Hey All,

 

I've been searching a lot but I can't seem to find any answers for the MK3.

 

I have a 2014 51,000 mile car which has just had it's 6 year service.

 

I've had the car for around a year (bought from my dad) and it's always been my daily car, so I've generally just driven it for MPG. Recently I used it for a wet handling tyre test, and noticed when it's warm the engine gets really flat between ~3500 and ~4500 rpm at full load. Now I know it's there, it's easy to spot on the road from 3rd gear onwards.

 

No fault codes, full service history, generally been driven super softly etc. All I can find online is cleaning the TB, but that was for a MK1 with the 1.8!

 

Thanks in advance.

You stated that the car had been serviced.  Was this done by an official Skoda dealer?  Did you last have a major or minor service? Poor performance or flatspots could be caused by a number of things, but if the car is not showing any errors on VCDS, then I would be looking at personally inspecting all of the filters at this point.  Especially the air-filter.  Is the car smoking under heavy acceleration? The other thing that you mentioned which is that the car has been driven very carefully in your time whilst you had it.  As much as it might pain you, you will need to give the car a good long, fast run occasionally - keep the car in a lower gear / higher revs.  The car should also be running on decent branded fuel with fuel adatives (no supermarket fuels) - you might want to consider a tank of super-unleaded.

 

So - check the following:

 

1) Fuel filter

2) Air Filter

3) Spark plugs (they should be decent iridiums - and if not change them to decent iridiums) - check the colour of the plug.  If it is black and sooty, the car is running rich, if it is ice-white, your car is running too lean.  Check the gap.

 

 

 

Doesn't that engine have a dual injection system, direct and port injection?

I'm happy to be corrected but I thought the direct injection operates during low revs and idle and the port injection contributes during larger throttle and higher revs. Maybe the port injection has got a bit blocked through lack of use?

Edited 14 August, 20205 yr by Gerrycan

Just wondering whether the spark plugs have been replaced recently and gapped properly.

1 hour ago, varaderoguy said:

You stated that the car had been serviced.  Was this done by an official Skoda dealer?  Did you last have a major or minor service? Poor performance or flatspots could be caused by a number of things, but if the car is not showing any errors on VCDS, then I would be looking at personally inspecting all of the filters at this point.  Especially the air-filter.  Is the car smoking under heavy acceleration? The other thing that you mentioned which is that the car has been driven very carefully in your time whilst you had it.  As much as it might pain you, you will need to give the car a good long, fast run occasionally - keep the car in a lower gear / higher revs.  The car should also be running on decent branded fuel with fuel adatives (no supermarket fuels) - you might want to consider a tank of super-unleaded.

 

So - check the following:

 

1) Fuel filter

2) Air Filter

3) Spark plugs (they should be decent iridiums - and if not change them to decent iridiums) - check the colour of the plug.  If it is black and sooty, the car is running rich, if it is ice-white, your car is running too lean.  Check the gap.

 

 

 

 

Thank you for the reply! All servicing has been done on the yearly schedule by a skoda dealer. The most recent service included the air filter, and I've definitely tried the Italian tune up method  I'm not sure it'll be the fuel filter as it's flowing fine at high RPM but I'll see when that was last done, and obviously the oil filter was just changed.

 

The plugs would have been done in line with the yearly service interval on that car, so at the 4th year or 40,000 miles I believe. Again, these will have been done by skoda.

 

1 hour ago, Gerrycan said:

Doesn't that engine have a dual injection system, direct and port injection?

I'm happy to be corrected but I thought the direct injection operates during low revs and idle and the port injection contributes during larger throttle and higher revs. Maybe the port injection has got a bit blocked through lack of use?

 

Interesting theory, I'll follow it up!

 

1 hour ago, shyVRS245 said:

Just wondering whether the spark plugs have been replaced recently and gapped properly.

 

See above  

 

Thanks again all

 

Just to be clear, it's not a missfire and I'm not sure the average driver would notice the flat spot, but it's definitely there and worse when warm.

Tell a lie, there was one fault. "P1899 Coolant shut off value short circuit to ground / open circuit. Fault store in ECU (static)"

 

I need to clear it and see if it comes back.

My guess would be the fuel pressure regulator valve. Used to happen on the early TFSi engines. Happened on mine and back then we fitted one from the RS3 which held higher pressure.

Thanks for the idea, I'll check it out. If I can work out how.