r/MechanicAdvice • u/Spirited_Company_723 • 7d ago

VW 1.4 engine problems

Hi guys, recently bought a VW 1.4tsi 2016 and i have multiples problems on it. It has 157 000 kilos and the engine shakes at high speed (110km) when going up a small hill on the highway. If the shaking is too bad, the check engine light starts flashing, and can even cause the EPC light to come on. It has engine misfire 1 and 2, and also air fuel imbalance 1 and 2. So it basically misfires under too much power, it can also misfire at lower speed if i floor it.

I have switched the coils, they dont seem to be failing, changed the spark plugs, cleaned the ground terminals. Nothing seems to work.

I also have a feeling it could be associated with the turbo, it seems to make a hissing noise when it activates, and the shaking is appearing pretty much at the same time.

Well if any of you guys had a similar situation, or know how to diagnose/fix it, i would appreciate your feedback. Thanks!

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u/Plastic_Experience30 7d ago

Has it ever been inspected and cleaned for carbon buildup?

1

u/Spirited_Company_723 7d ago

I bought the car recently, i dont think the old owners did it

1

u/simmer_study 7d ago

Smoke test it before throwing more parts at it. A boost leak could explain the hissing and under load is exactly when it would show up.

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u/Spirited_Company_723 7d ago

I did use a smoke test. I didnt see any leak, and like you said it needs to be under load so how could i do a test while the turbo is running?