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Author Topic: Loss of power and mystery object  (Read 147 times)

Offline slow-n-steady

  • *
  • Posts: 24
  • Thanked: 0
  • Model: Alhambra Mk1
  • Spec: 01 TDI 115 AUY+EHH
  • First Name: Steve
  • Region: South West
Loss of power and mystery object
« on: June 29, 2021, 07:50:56 PM »
Hi everyone.
1.9 TDI AUY engine.
Runs smoothly but will not accelerate.  Reaches legal max eventually. 
Turbo actuator travels half inch with hand vac pump.  Pipe from solenoid to turbo actuator holds vacuum. 
I have misplaced my OBD reader so can't easily check accelerator position sender, but car gradually gains speed.  Flat on hills. 

Does anyone know if it is possible to back-probe the turbo solenoid and measure the duty cycle? 
Any suggestions welcome. 

When I removed the under-shield something that looks like a hot water bottle stopper fell out. 
It doesn't have a thread, but must be a push fit into something.  What looks like a thread is actually a series of circular flaps.  Any body recognise it? 

Steve

Offline SirDavidAlhambra

  • Sir David Alhambra.
  • *
  • Posts: 829
  • Thanked: 19
  • Model: Alhambra Mk2 Auto
  • Spec: 2006 1.9 Tdi auto
  • First Name: Dave
  • Region: South East
  • Country: United Kingdom
Re: Loss of power and mystery object
« Reply #1 on: June 29, 2021, 11:20:39 PM »
Greetings, friend.

Tell us, if you give the car some welly does it belch black smoke out of the exhaust?

Thank you.
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

Offline johnnyroper

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  • Posts: 3207
  • Thanked: 166
  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
  • Region: South West
  • Country: United Kingdom
Re: Loss of power and mystery object
« Reply #2 on: June 30, 2021, 12:24:37 AM »
So the actuator travels when pumping does it start to move at 3-5hg vac and reach max travel at 17-19 hg vac?
Also when running on idle do you get full vac to vnt actuator and actuator pulls right up to max?

When you had vac pump out did you measure the vac thatís being produced by pump? You want upwards of 20hg.

Also worth unplugging maf and see if that improves things if vac testing checks out. Another possible is EGR stuck open,could try temp blanking egr pipe off.

As for that plug I have seen one before but cannot for life of me remember what it is for. Nothing critical though itís just a blank plug for a hole I suspect.

Offline slow-n-steady

  • *
  • Posts: 24
  • Thanked: 0
  • Model: Alhambra Mk1
  • Spec: 01 TDI 115 AUY+EHH
  • First Name: Steve
  • Region: South West
Re: Loss of power and mystery object
« Reply #3 on: June 30, 2021, 09:06:01 AM »
Sir DA
No black smoke. 

JR
Some time back the car went into limp mode and I discovered ruptured EGR and Anti-shudder diaphragms.  I blanked both vac pipes before starting anything else. 

Did you mean check the through-way is clear and temporarily blank off the exhaust recirc port? 

The MAF was replaced when I had a paper towel obstructing the intercooler inlet, but that is another long story.  Hope to goodness it hasn't failed as the original was PX for the new Bosch, so I can't even swap it out for the old one. 

I didn't check start and finish vacuum, nor max travel and full vacuum at tick-over, nor vac pump output but will check those now and come back. 

Away on holiday tomorrow so will be off line for some time after that. 

Thanks for the suggestions. 

Steve



Offline johnnyroper

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  • Posts: 3207
  • Thanked: 166
  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
  • Region: South West
  • Country: United Kingdom
Re: Loss of power and mystery object
« Reply #4 on: June 30, 2021, 11:03:44 AM »
In theory with blanked vac hoses the egr shouldnít have moved to enable it to stick open, but itís worth blanking the outlet on manifold or inlet to egr to test if nothing else obvious identifies itself.

As part of vac testing make sure there are no vac leaks in the system,if you have already blanked egr and anti shudder you could just go with simplified vac system and do away with everything except the n75. Just connect the vac outlet from pump to n75 making sure you fit the one way valve and then vac pipe from n75 to turbo. That takes everything else out of the system as it is no longer required anyway. The vac resavoir at front of engine is only really there to store vac for when testing with vcds with engine not running.

Offline slow-n-steady

  • *
  • Posts: 24
  • Thanked: 0
  • Model: Alhambra Mk1
  • Spec: 01 TDI 115 AUY+EHH
  • First Name: Steve
  • Region: South West
Re: Loss of power and mystery object
« Reply #5 on: June 30, 2021, 02:40:28 PM »
JR,
Actuator starts to move at 3", finishes at 16".  I pumped it back and forth many times (that is, more times than I have fingers on my feet.)  No feel/sign of sticking or jerky movement.  Of course with the engine off, you can hear the regular hiss of released air, rapid or slow. 
'T' fitted close to reservoir.  From zero at start rose very rapidly to 23"Hg, then slowly to 27"Hg.  Key off, kick to 22" but settles and stays 25". 
As car has recently done 500 miles at high speed I checked oil.  Found at bottom of hatching, filled to top of hatching.  No difference. 
'T' fitted at turbo actuator and plumbed to cab for road test. 
Idle 18", in gear, foot to floor 0", overrun 11.5", normal driving between 8" and 14". 
Lost vac entirely several times (limp?)  Key off for two minutes.  Back to normal. 
I can't tie the limp mode to any action like accelerating, overrun, changing gear (up or down) or hill climbing. 
I have to say, there was no obvious change in performance, limp home mode or not. 
Using daughters V70 for holiday.  Back to AUY on return. 
I'll follow your advice on the solenoid vac pipes when I get back. 
Thanks for all your help. 
Steve

Offline johnnyroper

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  • Posts: 3207
  • Thanked: 166
  • Model: Galaxy Mk2
  • Spec: 02 tdi 115 ghia
  • Region: South West
  • Country: United Kingdom
Re: Loss of power and mystery object
« Reply #6 on: June 30, 2021, 05:35:44 PM »
If itís gone in to limp mode it will log a fault code,vac at actuator will drop to 0 at times if max boost is reached and ECU is trying to control it. If no fault codes I would be inclined to do the direct vac hose set up and if still the same replace n75

Offline SirDavidAlhambra

  • Sir David Alhambra.
  • *
  • Posts: 829
  • Thanked: 19
  • Model: Alhambra Mk2 Auto
  • Spec: 2006 1.9 Tdi auto
  • First Name: Dave
  • Region: South East
  • Country: United Kingdom
Re: Loss of power and mystery object
« Reply #7 on: June 30, 2021, 06:02:08 PM »
What a tricky conundrum

Can we be sure it isn't just a duff turbo?

The mechanic at my garage says it sometimes helps to "think dumb" as he puts it. In other words, "oh turbo not working ---> replace turbo" type of approach with no sophistication or complexity in the thinking. It's worked for me many times!

But a turbo is of course a pricey thing so I can't imagine you want to replace that unless you're sure it's the problem.

Also it sounds like u r really technical so know what u r doing anyway.

Not sure if I have the expertise to help much on this one sadly but I will give it a good think because there has to be a solution out there, it is a machine after all not a scientific mystery
I drive a Seat Alhambra 1.9Tdi which has 115bhp and an automatic gearbox.

I am happy to help you with all your questions. I am not a qualified mechanic but seem to be better at fixing my car than even the most experienced garages.

I have lots of friends here and very much enjoy talking with you all.

Always remember, a motor car is a serious tool and should be treated with respect. Put your safety first, always.

 

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