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So my uncle collected my car from the garage on Tuesday and as I work away, the first time I drove it was yesterday. The car doesn’t seem right. There’s slight vibration when idle when parked on a downwards incline and also when I start up the car, both on cold and warm start up the RPM...

Thanks for the tip. I’ll start using super unleaded too.

It’s an exhaust valve. I’ve asked if they know what’s caused it and if there’s anything I can do to prevent it happening again in the future and they’ve said it’s just one of those things and nothing I can to prevent it.

Normal unleaded from the local shell garage. What usually causes burnt valves?

Just an update in case anyone else encounters this issue. I took the car to a German car specialist garage. Turns out I have a burnt valve. All in all it’s costing £1450 to repair the car which also includes a timing belt replacement, water pump replacement and a full service. I knew I was due a...

I’ve left the car overnight for the engine to cool down to see if the steel seal would fix the problem. Misfiring is still present but not as bad as before. Can’t get the car back in the garage till next Thursday now.

The misfire seems to have improved. Barely noticeable when driving at low revs. Before it was extremely noticeable when going up a hill or low revs going around the roundabout. Misfire is still very noticeable when idle.

Compression tester arrived. Cylinders 1-3 have a compression of 175 psi, cylinder 4 is 40 psi. When the compression tester was used in the cylinder 4, water was found on the end of the tester. Right now we suspect water problems in cylinder4. We’ve just put some steel seal into the radiator and...

The local garage fit new spark plugs on Monday. Since then the car has been driven 3 miles to my friends dads house who is a retired mechanic. As you can see in the pic, plugs 1,2&3 look like they’ve been firing whereas number 4 looks untouched. The ignition coil for number 4 was also damaged...

What kind of cost am I looking at for those, excluding labour?

The local garage has done a compression test. Sorry should have mentioned in the original post. They said the first time they tested cylinder 4 the compression was low and the second time it was significantly lower and that cylinder 2 was also low.

Strange that you should say electrical. The AA also said it was an electrical issue. However, the guy in the local garage said it was definitely mechanical. But as far as I know, all he did was plug the diagnostics computer in and change the spark plugs. The AA swapped the coils over and the...

I’m not sure if it’s COD. I’m going to call Audi customer services today and see if they have any idea.

I believe the AA checked the coil packs when they came out. They switched the coils over and the problem always remained on cylinder 4. Cylinder 2 didn’t come up as a fault when it first broke down. It’s only since it was in the garage that, cylinder 2 is now misfiring

I really hope someone here can help me! I was driving up the motorway over the weekend and noticed a loss in power. The local garage has ran diagnostics which has said cylinder 2&4 misfire. Copy of the report is attached. Car is misfiring constantly at low revs and speed (I.e idle and pulling...