VW Scirocco 2.0 TSI Misfire

[Char787]

Hi All,

I have a misfiring scirocco 2.0 tsi DSG 2010.

I have replaced all the spark plugs, coil packs and most recently a leaky fuel injector which we thought was the problem.

However driving home again that fateful engine light flashed back on after a little misfiring judder.

It did not go into limp mode this time and the light flashed 4/5 times before driving normally again.
This occurred the first time it happened- it has a cylinder shut down function which is what has seemed to kick in again this time. The few times before this last time it has gone into full limp mode and then not starting what so ever and needing recovering to my garage.

What are my next steps as the garage and myself are left scratching our heads??
Thanks

[catso]

Carbon buildup on the intakes & intake valves?

Quite common on many GDI engines, having no fuel through the intakes to keep it clean.

[thebraketester]

You need to get it scanned to see what its doing and why its throwing the EML.... that would be my first port of call.

[Char787]

Each scan it has always says misfire in cylinder- has been in 1/3/4- firstly we switched round coil packs to test but each time gave a different cylinder hense the change of coil packs and also spark plugs! When went again found leak in fuel injector to cylinder 1 so changed that.

Getting scanned again the morning will have to report back with what it says

Thanks

[thebraketester]

Is the engine standard? Its odd to get misfires on multiple cylinders on these engines.

[Char787]

Yes standard 2.0 TSI DSG-

Ironically bought one for its reliability and unfortently nothing but trouble! When it’s going good, it’s a dream!

Have noticed some slight juddering in low gear/low rpm but seems to have stopped after last visit to garage

Will get them to check for carbon build up tomorrow

[cuprabob]

Might be worth getting the garage to check the correlation between the camshaft sensors and the crankshaft sensors to rule out chain stretch. Also, the chain tensioner on early models is problematic therefore it will also confirm the chain hasn't jumped a tooth.

When you replaced the coilpacks, did you buy OEM Bosch ones?

[thebraketester]

Char787 said:

Yes standard 2.0 TSI DSG-

Ironically bought one for its reliability and unfortently nothing but trouble! When it’s going good, it’s a dream!

Have noticed some slight juddering in low gear/low rpm but seems to have stopped after last visit to garage

Will get them to check for carbon build up tomorrow

IME carbon build up is unlikely to cause the issues you are having.

[giveitfish]

I had similar symptoms on mine a couple of years ago - was a fault with the intake manifold. Some plastic has broken inside. Was a few hundred to replace IIRC.

https://shopdap.com/blog/intake-manifold-failure-o...

[catso]

thebraketester said:

IME carbon build up is unlikely to cause the issues you are having.

Maybe not? but it can cause misfires under heavy load due to not allowing enough air to flow and upsetting the mixture.

I have recently had a misfire followed by cylinder disabling twice on my S4, both times under the same conditions (same section of road actually) and whilst I don't know if it was caused by carbon buildup (I'd like to think not at 22k miles), my research shows that it is a known problem.

For now I have replaced the coilpack (same cylinder both times on mine) as that is a far easier job than de-carbonising, so far so good but I'm keeping my fingers crossed...

[D'oh]

Hi

This is currently happening on my 2.0TSI. It is intermittent and usually happens under heavy load and mostly when the engine isnt up to temp.
I wouldnt imagine it is due to carbon buildup though in my case , as the engine is less than 10k due to it being replaced after a tensioner failure!!!

The misfire happened this morning after running fine for two weeks without issue.

[Char787]

D'oh said:

Hi

This is currently happening on my 2.0TSI. It is intermittent and usually happens under heavy load and mostly when the engine isnt up to temp.
I wouldnt imagine it is due to carbon buildup though in my case , as the engine is less than 10k due to it being replaced after a tensioner failure!!!

The misfire happened this morning after running fine for two weeks without issue.

mine can be fine for months and then will go- has gone under load and also gone at under 3K rpm whilst off the throttle so can vary

I will see what code mine throws up this time and let you know for your garage to check

[thebraketester]

catso said:

thebraketester said:

IME carbon build up is unlikely to cause the issues you are having.

Maybe not? but it can cause misfires under heavy load due to not allowing enough air to flow and upsetting the mixture.

I have seen load of TSI/TFSI engines that are really bad with carbon build up and none of them cause EML. I am not saying that cleaning the inlets/valves doesn't help free the engine up, but its unlikely to be the cause of the OPs issues

[giveitfish]

I'll just post one more time as everyone is focused on carbon build up.

If the code is P2015 and the symptoms include any of rough running, "stutter", loss of power etc then it's worth a look at the manifold.

[cuprabob]

giveitfish said:

I'll just post one more time as everyone is focused on carbon build up.

If the code is P2015 and the symptoms include any of rough running, "stutter", loss of power etc then it's worth a look at the manifold.

Good point as this is a very common issue. Some people have even managed to get VW to pick up the tab out of warranty as it's a known design issue.

[Char787]

UPDATE

Garage have plugged it in and taken for test drive. drove fine and no sign of issues

was just giving misfire in cylinder 3 when plugged in to computer but nothing else.

said the manifold is a couple hours work to check it out?

read some people mentioning fuel cam follower on these common to going? could this be causing a misfire?

[thebraketester]

Char787 said:

UPDATE

Garage have plugged it in and taken for test drive. drove fine and no sign of issues

was just giving misfire in cylinder 3 when plugged in to computer but nothing else.

said the manifold is a couple hours work to check it out?

read some people mentioning fuel cam follower on these common to going? could this be causing a misfire?

I presume yours is a TSI, which is not effected by the cam follower issue as is the TFSI.

[Char787]

Car back and as suspected driving perfectly fine after codes cleared(although I have not and will not be going over 3k RPM)

nothing was done to fix the problem so it is going to go again at some point.

now I don't think my garage has the official VAGCOM computer.
I have called my local VW dealer and it is £80 per hour for them to look at it.

will their computer bring anything different up when they plug it in again once the fault comes back??

I went to a local "VW specialist" before and he said yes seen these loads of time, change the coil pack and it wont be a problem
I am not 4 misfires down the line from him so i feel my only option is back to a dealer.

is this going to be a waste of money and are they going to go any deeper into the problem?

[thebraketester]

Yes. They should tell you exactly whats up (unless they are useless).

[Pistonheader101]

£20 vcds clone cable will tell help. Alternatively have a look round on gumtree ebay etc -people will scan your fault codes for £20.

My intake manifold went on mine - p2015 if i remember correctly, cost £160 for the part and £80 for labour.