1.4L tsi Misfire

[DapperH45]

1.4L tsi (czca) Engine Misfire!!!

Hi guys, I own a seat leon mk3.5 at 72k mileage and I have an engine misfire on all 4 cylinders. Symptoms include cold start misfire, rough idling, decreased fuel economy only during local driving and low rpm engine misfire (mainly between 1k - 2k rpm). I would not say poor acceleration but during the low rpm it does take a few seconds before the engine kicks in.

So far I have replaced all 4 spark plugs, all 4 ignition coils, replaced pcv and completed a smoke test (no obvious leak). Based on the symptoms and what I have already replaced any ideas what it could be? I was leaning more towards HPFP or maybe the timing is off?

Any help would be appreciated.

 

[SRGTD]

The symptoms you describe are often associated with carbon build up. More of an issue with direct injection engines, and the AI response to an internet search on your engine code suggests the engine in your car does have direct injection.

Just my ‘armchair diagnosis’ (a.k.a. guess) and other forum members might have different suggestions on the cause(s) of your misfire issue.

 

[nd-photo.nl]

@DapperH45 What mileage are we talking about here?

 

[SRGTD]

@DapperH45 What mileage are we talking about here?

The OP mentioned in their post that the car’s on 72k miles.