Hi, 

 

I have a 2013 Petrol 1.2 TSI Octavia, it's currently just under 70k miles, and had a full service back in April or May.

 

For about the past 2 months, since I've been doing more motorway driving after starting a new job,  I've noticed on several occasions that when I go over like 75mph that it feels as if the brakes are being softly pressed and the car will slow down by approx 10mph to 65mph for eg.  There is NO warning light that comes up on the dash.  It then speeds back up again. Ive noticed it tends to happen more when it's either rained or is raining?

 

Father in laws mechanic friend asked when the fuel filter was last changed,  but after some research I'm under the impression that it isn't possible to change on tsi engines? If that is correct? I've put a bottle of redex in, which doesn't seem to of done anything.   I did wonder if it was from using e10 fuel,  so I've tried e5 fuel but it is still happening.   

 

Any thoughts what might be causing this problem? 

Depending on the car, spec and year you might have the speed limiter enabled for cruise control which would slow you down and stop you going any faster.

 

If it's a fuel supply problem, then it will throw a code. Can you get a scan by by (genuine VCDS) or ODBeleven please and see if there is a fuel supply problem or other issue.

 

PS... don't use E10 on the 1.2tsi engines. It's gives massive performance drops (IMHO and experience) plus it rots everything in sight.

Edited 22 November, 20241 yr by varaderoguy