Reply With QuoteI cant understand that their design would allow for this much carbon build up. Surely as part of normal service, a regular clean through intake manifold should help this problem (like Subaru's upper enginer cleaner).
Dub Crazy
Yep
That's worthy of rectification.
carandimage The place where Off-Topic is On-Topic
I used to think I was anal-retentive until I started getting involved in car forums
Volkswagen Fan
I cant understand that their design would allow for this much carbon build up. Surely as part of normal service, a regular clean through intake manifold should help this problem (like Subaru's upper enginer cleaner).
Dub Crazy
I'm convinced that VW/Audi/Skoda don't really care about the longevity or service costs of their product beyond the average ownership period for new car buyers and attempt to keep service costs in the first 3 yrs of ownership artificially low by stretchin service periods to a maximum.
carandimage The place where Off-Topic is On-Topic
I used to think I was anal-retentive until I started getting involved in car forums
Volkswagen Fan
Update -
I manually cleaned the valves. Hesitation is still there although not as abrupt.
Things that have been replaced / cleaned so far.
PCV
Spark plugs
Coil Packs
Intake valves manually cleaned
Not sure what else it could be, maybe just a characteristic of the engine.
I did read on an american forum that the intake runner flappy motor (vacuum driven) can get a bit worn and so doesn't turn the flaps as efficiently when the engine gets older.
If anyone has any further advice / comments please respond.
Cheers
Wayne
New Dubber
Dirty injectors?
Volkswagen Fan
Checked the injectors - they were all good
So annoying as it doesn't show a code at all, but there are a small amount of random misfires at times of acceleration around where it seems the flaps are doing their thing.
Dub Crazy
What happens when you tie the flaps open with a cable tie?
carandimage The place where Off-Topic is On-Topic
I used to think I was anal-retentive until I started getting involved in car forums
Volkswagen Fan
That is what I am going to try next
Volkswagen Fan
I've got the same issue with hesitation on a 125TSi but I'm running an APR stage 1 tune. Very noticeable in 3rd gear under heavy acceleration. I've had all the usual service things done, plus had it re-flashed and looked at by APR nobody can find the issue. At about 90,000kms I changed the intake manifold because the arm on the side which controlled the flaps kept popping off (some clip broke). This also didn't resolve the issue.
However running stock, I cannot get any hesitation so would be interested to see what resolves this.
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