Hope someone can help as running out of options.

Have a sporadic misfire and engine light code, mostly on motorway, misfire is not severe and can accelerate through it.

Autoexposure electrician says all electrics are good and everything operating within normal parameters so that rules out plugs, coil packs, sensors. Had garage take of inlet manifold (pain in ass job!) and there was only minimal sooting and injectors clean so that's not the issue.

Have put fuel cleaner through system (Sea Foam SF16) twice and no change.

They said it's either ECU playing up (new ECU😢) or leak somewhere and have therefore suggested I start with getting a smoke test done which won't be cheap.

Any advice appreciated

Hello, welcome to the forum.

Is a misfire code being logged on the ECU?

Has replacing the plugs or coil packs been tried?

Unless they were tested under load on a dyno, it would be unlikely to be able to produce the same conditions that trigger the misfire.

Hi

Yes miscode logged on ECU. Auto electrician did some live testing and assured me spark plugs (changed 20k miles ago) and coil packs ok.

Now got a P0106 Intake manifold 'absolute' code and loud intake sound bit like air con on full so think garage have created an air leak whilst putting air intake back on car 🥴🥴

If it is a Mk2 Fabia vRS 1.4 TSI Twincharger it matters not if spark plugs were changed 20,000 miles ago.

Get them out and inspect them..

1 might be burning the tip off.

Pinned thread at top of page. and so many many threads on the spark plugs.

You can not rule out the plugs unless all 4 were out and inspected.

?

What age of car and how many miles / km done?

EDIT.

I see a 2014 so a CTHE.

Important to put info like that in your post / question.

Edited 13 April, 20251 yr by Ootohere

Many thanks I'll get them inspected, or I assume enough for me to do assuming I buy the correct spark plug tool.... only ever taken them out of a carb engine 😂😂

Ignition coil puller required. You can make a home made. Or red neck cable ties. Best use the correct tool.

Will the Auto Electrician not let you use his 'Puller'.

All the tools and more than just an idea. Helps diagnose issues, not just the computer says no.

http://briskoda.net/forums/topic/446996-coilpack-remover=mk2-vrs

Do you run the car on E5 Super Unleaded?

Edited 13 April, 20251 yr by Ootohere

Thanks I'll get the garage Rob services the car to pull the plus and yes only ever E5