Volkswagen Eos Forum banner

1 - 17 of 17 Posts

·
Registered
Joined
·
13 Posts
Discussion Starter #1
Hello,
I have a 2008 EOS FSI 2.0 Turbo. The car is rattling everytime I start in the morning or leaving it for couple of hours. I checked below and they are all looks good:

1- High pressure fuel pump. I opened it and find it fine, lubricated, and no sign or damage, it looks shiny and new.
2- Removed the tensioner and the chain cover on the driver side of the engine. The tensioner plastic is NOT broken and the tensioner was moving normally and the belt was not loosy.
3- Removed Oil solenoid, it looks clean and no dirt on it.
4- Car has new oil and filter, and I am sure previous owners maybe never changed oil.
5- Removed Timing belt cover and the belt looks good to me and the rattling sound does not seem to be from the timing belt side.
6- Removed engine cover, and nothing weird noticed there.


Couple more things I read here and there which they are : 1- Transmission FlyWheel and Oil hose lifter in the Oil pane might be dirty.

1- I do not know how to inspect Transmission FlyWheel.
2- If the Oil hose is dirty, I assume the engine light or maybe Oil pump light will come up.

I appriciate if you guys could help me with finding the cause of this sound.

Note: Please do not add TSI or any other type of engine issue on this post, this is FSI engine. Also, lets have this post for future reference for whoever will have this problem in future.


Thanks,
Pkaka
 

·
Registered
Joined
·
1,467 Posts
The DMF noise is a heavy knocking noise, it may do it all the time or it may only doit when the starter engages but without hearing it in the flesh it is going to be just guess work IMHO. My advice would be to find a good Indy specialist and get them to listen to your noise for a proper diagnosis.

Mick
 

·
Registered
Joined
·
13 Posts
Discussion Starter #3
The DMF noise is a heavy knocking noise, it may do it all the time or it may only doit when the starter engages but without hearing it in the flesh it is going to be just guess work IMHO. My advice would be to find a good Indy specialist and get them to listen to your noise for a proper diagnosis.

Mick
Does that apply to my car even it has Automatic transmission not Manual?
 

·
Registered
Joined
·
1,467 Posts
DSG,s do have a DMF but I haven’t personally heard of one failing yet, I have though heard them rattle from stone cold and also when very hot it’s usually just wear and tear IMHO.

Mick


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
336 Posts
Could be anything from a catalytic converter falling apart to a complete top end needing a rebuild. Best take it to a shop and get them to listen to it, least then they can at least see mileage and condition in general of the car.
 

·
Registered
Joined
·
1,467 Posts
Could be anything from a catalytic converter falling apart to a complete top end needing a rebuild. Best take it to a shop and get them to listen to it, least then they can at least see mileage and condition in general of the car.


Just as I said go see a VW Speacalist, it will stop all the guesses and could turn out to be something simple.

Mick


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
1,467 Posts
Thank you all. The reason people are posting here is to not go to dealers or mechanic!


Sometimes needs must and a good technician could save you money

Mick


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
262 Posts
Sounds like an issue with the hydraulic tappets. That, or an issue with the oil pump so its basically leaking so badly that it drains much of its oil out at rest, and needs to re-prime itself every time you start the engine, resulting in oil starvation for the first 5-10 secs of starting. The easy way to determine which, would be to monitor oil pressure immediately after startup.
 

·
Registered
Joined
·
13 Posts
Discussion Starter #10
Sounds like an issue with the hydraulic tappets. That, or an issue with the oil pump so its basically leaking so badly that it drains much of its oil out at rest, and needs to re-prime itself every time you start the engine, resulting in oil starvation for the first 5-10 secs of starting. The easy way to determine which, would be to monitor oil pressure immediately after startup.
Paul, I see the engine is dirty and there are a lot of oil around. could you please let me know how to check oil pressure? also, how should I check the oil pump? is it inside or can be seen from outside? I will do google after this comment :)
 

·
Registered
Joined
·
1,467 Posts
Paul, I see the engine is dirty and there are a lot of oil around. could you please let me know how to check oil pressure? also, how should I check the oil pump? is it inside or can be seen from outside? I will do google after this comment :)


The oil pump is inside the sump and to check oil pressure you will need an oil pressure gauge.

Mick


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
80 Posts
4- Car has new oil and filter, and I am sure previous owners maybe never changed oil.
Pkaka
This sentence concerns me, if oil changes have not been carried out regularly, who knows what gunk could be in the sump and the oil pick up pipe. Left unchanged for a very long time, engine oils can turn into a congealed mass, there's always the possibility that the oil pick up pipe is partially clogged causing causing oil starvation on startup.

This is of course pure speculation, identifying the problem without hearing the noise and determining the source is impossible.

Cheers

George
 

·
Registered
Joined
·
13 Posts
Discussion Starter #13
This sentence concerns me, if oil changes have not been carried out regularly, who knows what gunk could be in the sump and the oil pick up pipe. Left unchanged for a very long time, engine oils can turn into a congealed mass, there's always the possibility that the oil pick up pipe is partially clogged causing causing oil starvation on startup.

This is of course pure speculation, identifying the problem without hearing the noise and determining the source is impossible.

Cheers

George
George,
Thank you for your input. the sound is from the back of the engine ( by back I mean if you stand in front of the car, the back is close to the car than the radiator. I hope this make sense). I think, it might be something like you are stating, not enough oil gets up there during startup.
I will try to remove the oil pane and see how terrible is the oil pickup pipe.

Thanks again,
 

·
Registered
Joined
·
13 Posts
Discussion Starter #14
The oil pump is inside the sump and to check oil pressure you will need an oil pressure gauge.

Mick


Sent from my iPhone using Tapatalk
Thank you Mick for your input. I found how to do oil pressure test and I found it is not easy to get to it :(
 

·
Registered
Joined
·
262 Posts
Isn't it possible to look at live data off of the engine's built in oil pressure sensor, using the appropriate diagnotic tool? I have no idea if they have one, but I imagine they do - just that its used internally in the ECU, not shown as a gauge on the dashboard (but below a certain oil pressure and it would light the oil warning light and probably another too).

If not, then you'd need to tee into the oil pressure warning switch and temporarily install an oil pressure gauge.
 

·
Registered
Joined
·
262 Posts
Paul, I see the engine is dirty and there are a lot of oil around. could you please let me know how to check oil pressure? also, how should I check the oil pump? is it inside or can be seen from outside? I will do google after this comment :)
Probably worth cleaning it, running it a little bit then seeing if/where oil leaks out.

Its possible that oil leaked over a period of time, then oil quantity became low, the pressure problems occurred (especially at startup) and that goosed a hydraulic tappet (or more). But its only speculation.
 

·
Registered
Joined
·
5,819 Posts
Check oil pressure first with diagnostics. Oil pressure warning lamps usually trip at about 10psi and you could be running with 15psi oil pressure?:eek:

If you are sure the rattle is coming from the rocker area (?) you are getting an early warning that oil is either slow to get to the tappets or is leaking back when the car is left stopped.

There are a few reasons why oil leak back is bad. Oil should not drain back from the engine parts and genuine OE oil filters usually have an anti drain back valve inside. If your engine has an oil pressure type timing chain tensioner, research if there are any problems because most have a back flow valve or one way ratchet to hold the timing chain in tension when the engine and oil pressure stops.

Your 'top end' rattle at cold start could therefore be due to oil starvation in the valve gear, or the timing chain slopping about because it lost its tension. Both are potentially serious problems needing further investigation.
 
1 - 17 of 17 Posts
Top