DaniP

Car has been returned 😁 Root caused was tracked back to the crankshaft pulley (which I've also seen referred to as the harmonic balancer) being in the wrong position which was causing juddering and vibration. Exact same issue that Twiz had with their car in this post: https://www.briskoda.net/forums/topic/506382-12-tsi-running-rough-after-cambelt-change I've driven it a bit and sat it in neutral and ran through the revs and I can't pick up on any juddering or roughness now so I am satisfied that it is fixed @MB21 in relation to the really slight vibration that you can detect at 1200rpm still - I can detect something at that rev point too but like you it's exceptionally subtle and I don't think I would have noticed it were it not for the fact that after having this issue I'm hyper sensitive to anything relating to vibration or changes in engine noise. It's something that I am happy to put down to "that's just what the engine sounds like" and leave it at that though Fingers crossed for smooth driving for some time now!

@MB21 From what I've been told by the garage, they've tried new coil packs and spark plugs so I can only assume they swapped out all of them - they said it made no difference I'm expecting an update either today or tomorrow so I will let you know what they find. I need to press them for a bit more information because I'm not clear if they're definitely seeing misfires (which would send them down one route of investigation) or if it's something vibrating in/around the engine which would send them down a different route, like checking engine mounts and the like Hoping for positive news soon, I've been without a car for nearly a week now which I am not loving!

No fix for mine yet but here's what I've been told by my garage so far: - Diagnostics have come back with no faults or errors - Timing has been checked and it is all perfect - Initially I was told that one of my spark plug pins was slightly bent but in a follow up update I was then told that it wasn't in the correct position(?) and that was then resolved which made no difference - They then swapped out the coil pack and spark plugs with a different car and that made no difference either They do acknowledge that the judder/roughness is there So it's still with them, and I will hopefully get a further update tomorrow or Friday when they've had time to look at it some more @MB21 how has your car been feeling after getting your work done?

@MB21 I can say with a fair degree of certainty that my garage probably won't be as reasonable with the pricing! So long as it gets fixed though that's the most important thing - I'll definitely keep you updated

Thanks so much for the update @MB21! Really glad to hear that things are if not 100% fixed than significantly improved. Is there any theory/explanation around how/why the coil pack issue could have happened or become obvious post cam belt change? Is it just a bizarre coincidence? I'll be sure to share all this info with my garage when it goes in next week and I'll update with how it gets on and what they find

@MB21For reference, this is the parts list that was included in my paperwork from the garage - be interesting to see if our parts list matches

Really sorry to hear that they are no further forward @MB21 I'm trying to find the similarities/differences between the work done on my car and the work done on yours so we can try and narrow it down - do you know if your garage used genuine Skoda parts for the cam belt and what the part numbers are? If we are both genuine Skoda parts/same part numbers then it's maybe a duff batch of parts that we have both been hit with? I'm presuming that they are also following the Skoda issued guide/instructions for the work? Wonder if there's an error in the instructions? (Seems a bit unlikely but you never know...)

@MB21 how did your Fabia get on at the garage today, did your guys manage to find anything/fix the problem?

Hi @MB21 Mine's not booked in until the 23rd so no updates on my front I'm afraid Appreciate that @toot's questions were directed to you but in the interest of sharing info: - My car has done 22,000 miles, and I've had every service done at my main Skoda dealer where I bought the car from and have had whatever's recommended done at each service interval - My cam belt was done at the same time as my 5 year service and MOT, where I also had brake fluid change, coolant change, air-con service - my spark plugs were replaced last year - Car got the usual Skoda health check done at the same time as the service and everything was marked as green aside from a corroded exhaust clamp which I had replaced at the same time as all the other work Given that the car was running perfect prior to the service, MOT and cambelt and immediately had noticeable vibration at 1200 revs (and I think it's vibrating between 1000 and 2000 revs but it's much more subtle than what happens at 1200 revs!) post the work, my immediate thoughts are that there must be something slightly off on the timing per @ApertureS's comments or generally related to the cambelt change so it's interesting that your garage thinks it's not that. I was discussing the issue with some of my work colleagues who work on their own cars and their opinion (for what it's worth) is that it definitely sounds like the timing is off and that if the timing is only off by a few degrees then it wouldn't necessarily show up in a diagnostic or trigger the EML to come on. Best guess is that my car has done about 90 miles since the work was done and at this time it hasn't gotten any better or worse and the EML hasn't come on Seems extraordinarily unlikely that three of us with the same engine have all encountered an identical issue post a cambelt change and it's related to something other than the cambelt change.... Please keep us posted with what your garage is able to find and (fingers crossed!) how they fix the issue so I can pass the info on to my garage when I take mine in!

@ForCar40 have you made any progress with this? I have almost exactly the same issue - my 2018 1.0 TSI Colour Edition has about 22000 miles on it and was in last week for a cam belt replacement and now the engine is really rough and lumpy at 1200rpm. I've got it booked back in with the garage to get it looked at but I'm worried they're going to fob me off. @ApertureS /anyone if the timing is off by a couple of degrees, would that show up in diagnostics? What's my best course of action to make sure they properly look at and adjust the timing other than just insisting?