daniel mason
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| posted on 8/2/15 at 01:22 PM |
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VAG diesels?
Out of all the more recent vag diesels from say 2006 onwards. What are the pros and cons of each? Any issues with any of specific models?
I had heard the 2.0 could be potentially problematic with injector issues costing a pretty penny to fix!
What about the various 1.9's and later 1.6 units?
It will need to be capable of towing around 1000kgs max and will either be in an mpv (Alhambra etc) estate or small panel van like vw caddy maxi
Cheers
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adithorp
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| posted on 8/2/15 at 01:48 PM |
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A lot of the issues with them (and other makes as well) come down to not driving them hard enough... DPF, EGR and variable turbo problems often stem
from "economical" driving and short journeys causing them clog up. Drive them hard though and you'll go through a lot of front tyres
(had a customer with a 170bhp Sharran who insisted her clutch was slipping. I could find nothing wrong so went out with her driving... she was smoking
the n/s tyre everytime she put her foot down). Personally I'd go for a lower power ones and drive it hard than the more powerful ones that you
drive gently all the time.
The Caddy doesn't have a lot of weight on the rear so might not be great towing.
ps go for one thats had 10000 mile oil changes not recommended 20,000mile. Stay clear of supermarket derv.
[Edited on 8/2/15 by adithorp]
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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dubzter
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| posted on 8/2/15 at 01:53 PM |
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I've just committed to buying an A4 avant 2.0 tdi multitronic (2010) don't really know a huge amount about any problems that they may
have. What I do know is that I test drove it back to back with a 1.6 and a 2.0 Passat (both 2012) and it was like night and day. The 1.6 (around
100bhp I think) was guttless I was very disappointed and I wouldn't want to try towing anything of significant weight with it. The 2.0 (around
140bhp) was better but the ride in the A4 sold it for me, much more refined and all in all just a far nicer place to be than in the passat.
I'm coming from a 2004 1.9pd tdi passat saloon (130bhp). Bought it with 40k miles on it now at 160k without any significant issues. A burst
turbo hose was the worst thing that happened.
quote:
Originally posted by daniel mason
Out of all the more recent vag diesels from say 2006 onwards. What are the pros and cons of each? Any issues with any of specific models?
I had heard the 2.0 could be potentially problematic with injector issues costing a pretty penny to fix!
What about the various 1.9's and later 1.6 units?
It will need to be capable of towing around 1000kgs max and will either be in an mpv (Alhambra etc) estate or small panel van like vw caddy maxi
Cheers
[Edited on 8/2/15 by dubzter]
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cliftyhanger
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| posted on 8/2/15 at 02:02 PM |
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I know the 2006ish onwards 2.0 diesels are a bit of a mare with teh DPF's. Friend had one from a main dealer for 3 months. Well, about 3 weeks
the rest of the time in a hire car. The DPF needed changing but the dealer couldn't diagnose it. He was eventually told he had bought "the
wrong car for his type of driving" and given a full refund. I understand the later 2010 (?) onwards cars are better, but diesels in general seem
to have an eclectic set of issues these days, mainly from emissions equipment and trying to make them nice to the planet. And don't talk to me
about glow plugs that snap.
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obfripper
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| posted on 8/2/15 at 05:53 PM |
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The later pd engines with piezo injectors suffer with injector failure, most of these have been covered with vag group recalls though.
The 1.6 and later 2.0 cr-tdi engines have the EGR valve at the rear of the engine, under the turbo & hidden behind the oil feed/return and dpf.
They fail regularly, and depending on how open the valve ends up, can leave the car immobile.
The valve is ~£400, and half a days work to fit on a good day.
The actual component that fails is a tiny roller bearing that follows a groove in a cam, the small amount of corrosive gas that seeps past the valve
plunger rots the bearing, causing it to break up and no longer touch the cam. A repair is not an option, as the cam and stepper motor are laser welded
together.
Light throttle driving seems to be the main cause, i have seen failures at as low as 20k with short journeys, with multiple replacements on some cars,
yet cars doing 20k a year driven hard with no problems at 100k+.
The EGR not fully closing can also cause the DPF to fail to regenerate, as the dpf is starved of oxygen, so cannot burn off the trapped soot, this
will throw the car into limp mode pretty quick.
Quite often none of the symptoms will show up with a fault code relating to the egr valve, as the electronic part of the valve operates as normal,
making diagnosis tricky.
The dpf differential pressure sensors can also play up, causing the dpf to fail regeneration without apparant cause.
The dual mass flywheels also dont react well to being used at low rpm consistantly, absorbing all the low rpm vibration causes the bearings to fail
which results in the moving section of flywheel to become off centre under load & therefore vibrate.
Dave
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