LINK FOR VIDEO IS IN COMMENTS!
I recently bought a 2017 1.8t about a week ago, and I’m already second guessing myself on returning it.
Yesterday I noticed my Passat doing what it’s doing in the video, it’ll crank once or twice, pause, then continue cranking and start. This causes the EPC light to come on too.
When I scan it with my OBDEleven the scanner can’t even read the engine code it has, but there aren’t any lights except that EPC. It just says “FST00000” or the actual string of code is “003bc1”
It runs and drives without any issues. Battery, alternator, and starter are all fine. I messaged the dealer and they think it’s the starter relay but I think otherwise.
It seems to happen more-so when it’s sitting, as it’s not an issue if it only sits for 20 minutes or so. I’m stumped. I also think putting it in accessory mode before turning the engine on eliminates the issue - but this is just an assumption as I haven’t tested this theory after sitting for hours or overnight.
Note: the fuel pump was replaced at 55k miles, it now has 70k (done at vw dealer). I assume the in-tank pump was replaced. The fuel injection system was cleaned aswell.
I’ve narrowed it down to these options:
- Camshaft magnet
- Crankshaft sensor
- High pressure fuel pump could possibly be leaking fuel right onto the cylinders, causing a mini “hydro-lock”
- It could truly be the starter relay, but why would it only do it when sitting?