Can someone explain why my 1.6tdi Greenline pinks just above tickover when under load? 

 

It drives normally, and boosts normally after several applications of Archoil 6400d and size 11's but this one aspect remains. 

As far as I'm aware, only petrol engines "pink" (pre-ignition).  So what exactly are you describing ?

Exhaust manifold leak?

Is your aircon not functioning at present?

1 hour ago, J.R. said:

Is your aircon not functioning at present?

 

I think it's working ok. I don't use it much. 

2 hours ago, Austin 7 said:

As far as I'm aware, only petrol engines "pink" (pre-ignition).  So what exactly are you describing ?

 

That nasty diesel rattle that some engines produce at low revs, low load - next door's old van does it, the D4D Yaris in the family also does it.

Never had a VAG tdi make this horrible noise before. 

1 hour ago, weasley said:

Exhaust manifold leak?

 

I was thinking it was a turbo vanes, or fuel pump issue but that's interesting. Thanks I'll have a look. 

 

How long has it been "pinking"?
Have you had the cam belt changed when it started?

 

My now gone Yeti always knocked under load until the engine had warmed up.  About 1.5 miles into my morning journey I had to pull out uphill onto a busy road and if I had to give it a few revs it knocked. To warm up usually took 5 miles and that is exactly how far work was from home.

I got around the problem by cycling to work.

 

Colin

21 hours ago, Urrell said:

How long has it been "pinking"?
Have you had the cam belt changed when it started?

 

 Cambelt was changed 4 years ago according to the paperwork, I've noticed it since I have been doing more local driving - trickling through town, and when pulling out of junctions (not grand prix stuff) the revs will hunt down to tickover and even below and that's when I notice it. 

Injector rattle

13 hours ago, b1ackb1rd said:

 the revs will hunt down to tickover and even below and that's when I notice it. 

That sounds ominous

had similar, vcds indicated a valve on the front of the engine was stuck, can't find the message, but a light tap with a screwdriver seems to have cured it, i didnt have a rattle though, just the hunting!

36 minutes ago, Frenchtone said:

had similar, vcds indicated a valve on the front of the engine was stuck, can't find the message, but a light tap with a screwdriver seems to have cured it, i didnt have a rattle though, just the hunting!

 

There might be something in this, when ignition is turned off there are a series of blow off noises. 

 

Do you mean the valve that sits to the right of the ASV as you look at the engine? It has a small white/grey disc on the top. 

 

When looking at the engine with cover on, LHS exposed, I tapped that and then tapped the round piece partly covered on the RHS. Problem seemed to happen on cold mornings etc, as above no probs now!

On my MK2 Octavia the engine cover had an plastic insert which had the fake bulges supposedly covering intake tracts and maybe a Skoda badge, I cant recall, it was so the same basic engine cover could be used on many different models just by changing the insert.

 

It clipped into place but would rattle at certain resonant frequencies, I removed it, added a bead of sealant and clipped it back in place and it was silent thereafter.

34 minutes ago, J.R. said:

On my MK2 Octavia the engine cover had an plastic insert which had the fake bulges supposedly covering intake tracts and maybe a Skoda badge, I cant recall, it was so the same basic engine cover could be used on many different models just by changing the insert.

 

It clipped into place but would rattle at certain resonant frequencies, I removed it, added a bead of sealant and clipped it back in place and it was silent thereafter.

 

Yes mine rattles like mad as it only has 2 bungs in it! (£8 each on eBay)

I did think of this but the noise changes and goes when the revs rise, this is more reminiscent of the racket nasty old french diesels used to make in the mornings - but without the smoke, and it happens even when the car is warmed up. 

Discussed this with a mechanic friend the other day, and the subject moved to the myriad of sensors that have such an effect on performance/fuel economy etc - he then suggested I look at the o2 sensor that sits by the DPF as he had cured strange running issues by 'resetting' the sensor?

 

This is beyond me, anyone have any thoughts? 

8 letters, starts with B, end with T

To be honest I have had some pretty strange errors over the years with VAG diesels, and some strange cures (brake switch for a flashing glow plug!)  and I'll check anything once!

 

My 1.6tdi is now showing a flashing glow plug about 10 seconds after starting from cold, but boosts as normal !

 

If anyone wants to check their o2 sensor (not had time to do mine yet) 

 

 

9 hours ago, b1ackb1rd said:

I have had some pretty strange errors over the years with VAG diesels, and some strange cures (brake switch for a flashing glow plug!)

I had an engine fault light up, it was no3 glow plug but no glow plug fault light!

I had a desiel Golf 1600 withe the same pinking noise which turned out to be leaking injectors (oil level was going up as well)