AMF TDi 75 2002 no boost, no codes

If its not smoking then the turbo should be okay, mine made a siren noise before it died. I didn't use lots of oil or smoke much though
 
Quick chat with Stealth, they are suggesting turbo failure.


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Ahh, OK. Sorry about that news. I got mine from turbonsolutions for decent price exchange and its been good so far. šŸ‘Œ
 
Iā€™ll pop the hose tomorrow to take a look, but barring broken charge pipes, I canā€™t see what else it would be.

Thereā€™s no vacuum of any substance in the hose going up to the N75 so to my mind that means the turbo isnā€™t.
 
The N75 hoses are pressure hoses not vacuum. The turbo pressure is in the green line, the N75 then rapidly dumps or sends that pressure down to the wastegate to control the turbo boost. The third line being the pressure release line.

Diagram of vacuum hose connections
Vehicles with engine code letters AMF
a2-2736.png

1 - Variable intake manifold flap change-over valve -N239-
2 - Exhaust gas recirculation valve -N18-
3 - Solenoid valve for charge pressure control -N75-
4 - Connecting piece
5 - To brake servo
6 - Non-return valve
7 - Vacuum unit for charge pressure control
8 - Turbocharger
9 - Charge air cooler
10 - Intake manifold
11 - Tandem pump
q For fuel and vacuum supply
12 - Cylinder head
13 - Vacuum unit for intake manifold flap
14 - Mechanical exhaust gas recirculation valve
q Is combined with intake manifold connection
q Can only be renewed together with intake manifold connection
15 - Air mass meter -G70-
 
Thanks Audifan, spot on. I blame clumsy thumbs and too much commiserative Leffe!

Basically there is weak pulsed pressure in the line.
 
Still not convinced it is turbo failure. A TINY leak will make the N75 system fail, the N75 valve itself could be faulty.

Have a read of this SSP

www.vdveer-engineering.nl

SSP 223 The 1.2l and 1.4l TDI engines

vd Veer engineering car electronics. Haldex, DSG, CAN controller and other CANBUS devices.
www.vdveer-engineering.nl www.vdveer-engineering.nl
 
Running the engine and even driving the car without the charge pipes might possibly have caused the turbine to overspeed (without the expected counterload) and get damaged, hence my question earlier if it is free to spin. Just my thoughts which you of course should not consider if you have more likely ideas.
 
Right so now Iā€™m properly flummoxed.

Iā€™ve taken all the charge hoses off, checked them over, pressure tested and no leaks.

The turbo itself spins freely and thereā€™s no discernible end float.

The wastegate operates easily on airline pressure.

All of the vacuum hoses have been replaced as per this diagram.

IMG_7117.jpg


Iā€™ve pressure tested the intercooler, canā€™t see or hear any leaks.

Iā€™ve replaced the three solenoids with known good replacements.

Now theyā€™re mooing at me, great.

Iā€™ve re-fitted the original EGR, then back to the replacement one.

Still no boost, still no codes.

Iā€™m done, Iā€™ve spent 4 full days on this, itā€™s going to the professionals next week.
 
Bloody eck, this is mad!! OK well done to you sir for tenacity. You MUST report back the cause as this is the worst case I've seen. I wonder if the waster gate isn't closing? Anyway we're done. Good luck
 
Thanks Crispy.

Iā€™m not a newbie to mechanical issues - I rebuild and restore motorbikes, including Italians ā€¦

But this one has me beat. And to cap it all, pulling in from the last unsuccessful test drive the car spat an 01435 ABS code at me.

Spiteful.
 
Thought has just dawned on me, I would strongly suggest you check the air filter, is it upside down??
Edit
Maybe it can't be upside down but I still feel here lies your problem, could anything be restricting air flow since you changed it? Known loose parts of gloves to cause chaos!
 
nin said:
Right so now Iā€™m properly flummoxed.

Iā€™ve taken all the charge hoses off, checked them over, pressure tested and no leaks.

The turbo itself spins freely and thereā€™s no discernible end float.

The wastegate operates easily on airline pressure.

All of the vacuum hoses have been replaced as per this diagram.

View attachment 112602

Iā€™ve pressure tested the intercooler, canā€™t see or hear any leaks.

Iā€™ve replaced the three solenoids with known good replacements.

Now theyā€™re mooing at me, great.

Iā€™ve re-fitted the original EGR, then back to the replacement one.

Still no boost, still no codes.

Iā€™m done, Iā€™ve spent 4 full days on this, itā€™s going to the professionals next week.
Click to expand...
I still see this as a faulty waste gate although it opens is it air tight when closed as symptom
still indicates a leaking waste gate
IE: non airtight seal & no boost pressure.
Itā€™s a simple flat sealing surface & only needs a bit of carbon/crud under there to prevent it sealing.
Also you wonā€™t hear or see it as itā€™s inside the exhaust manifold.
Hope that helps
Keith.
 
kp 115 said:
I still see this as a faulty waste gate although it opens is it air tight when closed as symptom
still indicates a leaking waste gate
IE: non airtight seal & no boost pressure.
Itā€™s a simple flat sealing surface & only needs a bit of carbon/crud under there to prevent it sealing.
Also you wonā€™t hear or see it as itā€™s inside the exhaust manifold.
Hope that helps
Keith.
Click to expand...

I think youā€™re right Keith. Iā€™ve worked the wastegate multiple times with the air line - and sprayed liberally with anti-seize fluid.

But when I stick it on the VCDS ā€˜basic settingsā€™ module 11 test cycle, the actuator doesnā€™t move - not even a tremor.

So to my mind thereā€™s no pressure going to the N75 valve, so it can open and close as much as it likes (and I can feel it doing so), but the turbo never gets started.

My problem is that I have no more time to allocate, so need to get this sorted in the next week or so.

And if the garage are going to take the old one off, I may as well stick a new Garrett in there.

Letā€™s see what they say.


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Itā€™ll probably be ā€œMr Hughes, youā€™ve used the wrong kind of silicon hoseā€ or summat.
 
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