Easy Fix For Limp Mode!

[adie_morris]

Hi all,

 

Thought I'd share a fix with you.

 

12 Months ago my Mk2 115 tdi developed the loss of power limp mode bug which is soooooo common on tdi's.

 

Like most people I suspected MAF first time, but with no fault codes I was not inclined to change it.

 

I then looked into VVT's or Variable Vane Turbos, which is what the PD engines have (mine).

 

Reading about how they work and matching my symptoms to the many short start stop journey's that we used to do, it became clear that the turbo vanes had become clogged.

 

Now there are some real good posts on how to dismantle and clean VVT's, but I wanted to leave that as a last resort.

 

I work in car parts and stumbled across some Wynns EGR Valve cleaner (available from Unipart) It's pretty potent stuff and it's in an aerosol.

 

You remove the air intake from the MAF sensor and spray down the intake (full instructions on can) You have to have someone to hold revs up for you whilst you do it & only do it in short spurts else engine will over rev.... big time!

 

It is also vital that you don't get any near the MAF or it will be history!

 

I was amazed at this little aerosol, because it cured mine instantly! More extreme cases may need another can or if really bad may not work at all.

 

But for the cost about

[Jayton]

How long ago did you do it and how long has it been since you had the dreaded limp mode?

[tim-spam]

My guess is that the problem will return when the weather gets colder and damper.

[Jayton]

I've not had it once yet since it's been so hot, maybe it's a good time to do the Italian tune-up eh? :)

[adie_morris]

Been fine for 2 years now, I too thought it would come back when it was colder, but didn't happen....... & I think the coldest winter in 30 years was a pretty good test!

It has also helped re-educating the wife's driving habits....... don't drive a TDi for economy, they don't like it! :)

[Jayton]

Ah, that's a good length of time to be sure :)

 

I might have to get some of that EGR cleaner as I'm servicing the old gal this week.

 

Out of interest, you say hold the revs, but at how many? 2k, 3k, 4k ? :)

 

and use the whole can?

[adie_morris]

Ah, that's a good length of time to be sure :)

 

I might have to get some of that EGR cleaner as I'm servicing the old gal this week.

 

Out of interest, you say hold the revs, but at how many? 2k, 3k, 4k ? :)

 

and use the whole can?

 

I can't remember the exact speed about 2.5k I think, but it tells you on the can & yes use full can.

 

Be interested to know how you get on, as I said before it does depend on how badly caked up your vanes are, but if your limp mode is intermittent, there is every chance it will do the trick. :D

 

Ade

[Jayton]

Might as well give it a try :)

 

Saves taking the EGR off and cleaning it and also

[twindecks]

i took mine of yesterday it were very bad easy to take of car runs like a dream Edited July 13, 2010 by twindecks

[big boy stevie]

this sounds like the trouble im having with mine exactly same symptoms, so i just ordered a can from ebay

[spongebob]

Having read loads of limp mode/sticking turbo posts, I thought I'd recount my experience with a product called Turbo Clean by Innotec. I bought and used this product just recently and followed the instructions to the letter. It cost over

[big boy stevie]

ive used wynns prouducts in the past and they have been very good, ive ordered it now just need to find out where to squirt the blood stuff is it take off airbox a and squirt down there or somewhere else.

 

steve

[big boy stevie]

can anybody point me in the right direction.

[marinabrid]

i used a similar product forgot what its called but cost

[big boy stevie]

nice one just waiting for my can to arive and i will do it thanks a lot.

 

steve

[Jayton]

Do you think having run my car on a mixture of diesel & petrol for 15 miles would have cleared it? Baring in mind I was giving it beans on the dual carriage ways because it felt a bit under powered :o :angry2:

[adie_morris]

Do you think having run my car on a mixture of diesel & petrol for 15 miles would have cleared it? Baring in mind I was giving it beans on the dual carriage ways because it felt a bit under powered :lol: :rolleyes:

In theory I suppose there would be less soot emmitted and gases would be a lot hotter with petrol.

Don't think it would have done injectors much good though :-(