Any ideas?

[mkovacs401]

I was driving home from Glasgow along the M8 last night coming off up the sliproad joining onto the bypass in 3rd gear I was gradually building up speed, it felt the car was holding back when the turbo would normally kick-in around 4 thousand rpm but instead it gave off a loud bang from the exhaust. Going up my gears it repeated. It didnt sound or feel normal at all so I slowly built up speed to get me home. Coming to the end of bypass I tried again to put the foot down in 6th gear this time.. the turbo kicked in but was really rough and the car was vibrating a little. On the smaller roads I tried a few pulls in 2nd 3rd and 4th but it didnt pull as hard as normal. I went out to look today everything looked ok but noticed a few pipes looked wet on drivers side under timing belt, i think. It sounded very rough when i first started her up, no lights came on the dash last night or again today. Just wondering if anyone had any ideas what may be wrong with her?

Car is a s3 8p manual quattro.
Stage 2
Mods are
Full tbe bcs powervalve with sports cat.
Dog bone mount.
Gfb dv+
Loba hpfp
Revo intake
Forge pcv delete

Cheers, Mike

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[-Ju-]

You may have a leak on the seals on the boost pipes looking at that but I just think you'll loose boost rather than run rough.
Have you tried unplugging the maf sensor and running it unplugged. If it runs better it's goosed

 

[mkovacs401]

Will try that on way home and see if it helps, thanks

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[mkovacs401]

Took the sensor off and its still the same, any other ideas

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[mkovacs401]

Had the car plugged into the computer today, its saying misfire cylinder 4. Changed the coil and spark plug but still no joy, so going to do a compression test soon and change injector. Hopefully she will be fixed soon

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