Last post on Nov 17, 2013 at 8:38 AM
You are in the Volkswagen Jetta
What is this discussion about?
Volkswagen Jetta, Biodiesel, Diesel, Sedan
#4707 of 4777 Re: MPG [ronsteve]
Oct 22, 2012 (6:03 pm)
I agree. I always fill up to the neck. My record mileage, obtained last summer, was 823 miles and running on fumes in the end.
#4708 of 4777 Re: Long commute with stop and go traffic [schranker]
Oct 23, 2012 (1:21 pm)
You want another 11 mpg , buy a. Set of nokian entyres. Next time u need tires .
#4709 of 4777 Re: Long commute with stop and go traffic [ggeeoo]
Oct 23, 2012 (2:31 pm)
I *already* run Nokian enTires on my TDI and always add cetane-enhancer at every fillup.... perhaps that is why 50+MPG is the norm for me.
#4711 of 4777 tires & TDI mpg / drafting
Oct 24, 2012 (2:45 am)
thanks for the reality-mpg-check data on that one, cosmo! tires are good for a couple or three TDI mpg , such as switching from summer to winter tires.
one factor in low-rolling-resistance tires is that the possibility that they also provide lower-friction-coefficients while braking - increasing braking distance in emergency stop. there's no fooling mother nature.
Another way to boost mpg more than 11mpg, try drafting a cooperative bigrig, feet off the bumper- you'll really feel the mpg savings and how it pulls your car (or motorcycle). Just as a test, I'm saying.
#4712 of 4777 Bad fuel gives me the Shudders
Nov 06, 2012 (10:15 pm)
My 06 TDI really has a sensitive engine. On some brands of diesel the car will go into convulsions between 2000 and 2300 rpms when on cruise control.
It happens when the car is going down a slope and the engine is not using fuel but then when the grade goes back up and motor now needs fuel, it does a violent shake rattle and roll for a second or 2 then it's OK until the next same combination of CC, and road conditions.
The only thing I have found that prevents all this drama is changing the fuel brand. I drive about 500 miles a day for 3 days in a row, so each tank is run down to less than 1/4 and then I start looking for a fill up again and hoping for a no-shudder run.
I have tried truck stop fill ups and all the major brands...(Shell was the last one that the TDI had big problems with) Then I will have great luck with some no-name brand from some divey place in the middle of nowhere.
(I have always had great performance from Chevron GAS in my Honda Odyssey, but the Chevron diesel is another story...poor power, bad mpgs and lots of shudders.)
So far I have not met anyone behind the counters selling diesel who has ever even heard of Cetane ratings..(I do ask) much less what their pumps might have.
Seems some forum posters are having these issues with the new models of VW TDI's but so far nobody with a 06 except me, has mentioned it. One uninterested VW service writer said "it probably needs to come into the shop and have the cam shaft and valve followers changed" A story he probably uses to make his service dept another $2000.00 that day.
Not saying the car at 110,000 miles doesn't need the top end looked at, but it will run fine on certain diesel and run like crap after the next fill up from a different location. Covering 2000 miles in 3 days puts me at 4 different stations in 3 different States.
#4714 of 4777 Re: Bad fuel gives me the Shudders [longo2]
Nov 07, 2012 (4:42 am)
WOW. I have a diesel truck and this is quite a story. I really have no idea but I wouldn't think of the fuel filter as the problem. You need to change every 15K or so. It's been a long time since I saw a vehicle that w as picky about fuel.
#4715 of 4777 Re: Bad fuel gives me the Shudders [coontie66]
Nov 09, 2012 (5:54 pm)
You're right, it's not the fuel filter, changed it out last year, shuddering still a mystery.
While on a brief trip the other day, I noticed the "battery" warning light had popped on. Thought it might be the serp' belt or alternator so stopped and had a look under the hood.
Somehow the pulley had completely come off the alternator but the belt was still running on the bare shaft! I guess the belt wasn't getting enough grip to spin the alt' enough and the warning light came on.
Local VW dealership had to order a new pulley and it will be here in a week.
The Jetta TDI alt' pulley not a solid pulley, but a clutch design, a rather complicated item..designed to grab and pull under load one way, but will free wheel the other way....
(Also a very pricy item that requires a special set of tools to take off and install...unless it flies off all on it's own like mine did!)
This guy goes through it much better and says..."it's a wear item that should be changed with each serp' belt R&R"...
#4716 of 4777 Re: Bad fuel gives me the Shudders [longo2]
Nov 09, 2012 (7:42 pm)
The pulley coming off the alternator is VERY COMMON. If you read thru the tdiclub.com website, you will see.
If you think the pulley is expensive.... for a long while, the pulley was NOT A REPLACEABLE ITEM and you had to replace the entire alternator when the pulley failed. In the last several years, the pulley became a separate item.
This happened to my TDI around 140K miles. I replaced pulley AND the the failed tensionor.... good to go for another 140K miles.
The reason for the pulley issues is because on the TDI engine the alternator pulley has a SPRAGUE CLUTCH. This one-way clutch allows the alternator to 'overrun' when the engine is decellerating.
DO NOT put a solidly-installed (non SPRAGUE) pulley on TDI engine.