I suggest you do not use Shell V-Power Nitro and just try to keep to Tesco Momentum 99.

Or other Super Unleaded fuels but they might be 97 ron.

Shell V-Power Nitro has additives,

as does Tesco Momentum 99.

Everyone with Rough Start up or a Failed engine when asked "do you use 98/99 ron fuel ?"

says,

'I have always used Shell V-Power'

Never heard anyone say, i only use Tesco Momentum , in those similar circumstances.

Plenty say, it runs better on Shell V-Power!

The fuel system does not need a clean,. possibly detergents with the like of Sodium in them. IMO.

Just Good Plugs and a good ECU update & good oil with the 98 ron fuel should work just fine.

http://www.tescopfs.com/our-fuel/specifications

Maybe someone can find the specifications of Shell V-Power Nitro & post it.

George - sorry, but I need to disagree - I've run mine for two and a half years on Shell V-Power / Nitro - I tried a few tanks of Momentum as an experiment but I'm now back to Shell as it definitely seems to prefer the Nitro. Nowt wrong with Momentum though.

Hundereds are running Shell V-Power Nitro in their 1.4 TSI Twinchargers.

Apparently problem free.

 

It is just an observation from me about asking those with Mis-fires and replacement engines,

& the reply they give,

'I always use Shell V-Power'.

 

So why should people not use it, its good for them, and they like how their car goes.

( i did not see the point of post  #7 and the advise of using Shell V-Power every 4 tanks because it has some Fuel System Cleaner that we are never told what it actually is.)

 

Never yet heard anyone with a Misfire or engine replaced say,

I always used Tesco Momentum,  but maybe they did not,

or just never answered.

 

george

People who report misfires and rough starts normally say they have been running with 95 fuel. I have run momentum and nitro and the differences are minimal. I feel the throttle pick up on Nitro is quicker plus I have a very good shell garage 30 seconds from my house so it's a no brainer for me. If Tesco was that close I would probably fill up there.

We go over this topic hundreds of times. It's a highly strung small capacity engine, give it good fuel. But most of all, never and I mean never take a Dealers word as gospel. When I bought my car I thought I would ask "what fuel do you put in, I've read this engine needs 98?" I already knew the answer but I was curious as to the answer. I was told "No just use normal 95"

Scary.

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The same as yours a slight erratic rocking sensation on cold idle when on choke on cold engine start. Lasts for about 20s and if you apply a little gas goes slicky smooth. But as its occasionally i wont do it on demand. Ive tried 4 tanks of momentum and still the same so back on v power. The dealer said that super unleaded will cause the pistons to burn out and it causes too much clogging up on the head. I thought this would be the opposite as it has cleaners in it. Any way he said one tank in 4 use regualer unleaded. If this is the case why would skoda recommend 98 ron.

Any ideas from anyone regarding this rocking sensation? The "master tech" at my local dealer didn't seem to have any idea. I was disappointed that their only course of action was to plug in and check for fault codes. There could be a lot more going on than the computer tells them. However unless you can demonstrate it to them they don't want to know.

Edited 3 May, 201412 yr by austenw90

Fault codes for the likes of a misfiring cylinder might well not show unless there are enough in one cycle,

Which is not going to happen in 1-2 minutes of starting up.

 

So drop the car off later on in the day and leave them to start it in the morning.

Thats what i got when it went in car. It was plugged in no faults codes and as the car does it occasionally they said they can only act once witnessed. So then the manager said about using 95 ron 1 in 4 tanks.......i wont be doing that. How bad is yours? Mines a very slight rocking sensation on cold start when idling as if on choke but its not done it for a couple of days now. As soon as you set off drive 10 yards stop ita gone silky smooth.

Hundereds are running Shell V-Power Nitro in their 1.4 TSI Twinchargers.

Apparently problem free.

 

It is just an observation from me about asking those with Mis-fires and replacement engines,

& the reply they give,

'I always use Shell V-Power'.

 

So why should people not use it, its good for them, and they like how their car goes.

( i did not see the point of post  #7 and the advise of using Shell V-Power every 4 tanks because it has some Fuel System Cleaner that we are never told what it actually is.)

 

Never yet heard anyone with a Misfire or engine replaced say,

I always used Tesco Momentum,  but maybe they did not,

or just never answered.

 

george

re post 7 and the comment above.

 

All fuel is created equal, but is then modified with additives at the distribution terminals.

 

Shell claim that V-Power contains extra detergents to help keep the fuel systems clean. Therefore, should you be running supermarket fuel which does not contain the same detergents, it may be a good idea to run a tank of V-Power through every so often or buy a can of fuel system cleaner and run that through every so often.

 

You are sadly mistaken if you believe that your fuel systems do not gradually collect pollutants that reduce the overall efficiency.

I stumbled on something this morning when starting from cold that got me thinking a i feel needs proving.

Now in the mornings i normally get in the car and put key straight in ignition and turn to start, rough idle as normal, I run Tesco momentum and shell v-power by the way. Now this morning i got in the car put key in ignition and only turned part way so the fuel pump cycle had finished, then fired the beast, smooth idle from the get go, now is this just coincidence or what? Could some other people try and report back. If the fuel drains back it could just be as silly as air in the fuel line.

So are you turning it to the point of the sweeping dials and leaving for a few secs or before you get to that point.

Have you noticed that you unlock the door, open it and got in the car,

no ignition on, the fuel pump has primed the petrol.

(you hear the pump)

 

Bubbles52,

you said every 4 th tank of Shell V-Power if using Tesco Momentum.

