Limp mode leon tdi 110 Diagnostics

[Mobo]

My leon went into limp mode for the first time today but was fine once i turned the car off and back on.
My turbo hasnt been sounding quite right so could it be to do with that.
If i got it diagnostics would it show why it went to limp mode

 

[sssstew]

possibly, so yeah start with a check for fault codes logged and search for them/post them up. Then move onto doing some logging for boost requested vs actual i would.

 

[Mobo]

had it checked out today and it came up with 17965 charge pressure control pressure deviation p1557
got to do some looking into that

 

[Bondiblu]

Sounds like VNT sticking, maybe faulty N75

 

[Mobo]

how can i check or is it a matter of change and see if it sorts out the problem

 

[sssstew]

yep agreed most likely sticky vanes on the turbo, drop it off and clean up the turbo, or use something like innotec.

http://wiki.ross-tech.com/wiki/index.php/17965/P1557/005463

 

[allh2k]

Had limp mode from sticky vanes from 80,000-130,000 changed the egr for an allard and it slowly got better now at 140,000 and doesn't happen

It taught me to drive slower haha

 

[allh2k]

Sorry this thread is about diagnostics

You run a few test with VAG COM (£10 eBay cable and a laptop with freeware VCSD lite)

You can log the following which also cause limp mode or can be the cause of sticky vanes (I think)

The MAF
The MAP
The EGR
Turn down the egr (might need to buy for £62)

And lots of other things can be checked/monitored not just a fault code scan.

 

[allh2k]

And the temp sensor but this is more to do with mpg

 

[Bondiblu]

Have a read through this...

http://www.myturbodiesel.com/1000q/a4/VNT-wastegate-adjust.htm

 

[Mobo]

Will the ebay cable work with the full version of vcds as i want to sort out a few problems with my windows and lite version doesnt support it

Also took it up same hill today and no limp mode

 

[Seatmann]

What's the problem with the windows and is your limp mode sorted yet?

 

[Mobo]

nothing wrong with the windows but i would like them to open with with key
Dont think the limp mode is sorted but its at a very early stage to becoming a issue

 

[Seatmann]

You need a serial vagcom cable and vds pro to enable the remote windows. You run it in ms dos mode and change 3 lines of coding in the ccm. I got this cable, works perfect

http://www.ebay.co.uk/itm/160814574702?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

and vds pro is all over the net

 

[Mobo]

Driveing around yesterday it went into limp mode again. had it put on diagnostics and same fault.
also the turbo was making a funny noise after i cleared the fault but went back to normal

Was going to order that cable but its finished. WIll this one work
http://www.ebay.co.uk/itm/OBD2-16Pi...iagnostic_Tools_Equipment&hash=item27bc5db09f.
and if you could pm me to a link for vcds pro as most places will prob have viruses.
thanks

 

[Mobo]

Fault might have been sorted.
I was able to clean the acurator vanes and the car feels more powerful then before and hasnt gone into limp mode. Tested it out on the motorway.

 

[allh2k]

How did you clean them?

 

[Mobo]

If you undo the loosen the pipe going from bottom of egr to top of turbo area and stick a small pipe down there such as washer jet pipeing and use that to spray some mr muscle oven cleaner untill it foams up.

Then remove pipes and run for a few seconds so the mr muscle can get into the acurators.
Spray more muscle into pipe and work acurator from the outside.
repeat untill it moves freely.

there are other methods but this seems the best one if you dont want to go under the car.

there is a thread on it on one of the forums and its about 38 pages long with various methods.

 

[allh2k]

Do you not have to worry about that method going back up the mani thro the value into the chamber?

 

[Seatmann]

That wouldn't happen but I'd be concerned about the stuff eating the alloy, I'd prefer to rinse it out if possible.