Very low compression within a couple of weeks?

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flanagaj
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Joined: Sat Apr 13, 2019 6:29 pm
Drives: MK6 1.2 (VAG BMD 3 Cylinder)
Location: United Kingdom

Very low compression within a couple of weeks?

Post by flanagaj »

Replaced the valves on my daughter's polo 5 months ago because of low compression and the car was then fine. 2 weeks ago my daughter reported that whilst driving along the car lost power, but then it came back (no engine light on) the other morning she reported that it took a long time to start and after it did it was running roughly and reporting a miss fire on cylinder 1. Compression readings are strange too. Cyl 1 reporting 50, but the other 2 cylinders are 150+ A wet compression test or cyl 1 was no different.

Anyone able to suggest what might have happened here.

Timing chain jump?
Valve burnt out / carbon build up?

Thanks
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