UNFIXABLE FAULT UNLESS YOU'RE THE YODA OF SKODA's ??

[GirlInNeed]

Hello,

Please can somebody help me:

I recently purchased a Skoda Octavia 2010 1.6 TDI Estate, 140K, FSH, it’s had a new turbo fitted, EGR valve and a DPF clean before I purchased it, with receipts for all this work. After owning the car for about 3 months one day it wouldn’t rev above 2500 rpm so it went to the local garage (VGA specialist) who can’t find the fault, there is no error codes, no engine management light on, however they have found that if you drive the car to say 30 mph turn the ignition off / on i.e. bump the car, the car runs perfectly until you turn the car off and you have to go through the same process each time you restart the car.

Many thanks

[bspman]

Was it a private sale or from a dealer?

[FatblokeVRS]

Doesn't the car detect if it's not moving and only rev to 2500 revs?? Maybe nothing to do with it but the only thing I can think of that limits revs to that.

They may need to log what the ECU is doing to see if it points to anything.

It's a difficult one.

[bspman]

@FatblokeVRS from the wording looks like the issues are safe-mode related (restart whilst rolling results in the car being ok), but I would expect 2.5-3k rev limiter at idle.

 

@GirlInNeed please clarify if this is at idle or whilst normally driving. 

 

 

it sounds like you need to get some logging done whilst driving (boost - expected vs actual)

I've had NO EML come on until hitting the boost  issues a few times in my mk1 and my dad's sharan.

Have a look here: and see if you can get someone with VCDS to help you log:

 

 

[GirlInNeed]

It was a private sale

[dg360]

How old is the battery?  Could it be sagging a bit low turning over and causing weirdness on startup?  Then when you turn it off and back on again with the effective bump - there is no starter sag and the alternator is producing plenty of juice to keep everything happy so it starts without limp home mode.

 

*utter shot in the dark.

[GirlInNeed]

Just to reiterate the car will rev to less than 3K rpm whether being driven or just revved.  Also although I didn’t completely understand what the guy in the garage said it was related to the traction control button, something like if you start the car switch on traction control, turn off the engine start it back up and switch traction control back on or maybe on/off, the car would rev freely and drives fine until you turn it off again.  I'm not 100% sure of the combination of the turning ignition on/off, in conjunction with the traction control button but it did work he showed me several times and drove perfectly up until the point I turn the car off.  I've just found it easier to drive the car, get to third gear, turn the ignition off/on and the cars fine.

 

Either of these two options will make the car run as it should.  I've even tried parking at the top of a hill turned the car off and free wheeled down and bump started it, that doesn't work either I still had to turn it off/on to make it work, tried this to see if the problem only occured using the starter motor to start it but it doesn't.

 

I know its long winded but trying to explain it as best I can.  I know this is a head scratcher but I'm hoping someone else has come across this issue before.

[bigjohn]

 

Probably not - but worth checking your brake light switch 

 

 

[robt100]

Sounds like some kind of speed sensor fault. Car wont go past that if its in neutral at 0mph. Or if the TC is active (which I believe uses the speed sensors/abs sensors) it does the same, might be an odd fault there somewhere. Probably worth getting it on VCDS and taking it for a spin.

[Guest]

In going to go out on a limb and say it's a vacuum leak somewhere, probably at turbo, else the turbo/egr is sticking.

[KenONeill]

@GirlInNeed Engage the steering lock with the car moving you must not!

 

More seriously, I'd suspect the speed sensor, but that needs a VCDS guru to (dis)prove. Otherwise, I've had my mk1 TDi110 for over 12 years, and used the traction control "in anger" a single figure number of times.

[dg360]

Agree with all of the above, get it on VCDS whilst recreating the issue.