections and cleaned it?

Thebishop · 19-02-19, 03:42 PM

Thanks for the quick response I will look at that next wk with my mechanic buddy as I'm not mechanically minded.

Thebishop · 28-02-19, 10:25 PM

Ok so as promised a update.
Check hose from turbo to manifold. All good nothing blocked etc.
Check and cleaned MAF sensor.
However the turbo gauge is still all over the place?
Also when we were checking connections etc I broke the engine temp sensor top one that site on the side of the block from the top rad hose if that makes sense.
Took car for drive and flat spot is gone .

Would this temp sensor affect performance or anything?

And finally this sensor does someone know the part no or where I could get one please.

BackintheFold · 28-02-19, 10:31 PM

So cleaning the air flow sensor fixed the problem, and now you have a broken sensor?
Also what exactly is the boost gauge doing?

Thebishop · 28-02-19, 10:35 PM

Yes cleaning the maf seemed to work a treat.

But once this was done we were just checking for loose connections a it just snapped off.

Boost gauge is like it's possessed it just all over the place car can be stationary and it's reading 2 bar etc

BackintheFold · 28-02-19, 10:42 PM

Iirc, the boost sensor is a part of the ECU. In the good old days, I seem to remember taking a boost sensor from an Audi 200 turbo, and wiring it up to the WR ECU (it was not a direct fit)
It sounds like your sensor is not well-you may get away with cleaning connections.
I also think the sensor affects the fuel supply-if the car thinks it is in boost it will pump in more fuel.
Can you borrow a known good ECU and see if that helps?

Thebishop · 28-02-19, 10:52 PM

I don't know anyone else with a ur Quattro near me.
Any other suggestions or would you think that'd the cause of my possessed turbo gauge

BackintheFold · 28-02-19, 10:56 PM

I would think that if the boost gauge was accurately showing the boost, your engine would be idling very erratically and driving like a &&@&, which makes me think it's the sensor giving problems.if you are happy to remove the ECU and clean the sensor connections that's the next step in my suggestions, but happy for anyone to suggest something else.

19-02-19, 03:27 PM	#12
Thebishop Grown up member Join Date: Jan 2018 Posts: 40	Turbo gauge Was up at the car today and I realised that the turbo gauge goes 0-1-2 and when I have my engine running no acceleration the turbo gauge is sitting in the middle at one and if I rev it it goes beyond 2???? Help please

16-02-19, 09:07 PM	#11
Thebishop Grown up member Join Date: Jan 2018 Posts: 40	Thanks for that I'll start my detective work hopefully early nxt wk and I'll keep you all posted. Again thanks for all the advice.

19-02-19, 03:42 PM	#14
Thebishop Grown up member Join Date: Jan 2018 Posts: 40	Thanks for the quick response I will look at that next wk with my mechanic buddy as I'm not mechanically minded.

28-02-19, 10:25 PM	#15
Thebishop Grown up member Join Date: Jan 2018 Posts: 40	Ok so as promised a update. Check hose from turbo to manifold. All good nothing blocked etc. Check and cleaned MAF sensor. However the turbo gauge is still all over the place? Also when we were checking connections etc I broke the engine temp sensor top one that site on the side of the block from the top rad hose if that makes sense. Took car for drive and flat spot is gone . Would this temp sensor affect performance or anything? And finally this sensor does someone know the part no or where I could get one please.

28-02-19, 10:31 PM	#16
BackintheFold Senior Member Classic Audi Club Member Join Date: Feb 2019 Location: Near an MB ur Quattro Posts: 1,171	So cleaning the air flow sensor fixed the problem, and now you have a broken sensor? Also what exactly is the boost gauge doing?

28-02-19, 10:35 PM	#17
Thebishop Grown up member Join Date: Jan 2018 Posts: 40	Yes cleaning the maf seemed to work a treat. But once this was done we were just checking for loose connections a it just snapped off. Boost gauge is like it's possessed it just all over the place car can be stationary and it's reading 2 bar etc

28-02-19, 10:42 PM	#18
BackintheFold Senior Member Classic Audi Club Member Join Date: Feb 2019 Location: Near an MB ur Quattro Posts: 1,171	Iirc, the boost sensor is a part of the ECU. In the good old days, I seem to remember taking a boost sensor from an Audi 200 turbo, and wiring it up to the WR ECU (it was not a direct fit) It sounds like your sensor is not well-you may get away with cleaning connections. I also think the sensor affects the fuel supply-if the car thinks it is in boost it will pump in more fuel. Can you borrow a known good ECU and see if that helps?

28-02-19, 10:52 PM	#19
Thebishop Grown up member Join Date: Jan 2018 Posts: 40	I don't know anyone else with a ur Quattro near me. Any other suggestions or would you think that'd the cause of my possessed turbo gauge

28-02-19, 10:56 PM	#20
BackintheFold Senior Member Classic Audi Club Member Join Date: Feb 2019 Location: Near an MB ur Quattro Posts: 1,171	I would think that if the boost gauge was accurately showing the boost, your engine would be idling very erratically and driving like a &&@&, which makes me think it's the sensor giving problems.if you are happy to remove the ECU and clean the sensor connections that's the next step in my suggestions, but happy for anyone to suggest something else.