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Sedans Volkswagen Jetta VW Jetta TDI
3707 messages, Last post on Nov 30, 2009 at 6:14 PM
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Replying to: longo2 (Mar 12, 2009 2:44 pm) The 1.9 ltr TDI's could carbon up enough to eventually stop the engine, and the clean up process is expensive, dirty and doesn't really solve the problem. I have heard that the new 2 ltr TDI engine is a complete re-design, so am curious if anyone has heard that the clogging up problems of the older engines has been resolved. All common rails are not created equal. Many Liberty CRDs experienced EGR valve failure early (22k miles on mine) due to LSD fuel. Failures dropped dramatically after ULSD fuel was widely available (40k miles on 2nd EGR valve and still going). Punch a CRD and lots of black smoke goes out the exhaust. The Dodge Sprinter with the Mercedes engine is a very clean diesel engine. I see them a lot where I work. They are driven hard and I have never seen even a wisp of smoke go out the exhaust on one. I just inspected the intake on my 2005 PD Jetta TDI last week and there is very little carbon build up at 87k miles. If it happens to need cleaning it’s not technically difficult and I can live with it. |
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| For those who are interested, I live in NH and was watching TV and noticed a commercial for some TDi 09 Jettas still in stock at Lakes Region VW. I mention this because when I first purchased mine I was told I could expect to wait for about 6 months or more (this was in June of 08) for a car as they were high in demand. I ended up purchasing the dealership test model when VW made them available for sale to the public. I got the $28k plus version of the Jetta with Sirius and all of the other bells and whistles for the same price as the base model TDi. So far, I love my new Jetta. Its great on gas, and has saved me tremendously in costs as I traded in my old Subaru for the new Jetta. WAY better fuel efficiency! I have near 13,000 miles on my Jetta, and have had no problems. I love it. | |
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Replying to: siberia (Mar 13, 2009 3:50 am) It' been suggested that a lot of urban driving contributes to the build up, but longer drives where the system gets hot, will help keep the crap moving through the engine, like it's designed. Any thoughts? The local VW shop recommends that the TDI intake manifold and head should be completly removed, soaked in a strong solvent and blown out, not any kind of chemical flush used on the engine. At over a hundred dollars and hour for shop rate now, that would be a nasty bill. I am seriously considering a new 09 Jetta TDI. So call me a Nervous Nellie if you must, but no solid information on the re-designed engine does bother me.
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Replying to: longo2 (Mar 13, 2009 6:47 am) I wonder if this posting from "Freds TDI' is getting close to the secret of why some TDI engines do and others..don't.............. "Oils that lack the CG-4 or CH-4 rating don't have the same level of anti-foaming and soot-dispersing capability. The best quality diesel-engine oils deal with it and render the soot as harmless to the engine as possible. Oils that don't meet the CG-4 or CH-4 ratings can't handle as much soot, so you need to change them sooner. Finally, cheaply made oils (not the same as cheaply priced ...) usually won't have the same resistance to breakdown at high temperatures, that good quality oil does. High temperatures are found in the turbocharger. When oil breaks down at high temperature over a period of time, it "cokes" or builds up deposits in the high-temperature areas, which then restrict lubrication. Bye-bye, turbo." If you buy a "Pre-loved" VW, you don't really know what oil has been used for changes. The VW recommended motor oil is expensive and hard to find, so if my intuition about human behavior is even half right, some V W's have been fed the wrong oil after the dealership services are over...and then I have heard that even they can't be trusted to always use the right product. Makes you wonder if this is the a big part of the answer...
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Replying to: longo2 (Mar 12, 2009 2:44 pm)  45K on odometer & no problems. I believe ultra low sulfur diesel may have something to do with no gunk buildup. I could be wrong.
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Replying to: chuckycheese (Mar 13, 2009 12:27 pm)
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Replying to: chuckycheese (Mar 13, 2009 12:27 pm) Hey chunky, mind sharing with us exactly what they told you? So far there have been several theories presented as to the Coking problem. i.e. wrong oil, bad diesel fuel, lugging the motor to save fuel, and mostly city driving. Hold your nose and watch this video of a unique way of cleaning out the Crud in a TDI manifold! http://www.errachidia.org/video/video-tdi-2-oet4qWeZuYA.html |
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Replying to: longo2 (Mar 13, 2009 6:47 am) I doubt it very much. I don't think the previous owner even changed the air filter or the fuel filter much less had the carbon cleaned. I have never seen an air filter bulged out over an inch in the middle and a fuel filter this corroded. It' been suggested that a lot of urban driving contributes to the build up, but longer drives where the system gets hot, will help keep the crap moving through the engine, like it's designed. Any thoughts? There is evidence from the nature of the tire wear that the car was driven hard, or at least braked hard. |
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Replying to: longo2 (Mar 13, 2009 8:25 am) To the extent that there is a design defect in TDIs, that defect is that the engines have EGR valves. The 2009 TDI has the advantage of burning ULSD fuel from the start. |
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Replying to: sebring95 (Mar 13, 2009 6:13 pm) My '05 TDI looks like it might have around 1/8 inch of soot by the time it hits 150k miles. The previous owner must have abused it just about right. 
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