I drove one of the new twin turbo Audi a6 tdiv6 a couple of weeks ago and it was fairly rapid up to 120 (alconbury runway) and for a diesel it made a very nice noise.
CR170 - dirty diesel traits?
- Thread starter betty_swollox
- Start date
Didn't buy a diesel for it to sound nice. I would have kept me cupra if I wanted something that sounded nice lol.
Worst is when it first turns over a few times. The noise until it gets going is awful. Rattle rattle.
Neuspeed is definitely coming to compensate some.
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Neuspeed is definitely coming to compensate some.
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I fixed a Q5 2.0tdi cr last week for the exact same fault your describing, compression was between 24-25 bar (ok) ended up needing all 4 injectors (worn internally)
whats erratic about the compression?
I predict lots and lots of worn CR injectors across the vag range in the not so distant future...
Better not be. You'd think they would have learned from the PD....
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different fault mate, the pd's especially 170's get carbon build up which makes them go short to earth, car shuts down all injectors because of the drivers for the injectors then wont start.
Common rails usually wear internally which usually shows up more so from cold - symptoms - smoke, misfire, diesel combustion knock, lack of power and not usually a fault code stored.
but yeah good old vag injectors
Common rails usually wear internally which usually shows up more so from cold - symptoms - smoke, misfire, diesel combustion knock, lack of power and not usually a fault code stored.
but yeah good old vag injectors
Dealer said the compression "was erratic and all over the place". Picked the car back up today and they showed me the printouts of the two compression tests they did. Going by memory of the brief look I got at it two of the four bars were high and two quite low in comparison. Fairly sure a couple of the figures were around 14-15bar. Apparently they were within tolerance but only just. As I said, I only got a brief look at the printouts.
My knowledge isn't enough to decipher what I was looking at unfortunately.
Here's a vid of the noise it was making on start-up. Does this intermittently but only when cold.
http://www.youtube.com/watch?v=GvCQBYDvGak&feature=youtube_gdata_player
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put a pic up if you've got it of the test, compression shouldn't be erratic and all over the place.
wear limit is 19 bar, any thing under then you've got issues, also max variation between cylinders of 5 bar.
my speakers are crap on the laptop but sounds like duel mass flywheel knocking to me (worn)
wear limit is 19 bar, any thing under then you've got issues, also max variation between cylinders of 5 bar.
my speakers are crap on the laptop but sounds like duel mass flywheel knocking to me (worn)
Haven't got a pic of the printout unfortunately. Will ring them tomorrow and ask for the actual readings.
The noise in the video only happens occasionally but it's not as loud as it once was. The other odd thing is that when it does make a noise you can make it louder by turning the headlights on!
It's been back at the dealers twice for this and each time it hasn't made the noise or shown any faults. The slight misfire and shudder is the only thing they can find and these both started around a month ago. Frustrating to say the least as it's only done 24k miles (had it from new).
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Yeh get the compression results, the knocking will most likely something driven by the aux belt then as when you put the lights on your putting more load on the alternator.
and due to the fact that the alternator is driven by the engine you are puting more load on that too.
It sounds like it could be the slip clutch on the alternator pulley.
Mercedes do the same thing and sound like that too.
Mercedes do the same thing and sound like that too.
Hiya mate got your pm and the compression results are far too low, send me your engine code i.e cepa, cfffb etc.. and I will double check but they are low for a diesel.
Just to update you. Yes, it still makes the noise off throttle.
Apologies for hijacking your thread with other stuff mate!
Just to update you. Yes, it still makes the noise off throttle.
Apologies for hijacking your thread with other stuff mate!
quick copy n paste from elsa mate for cega engine
New: 25 - 31 bar
Wear limit: 19 bar
Max. deviation allowed between both cylinders: 5 bar.
Thanks for the info Rich. Much appreciated! Will be onto SEAT on Monday to get it sorted.
Got the car back. Injectors were ok when checked. Compression is now more equal across the cylinders but still low (17 bar being the highest) compared to what it should be.
It's not showing any fault codes and the dealer says it drives ok so they've returned it to me. Still doesn't go like it used to as far as I'm concerned. Any other bright ideas as to what might be causing the low compression?
It's not showing any fault codes and the dealer says it drives ok so they've returned it to me. Still doesn't go like it used to as far as I'm concerned. Any other bright ideas as to what might be causing the low compression?
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