I'm running a mk2 vrs. A few months back had lumpy idling, horrible jumps etc through revs at low acceleration. Fault code appeared but no dash lights. Skoda found a loose vacuum hose, cleared the fault. Perfect. Also changed the plug's.. Although..

After a boot full every now & again, come to a stop.. a little lump on idle. So can you recommend or even use a carbon cleaner additive or fuel system cleaner or is that what Shell V-Power is designed to do? Cars running fantastic but Just a little niggle... any advice is appreciated.

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Just do not do it.

 

Try Tesco Momentum 99.

 

What spark plugs are in at what gap?

 

What mileage on your CAVE engine, and has it had a Software Update, ?

maybe consider that, do not use Additives or Carbon Cleaners.

 

?

What fault codes. 

Mis-fires, Fuel Pressure ?

If that was because the Vacuum hose was off, then thats that sorted is it not?

 

 

A new Fuel Filter might be an idea.

The biggest problem with these engines are the carbon deposits on the intake valves, they look horrendous from as early as 40K. It will eventually get to the point where you need to take the cylinder head off and do a thorough cleaning of everything.

 

The photo shows just how bad they look on a 60K km car that redlines quite often actually.

 

There is a nice product from Tunap that you spray directly into the intake hose iirc and helps with those deposits but it's only effective if you're doing it from the beginning of the life of the car and on a regular basis of 8-10K.

Whos valves.  

& having been run with what oil and what fuel and with what map on what engine.

Was that your engine at only 37,000 miles ?

 

We have pictures of 1.4 TSI CAVE engines with valves burnt out, especially 2010/11 built engines.

But that still does not lead one to believe that there is a need for using a carbon cleaner.

Unfortunately there is indeed such a need after some mileage. Don't know the owner in person but it's a 2011 CAVE, no idea about what oil and fuel he's been using but given that he's tuned the car and generally taken good care of it I assume they are not relevant. I've seen similar pictures from others that have had the engine opened either for uprated pistons and rods or just rebuilding due to high mileage and they are more or less the same. It is not something you easily notice until it becomes much worse.

 

Mines looked almost like that photo when I saw them last week, more on that later...

The plugs are BKR7EIX set at the gap they came out the box.

P0106 was the fault code, cleared it's self & Skoda but the hose back on and it's fine.

27250 is the milage. The last software update was when the gearbox recall got done around 8/9 months ago IIRC.

I got told the fuel filter was a life time filter by Skoda so didn't replace that.

The only reason I ask is because I just want to look after the car & engine the best way I can and thought it could be a possibility of cleaning the internals

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2011 CAVE engine too by the way..

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But that still does not lead one to believe that there is a need for using a carbon cleaner.

 

 

Unfortunately there is indeed such a need after some mileage. 

 

 

Sorry I didn't mean to say there is a need to use a carbon cleaner after some mileage cos then it will be useless. It's either use it from day one or just don't do anything and wait until the problem is evident and you simply open and clean everything in there / rebuild it. I'm also going for that second option. But what I'm saying is it's sure that there's going to be a need to deal with deposits. It's not so common yet as not many people have done great mileage with their vRS.

The plugs are BKR7EIX set at the gap they came out the box.

P0106 was the fault code, cleared it's self & Skoda but the hose back on and it's fine.

27250 is the milage. The last software update was when the gearbox recall got done around 8/9 months ago IIRC.

I got told the fuel filter was a life time filter by Skoda so didn't replace that.

The only reason I ask is because I just want to look after the car & engine the best way I can and thought it could be a possibility of cleaning the internals

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The above comments of mine being true, I don't think 27250 is such a  high mileage to cause the issues you've been having. Maybe need to look elsewhere.

The above comments of mine being true, I don't think 27250 is such a high mileage to cause the issues you've been having. Maybe need to look elsewhere.

Thanks for your input mate. I'll just keep a close eye on things as I have been doing. You here so many horror stories, the slightest little thing bothers me sometimes.

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The DSG service campaign software update is not the same as the Software Update that is available for the Twinchargers ECU. So has the engine software had an update?

As to those spark plugs. Some have had them last less than 7,000 miles. And leaving the gap as it is might be OK. As long as you check what the gap is and that they are all the same.

You can buy a new Fuel filter and replace it. As to lifetime

That might be their working lifetime advising customers and getting it wrong.

Unsure of the engine software update so will give Skoda a call to make sure. I'll check the spark plugs again to make sure they're ok too.

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Unfortunately there is indeed such a need after some mileage. Don't know the owner in person but it's a 2011 CAVE, no idea about what oil and fuel he's been using but given that he's tuned the car and generally taken good care of it I assume they are not relevant. I've seen similar pictures from others that have had the engine opened either for uprated pistons and rods or just rebuilding due to high mileage and they are more or less the same. It is not something you easily notice until it becomes much worse.