It is bought at Supermarket Filling Stations, & produced by Greenergy produced and imported,

just like Shell is Imported,

Greenergy & Shell share a facility to bring fuels into the UK.

http://en.wikipedia.org/wiki/Greenergy

 

So do we know the Additives/Detergents Shell add which are different from those Greenergy add.?

Do the 102 ron + Race & Motorsport Fuels available in the UK for a constant quality of fuel

get these same Additives ?

Do the 100-102 ron fuels available on Mainland Europe.

Twinchargers run very nicely on those fuels, and as for efficiency reduced,

spark plugs failing do that quicker in Twinchargers than any other factor.

So are you turning it to the point of the sweeping dials and leaving for a few secs or before you get to that point.

Turn key so dials sweep, i.e. Ignition fully on but car not started, you should hear the fuel pump purge, once that has stoped the fire the car up.

I wonder if we are beating the fuel pump purge and that why we get an initial rouugh idle, when car has sat for long periods of time like over night.

Yeah i ll try that, it makes sense to me if that solves the problem happy days.

I agree, unlocking and opening the door primes the fuel pump as you can hear it. But switching the ignition on you do hear another electronic pump sound. I always let the dials do their sweep. I have never had rough starting/idle apart from one time that I feel was related to leaving the car standing for a while and not letting the dials sweep!

Really it just relates to the engine not running right.

Loads over the past years have said theirs do it, its not a feature that the engines designers built into it.

 

You can jump in one, sit in one for aged, start it as soon as the key goes in the ignition and the engine should not be rough

or the engine rock.

 

Austenw90,

 did it do the same before the engine was replaced?

 

george

Have you noticed that you unlock the door, open it and got in the car,

no ignition on, the fuel pump has primed the petrol.

(you hear the pump)

 

Bubbles52,

you said every 4 th tank of Shell V-Power if using Tesco Momentum.

It is bought at Supermarket Filling Stations, & produced by Greenergy produced and imported,

just like Shell is Imported,

Greenergy & Shell share a facility to bring fuels into the UK.

http://en.wikipedia.org/wiki/Greenergy

 

So do we know the Additives/Detergents Shell add which are different from those Greenergy add.?

Do the 102 ron + Race & Motorsport Fuels available in the UK for a constant quality of fuel

get these same Additives ?

Do the 100-102 ron fuels available on Mainland Europe.

Twinchargers run very nicely on those fuels, and as for efficiency reduced,

spark plugs failing do that quicker in Twinchargers than any other factor.

 

The additives are added when the road tankers fill up at the fuel distribution terminal. Therefore each fuel company can send their own "flavour" to the filling station.

I never had it before new engine however I only had the car for about 2 months before new engine was installed. December and January.

Problem with leaving it with them is that it doesn't do it every time. I've noticed it about 5 times in the space of 4 weeks so very difficult to demonstrate.

Dealer maintains their position that they cannot act without demonstration. But seeing as it is a new thing since THEY installed the new engine you think they would do more ...

Problem seems to be, as others have said, that they really don't know these cars at all. Either that or Skoda employ monkeys (also been said).

Edited 4 May, 201412 yr by austenw90

that is 'the 3 monkeys',  

or just people called Tommy.

 

Customers are 'Mushrooms', kept in the dark

I pulled into the Shell in Towcester on Monday with a 350-mile trip home ahead of me - all the V-Power pumps were out of commission - I still had almost half a tank but rather than interrupt the journey on the M1 or M6 I topped up the tank with the cooking stuff - to be honest I never noticed any difference but then I was only chugging up the motorway at 70-odd mph (slightly faster on occasion...) - fuel consumption was noticeably better on the way home, but there were too many variables to put that down to the fuel.

Edited 11 May, 201610 yr by Brian69

I pulled into the Shell in Towcester on Monday with a 350-mile trip home ahead of me - all the V-Power pumps were out of commission - I still had almost half a tank but rather than interrupt the journey on the M1 or M6 I topped up the tank with the cooking stuff - to be honest I never noticed any difference but then I was only chugging up the motorway at 70-odd mph (slightly faster on occasion...) - fuel consumption was noticeably better on the way home, but there were too many variables to put that down to the fuel.

I guess if it was half and half its not a true test of 95 anyway.

Half 97 n half 95 will make it 96 wont it (:

Hi !

 

Concerning rough idle after coldstart (30sec), mine started again to have it, as described last year.

 

For me it ALWAYS happens when outside temp is between 16 and 28-30 degC. 

 

And again, IMHO it's lambda probe / cat heating strategies.

Ignition timing is really late (0CA instead of usual idle 18CA), and boost is built-up (2nd gear steady 15km/h + foot-off = PSSHHHH).

Which Country are you in, and what engine CAVE or CTHE.

 

Are you running the latest Skoda ECU Update?

Good Sparkplugs, maybe with a 0.7mm or even 0.6mm gap.

98 Super Unleaded fuel or better.

 

The standard Black Airbox does get very hot in high ambient temperatures & underbonnet heat, and on start up the ECU does seem to have a brain fart on some cars.

I'm in France, CAVE 2011, ECU should be with latest update according Skoda and I run 98 octane Total/Shell/BP only.

 

Spark plugs have 35000km (will be changed at 40k km for Denso) but I never had a missfire and no fault in ECU.

 

My rough running is clearly from ECU calibration (timing and boost messed-up), fast heating CAT for emissions tests ...

According to Skoda when was your ECU Updated,

where you in for a service or something in the past year?

 

Misfires only log if there are enough in a cycle.

The rough starting can be a different issue, and one spark plug can be a bit fouled. (sooted & oiled up.)

 

As well to put in the new DENSO Plugs early, and it is worth getting an ECU Update if there is one, 

and there is since Jan 2015.

Edited 12 May, 201610 yr by GoneOffSKi