HPFP failed

[cmdrfire]

What mileage you got on yours mate? Mines in with a similar issue except it only does it under light loads, not heavy and I'm crossing my fingers its not a damaged camshaft and follower. 
 

110k miles mate.

Just out of interest did you renew the follower?

Nope, follower still looked in as-new condition (!). Must be down to the very early-build AXX components I suspect.

^^^^
Glad to hear it's all resolved, Neo      [Have you now got time to progress the LED project?]

Does anyone know if the OEM fuel pump has ever been revised by VW?

I'll see if I can get a move on with the LEDs now Robin! Far too much work on as usual though 

Glad everything's been resolved. Nothing worse than chasing a fault! Thankfully, after i changed my spark plugs my problem hasn't returned,. However, everytime i put it under load im still expecting it to misfire. Didn't think it would be as simple as spark plugs. Only time will tell!!

I have that fear of a misfire still but I did a hard pull in third today all the way from 1800RPM to redline and it felt good to be able to do that again without a stutter or a miss. Idle is all smooth now as well, used to be a bit lumpy, and I've noticed more smoothness under light to medium loads especially in the lower gears. Really has made a huge difference 
Hopefully it's just the sparkies on yours, as I said I changed my plugs and coils and that didn't make any difference, hopefully was just a fouled plug in your case 

[Boothy]

What mileage you got on yours mate? Mines in with a similar issue except it only does it under light loads, not heavy and I'm crossing my fingers its not a damaged camshaft and follower. 
 

110k miles mate.

Just out of interest did you renew the follower?

Nope, follower still looked in as-new condition (!). Must be down to the very early-build AXX components I suspect.

^^^^
Glad to hear it's all resolved, Neo      [Have you now got time to progress the LED project?]

Does anyone know if the OEM fuel pump has ever been revised by VW?

I'll see if I can get a move on with the LEDs now Robin! Far too much work on as usual though 

Glad everything's been resolved. Nothing worse than chasing a fault! Thankfully, after i changed my spark plugs my problem hasn't returned,. However, everytime i put it under load im still expecting it to misfire. Didn't think it would be as simple as spark plugs. Only time will tell!!

I have that fear of a misfire still but I did a hard pull in third today all the way from 1800RPM to redline and it felt good to be able to do that again without a stutter or a miss. Idle is all smooth now as well, used to be a bit lumpy, and I've noticed more smoothness under light to medium loads especially in the lower gears. Really has made a huge difference 
Hopefully it's just the sparkies on yours, as I said I changed my plugs and coils and that didn't make any difference, hopefully was just a fouled plug in your case 

....and its still the original cam follower!? This whole cam/cam follower has me well boggled innit. Speak to one person and they say the AXX engines have chocolate camshafts and are prone to the follower wearing and then another person says the exact opposite?  

[alexperkins]

AXX engines... if they have a one part camshaft are made of chocolate and should be replaced (under VW warranty as it was a recall as such) for a two part camshaft

[cmdrfire]

@Boothy, it's still the original follower.

AXX engines... if they have a one part camshaft are made of chocolate and should be replaced (under VW warranty as it was a recall as such) for a two part camshaft

...I had heard that the AXX engines had the two part shaft from the factory? Might be wrong, but was just what I heard (hence why the issue manifested on BYP/other engines prior to AXX blocks)


In any case my follower/lobe/etc all look nominal... JKM inspection @90k (they said "like new") and the most recent incident @110k.

[alexperkins]

Some early AXXs still had the earlier BYP etc single part camshaft due to crossover etc

[Boothy]

AXX engines... if they have a one part camshaft are made of chocolate and should be replaced (under VW warranty as it was a recall as such) for a two part camshaft

I have spoke to the VW technical department after seeing theVW bulletin about the cam follower. They told me that no recalls had been issued on any of the parts connected to it and didn't even know there was a one piece and two piece cam 

[alexperkins]

Typical VW lol

[Boothy]

Typical VW lol

Are you sure the choco camshaft  was recalled?

[cmdrfire]

Some early AXXs still had the earlier BYP etc single part camshaft due to crossover etc

AXX block was earlier than the BYP block I thought?

Certainly my car which is one of the earliest Mk5 GTI built came with AXX block and only the later cars came with BYP/BWA blocks etc which had the camshaft issue.

My understanding was (and I could be completely wrong so forgive me) that the very early blocks had the two piece shaft; this was replaced with the single piece shaft that was prone to failure; and the two piece was reintroduced as a TSB on the later engines?

@Boothy, don't think it was a recall, but it was a TSB at least in the US.

[Boothy]

Damm! I wanted it to be a recall 

[alexperkins]

Some early AXX still had the earlier BPY etc single part camshaft due to crossover etc

BPY was after AXX sorry typed it the wrong way around!

[cmdrfire]

Some early AXX still had the earlier BPY etc single part camshaft due to crossover etc

BPY was after AXX sorry typed it the wrong way around!

Ah fair 'nuff. VW's always done a bit of mix and match anyway...

Hans, ve haff run out of ze part! Zere is no more in the bin!
Ja, iz okey Fritz, just be usink zis one!

[martziniuk]

So do you know what part failed on the pump?
I'm sure many of us have Stripped these pumps down to replace internals but to me the only seal which would cause any trouble is the piston seal. Maybe the pump was blocked with crud, mine had quite a bit in @ 100k?

[cmdrfire]

Not sure, I'll open mine up when I get it back on Monday (VW have kept it for a quick looksee of their own). Certainly I'm happy now with the added overhead of the APR unit.