Hey Guys,

Over the past few weeks my car has hit the 250K miles mark. Sadly, a problem has started to occur. I'm finding it very hard to explain what exactly happens. I've spend many hours searching through these forums in hope of someone with a similar problem and the closest i could come is this, and please ignore the other peoples chat, and read only what chappers849 has posted:

http://www.briskoda.net/forums/topic/108675-acceleration/page__hl__+acceleration#entry1401735

My own example:

If i'm driving on the motorway @ 70mph and put it into 4th gear and floors it, then, at some random rpm the car shortly stutters and looses a little power after which it regains everything and keeps accelerating like nothing happen. This not only happens on the motorway in 4th gear, but sometimes also happens in 3rd or 5th, whatever. It's just very noticeable under hard acceleration. It does happen under slow acceleration also, but it's very faint.

I'm not sure if i'm making any sense whatsoever, but I have a time at a friends garage and i would appreciate any comments in which i could bring to him as a help for locating the issue.

So far i'm thinking:

Disassemble / check every hose: turbo/air/etc for leaks of any kind.

Fuel filter

??

Injector wiring loom in cylinder head. This becomes intermittent giving a misfire.

rotodiesel.

Misfire + 1

So far it looks like you guys are correct. Thanks a lot for your time, it's very much appreciated. What would these forums do without roto? :-)

He is an asset, for sure!

My brother had exactly the same symptoms on his Ibiza 1.9 tdi, did a Group 13 (injector trims) log in VCDS and it showed that one injector was drifting.

Replaced the loom yesterday, issue resolved. Economy back to where it needed to be and no more stutter. These seem to fail every 120000 miles or so. Allow 1 hour for the change, cam cover off job, otherwise piece of cake.

Probably misfire as posted above, but a degraded MAF sensor can produce similar symptoms too, though usually smoother (not stutter, more like drifting power).

Little update: Friend took apart the cylinder head(?) and he showed me how the metal has started to get worn out. Looks terrible and i don't think the car will do much more than 6 months to a year. I guess it's had it's time soon, but i've decided to keep the chassis and get a new engine + gearbox when the old one gives up.

Dunno if this link works, but i made this public on facebook for everyone to see:

https://www.facebook.com/photo.php?v=4558871084372&set=vb.1069359347&type=3&theater

It works. Wow.

But it sounds like your camshaft is worn? Don't throw the engine away, the cam/tappet replacement is a relatively inexpensive job, maybe £400-500 including parts and labour.

Where would you buy the camshaft?

Update:

Wiring loom changed.

MAF sensor changed.

Result is now worse than before. The car stutters even more often.

Slight/hard acceleration gives "misfire" or stutter in any gear and RPM. There are absolutely NO fault codes what so ever in the computer. No warning lights or anything else indicating problems. No smoke compared to normal. No strange sounds or anything like that.

If someone have other ideas, please leave them here.

Will an old fuel filter give this kind of problem?

KM/L or MPG seems lower, but i'm pretty sure that's because of winter.

Well a good side effect of changing the wiring loom is that now my car starts every time without any cough/noises. MPG has also improved, it still stutters under acceleration though. I'm not sure what the problem could possible be.

Edited 16 December, 201213 yr by Cown

Update:

Fuel filter changed, problem solved.

And the moral of this story is:

Before changing expensive components, change the cheapest and most obvious first.

Well none of the changed parts went over £30 a piece. :-)