Mines looked almost like that photo when I saw them last week, more on that later...

Interested to hear more about that!

Interested to hear more about that!

 

Tried getting a photo of the valves but the damn camera just wouldn't focus properly so they all ended up too dark and got deleted.

 

Let's just say you should be careful when using a torque wrench at the lowest part of its range (ie: don't use it there) or ugly things can happen...

I had that Terraclean treatment on my car a while ago, stuff like that is designed to help clear out deposits isn't it?

I had that Terraclean treatment on my car a while ago, stuff like that is designed to help clear out deposits isn't it?

I've heard so yes. Did you see or feel a noticeable difference?

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KarlvRS1991

 

You seem intent on using an additive/cleaner regardless of the advise given in this thread (or do I do you an injustice? - if so I am sorry)

 

Many claims are made by chemical companies, but a magical improvement in mpg, or an amazing increase in BHP etc are things of fiction in real everyday terms.

The fact that you have/are about to pay out money conditions you to before in advance that all will improve!

 

Let me make a point here (a genuine one).

I am of an age when I recall the appearance of the first Crypton machines. My garage had one, so I (with others) went to the Bridgwater Crypton depot for training. The public soon became aware of this 'amazing scientific equipment' - and we were inundated by customers who wished to get the benefits of a Crypton tune.

 

In fact, its core use basically gave a realtime readout of Plug voltage draw (Kv)

Gave a figure of the realtime dwell angle in the points setting of the distributor

Had a timing light.

This meant that we could judge wether

1 - the s/plugs were 'good' or 'bad'

2 - The points gap provided the right dwell angle (recommended nominal gap did not guarantee the correct dwell angle) Only when this was 'corrected' could we then move on to the strobe timing light with a degree of accuracy.

 

We did many tune ups, and many cars were already well within correct parameters, but when customers collected their cars they were amazed that it was so much faster, quieter, more economical etc etc, and said it was money well spent.

Obviously there were genuine cases where a badly set up car did benefit from a tune.

Customers were allowed to wander into workshops in that day and age - and they were totally begiled by the sight of a Crypton screen with all its data glowing away + plus of course all the connected leads. I hope you see what I am getting at here, and will not take offence.

If you look online, you will see that some of the 'specialist' cleaner centres have a number of problems, and a number of dissatisfied customers

KarlvRS1991

You seem intent on using an additive/cleaner regardless of the advise given in this thread (or do I do you an injustice? - if so I am sorry)

Many claims are made by chemical companies, but a magical improvement in mpg, or an amazing increase in BHP etc are things of fiction in real everyday terms.

The fact that you have/are about to pay out money conditions you to before in advance that all will improve!

Let me make a point here (a genuine one).

I am of an age when I recall the appearance of the first Crypton machines. My garage had one, so I (with others) went to the Bridgwater Crypton depot for training. The public soon became aware of this 'amazing scientific equipment' - and we were inundated by customers who wished to get the benefits of a Crypton tune.

In fact, its core use basically gave a realtime readout of Plug voltage draw (Kv)

Gave a figure of the realtime dwell angle in the points setting of the distributor

Had a timing light.

This meant that we could judge wether

1 - the s/plugs were 'good' or 'bad'

2 - The points gap provided the right dwell angle (recommended nominal gap did not guarantee the correct dwell angle) Only when this was 'corrected' could we then move on to the strobe timing light with a degree of accuracy.

We did many tune ups, and many cars were already well within correct parameters, but when customers collected their cars they were amazed that it was so much faster, quieter, more economical etc etc, and said it was money well spent.

Obviously there were genuine cases where a badly set up car did benefit from a tune.

Customers were allowed to wander into workshops in that day and age - and they were totally begiled by the sight of a Crypton screen with all its data glowing away + plus of course all the connected leads. I hope you see what I am getting at here, and will not take offence.

If you look online, you will see that some of the 'specialist' cleaner centres have a number of problems, and a number of dissatisfied customers

Thanks for the info. Not intent as such. Just curious more than anything as there seems to be alot on the market & I just want to keep the engine performing and running at its best.

If running correct fuel, keep on top of servicing & plugs etc Is the case then I'm happy.

All the info is this thread has been helpful to my question regardless so thanks guys.

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Edited 28 October, 201510 yr by KarlvRS1991

I've heard so yes. Did you see or feel a noticeable difference?

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Errrm I think there was a slight increase in MPG but my engine had only done around 40,000miles at the time, I think treatments like those are best on older engines as you'll probably notice more difference.

I'd like to see the internals of the engine actually, see if they are a bit clogged up and if a good manual clean would help at all.

In the seventies my father had so many fuel saving devices on his car that he had to stop every 30 miles and let a gallon out!!!