I've had a quick read on other hesitation/surge problems and mine sounds different so thought I'd bung up a post.

I seem to get an occasional surge in acceleration, usually in 5th when overtaking on a dual carriageway. If I'm travelling at 60-70mph and move out to overtake a lorry and put my foot down the car starts to accelerate. Then (and it usually seems to happen just as I'm letting off the throttle) I seem to get a sudden surge of acceleration. I don't have a boost gauge fitted so I don't know if it's boost related or not. Think I may fit one though to see if it helps pin point it.

Anyone got any idea what's causing this?

**EDIT** It's on an Octy vRS by the way.

I get it also. I think its just the delay in the boost in the system getting round from when you take your foot off and the ecu reacting

Hope thats helps in some way, lol.

Garry

I used to get exactly what you have described! Finally someone else! Thought I was mental.

It felt like full throttle wasn't actually when you had your foot to the floor, but when you slightly lift off it. Really weird, and not very useful when you want to lift off to slow down when coming up quick behind slow traffic!

I don't think it happens any more though. The only thing I can think of that might have stopped it would be when I gave the throttle body a good clean before Christmas. I can't think of a time when it's happened since.

Maybe give it a bash, only takes 30mins if your being careful.

Yeah, I'd been thinking about giving the throttle body a clean as the cars done 96k so it's probably a bit manky in there! It doesn't do it all the time so it's difficult to know what's causing it. I was thinking of something along the lines of the wastegate wedging open and giving only small amounts of boost and then freeing up and allowing boost up to normal levels, but I'll try giving the TB a clean and see if that helps. Is there a "How to" on here? Just carb cleaner to clean?

Mine does this now and then.

Doesn't show anything odd on the boost gauge so I don't worry about it, seems too happen at lower speed/revs. If i back off "a bit higher" up the dials it dosen't seem too do it.

MMMMmmm. Might give mine a good clean then also

Garry

Is there a "How to" on here? Just carb cleaner to clean?

You'll need carb cleaner, a screwdriver, a sock, a new gasket (£4 from the dealer), a hex key and some cloths and cotton wool buds

Undo the hose clip holding the boost hose to the throttle. pull the hose off and cover the end with a sock to stop you dropping anything down it. Undo the four hex-head bolts holding the throttle body to the inlet manifold and ease it off, removing the old gasket. Don't unplug the plug on the throttle body because if you do this you will need to re-set the throttle afterwards.

Give the throttle body a good clean with carb cleaner and cloths, also get a helper to hold down the accelerator with the key in the ignition (turned to first position) so you can clean round the throttle butterfly with a cotton wool bud. In true Haynes manual style re-fitting is reversal of removal, using the new gasket. Re-connect the hose and make sure the hose clip is nice and tight.

(I did take a load of pictures last time I did it so I should really get round to putting them in the Tech Guides section...)

Edited 7 May, 200917 yr by chicken_eyebrow

I finally got my a$$ in gear and did a proper guide with pictures

http://briskoda.net/technical-guides/cleaning-throttle-body-1-8t-engine/145866/#post1699003