110bhp afn power loss?

[minty0_10]

my cars started losing power and seems to be getting worse i think its electrical.
when driving you can feel the boost drop off turning the key on and off brings back some of the power but not as it used to be.
some places where the car would pull 80 its now struggling to pull 40

ive changed the air flow meter for a genuine vw part but this made no difference and ive done a full service?
anyone with any ideas?

[immy69]

my cars started losing power and seems to be getting worse i think its electrical.
when driving you can feel the boost drop off turning the key on and off brings back some of the power but not as it used to be.
some places where the car would pull 80 its now struggling to pull 40

ive changed the air flow meter for a genuine vw part but this made no difference and ive done a full service?
anyone with any ideas?

I had the same problem, ended up being the wiring loom that feeds the injectors. Get a vag com done and if you get any code regarding injectors then thats what i'd change first.

[ini]

I would check the usual suspects:

Turbo VNT mechanism jammed/restricted/sooted up.

MAP sensor failing.

N75 valve failing, or vacuum leak.

Low pressure side air/boost leak (unmetered air).

Injection pump timing out.

Dirty/worn injectors.

Exhaust/CAT restrictions.

Mechanical wear, diff/bearings etc

[minty0_10]

this is the problem i had with my car after wasting my money on buying a new maf i fixed it for nothing!

on the back of the bulk head in front of where the battery fits there a small black thing with 2 or 3 small vacum pipes coming from it.
check the pipes are not split or lose, this is what was wrong with mine.

failing that it can be the part that the pipes fit into its only around £20 from the main dealers

[immy69]

this is the problem i had with my car after wasting my money on buying a new maf i fixed it for nothing!

on the back of the bulk head in front of where the battery fits there a small black thing with 2 or 3 small vacum pipes coming from it.
check the pipes are not split or lose, this is what was wrong with mine.

failing that it can be the part that the pipes fit into its only around £20 from the main dealers

I cant believe my cars gone funny again, flat spots between 2k and 3k revs, feels very sluggish, I have some oil at the back in the area mentioned by minty, so will check the hoses and failing that buy that part he is talking about, I believe its called the thrust sensor, hopefully somone can clear that up for me..

[tdi miki]

the hing he is talking about is vacuum spliter. all the vacuum lines are conected there. that is vacuum line for brake booster. ini wrote all the things that could be the problem. since you changed MAF sensor you should tahe a look at vacuum lines. If you can get your hans on vacuum meter you could check how much vacuum is there on turbo actuator when you start the engine. it should be from - 0.8 to -1 mbar. if that is ok than only thing left to check are the vanes on turbo and cat. and if you have vag-com things would be eaven easyer

[immy69]

the hing he is talking about is vacuum spliter. all the vacuum lines are conected there. that is vacuum line for brake booster. ini wrote all the things that could be the problem. since you changed MAF sensor you should tahe a look at vacuum lines. If you can get your hans on vacuum meter you could check how much vacuum is there on turbo actuator when you start the engine. it should be from - 0.8 to -1 mbar. if that is ok than only thing left to check are the vanes on turbo and cat. and if you have vag-com things would be eaven easyer

if it is these vacuum lines, will it show up on a vag com, is there any point in getting that check?? Only thing is, I aint a mechanic (or even close) so would have to take it to a garage for to have it looked at.

[ini]

If you have a PD engine, and the MAF is genuine and confirmed working ok, i would check the EGR valve, N75 valve (turbo vac control), and MAP (thrust) sensor first.

Flat spots are usually 90% MAF related.

[minty0_10]

afn is the older type engine pre pd, there shouldn't be any oil around the pipes that go to that vacuum spliter, only air go,s through them.
have a look its simple just check the little pipes are a tight fit there was a split in the end of one of mine.
the best way to describe the power lose i has was like a loss in torque i had to rev the engine higher to get anywhere

[immy69]

afn is the older type engine pre pd, there shouldn't be any oil around the pipes that go to that vacuum spliter, only air go,s through them.
have a look its simple just check the little pipes are a tight fit there was a split in the end of one of mine.
the best way to describe the power lose i has was like a loss in torque i had to rev the engine higher to get anywhere

oh sorry, I had no idea what afn was, mine is defo a PD engine, a late 51 model, so a little oil is nothing to worry about?
I had a little look over lunch, there is defo a hissing sound around the pipes at the back so thats the first place to look, will sort that, if I still have problems then the MAF sensor is next. I changed the coolent temp sensor, EGR valve and the wiring loom last time I had this problem, although perviously car would go into a safe mode after i lost power so this is a little different.
Many thanks everyone for your input so far!
I'll keep u posted.