Last post on Nov 17, 2013 at 8:38 AM
You are in the Volkswagen Jetta
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Volkswagen Jetta, Biodiesel, Diesel, Sedan
#1603 of 4777 VW TDI starting issue and diesel additives?
Dec 05, 2007 (4:46 pm)
We've had our VW Jetta Turbo Diesel for like 4 years now. It is a 2003 Wagon. I just had a few questions.
The check engine light came on two weeks ago and it was hard to start. Around that time it was around 7C (from Canada so we go by C not F) it didn't want to start very well so I brought it to the dealer where we got it and it had two bad glow plugs. Great like 200$ later on the way home. So two days after that the light comes on again. I make an appointment and I took it back today. It was the glow plug bar that connects all the glow plugs together. Or however it works. Anyways. The service guy says that they are harder to start from +7 to -2C than they would be if it was warmer or colder. Something due to the short time the plugs are on at that temperature. My question is, is that true? Or am I being fed lies? The car in the whole 4 years we've had it has never had any of the glow plugs replaced, has always been in for regular services and recalls. I think maybe there is 70,000Km's on that car.
Next is should we add something to our diesel when it gets cold out? If so what does anyone reccomend or should I just buy from the dealer?
Hoping to hear something
#1604 of 4777 Re: 2003 TDI Jetta wagon [traumagas]
Dec 05, 2007 (7:52 pm)
Does the car start ok, have good power, etc? I'm the first one to bang the "dealers suck" drum particularly when it comes to timing belts, but there's usually more symptoms than just poor mpg to a bad timing belt. That's a very dramatic change in fuel mileage. Dragging brake or even a combination of things. Check your tire pressure as dealer might have lowered it during service.
Timing a TDI requires software and manual adjustments. And talent. Find a diesel mechanic that knows TDI's and he'll be able to do it with his eyes closed.
You don't have to run H-rated tires. They tend to handle better, but if you're a conservative driver, go for a T or S rated tire and you'll get much better tire mileage and all-weather performance (typically).
#1605 of 4777 Re: 2003 TDI Jetta wagon [sebring95]
Dec 06, 2007 (6:26 pm)
The power seems okay, I bought it with 75k on it so I have nothing to compare it to
I have read that Carbed up intake could decrease the power. I also hear that winter mix fuel and ULSD also can decrease power. I have cleaned Mass air sensor with the correct cleaner, I have ran Injector Cleaner SEAFOAM in a Half tank and Air filter is clean. The tires all have 44 psi around Using Nitrogen ( for what that is worth )
I into the area where the boost pipe clamps on seems to be about 3/4 inch of carbon in there. Seems that would need to be cleaned esp when Head was off !!!
I have to say When the HONDA accord Diesel hit here I am going for one !!
Why in the Heck would not the dealer De-carb the intake when they were there and able to do it is Beyond Me !!!
#1606 of 4777 Re: 2003 TDI Jetta wagon [traumagas]
Dec 06, 2007 (7:05 pm)
To answer your question about tire ratings .... It is general practice to install tires based on the speed the vechicle CAN acheive... not on how the driver claimes he drives. This is a very basic safety rule for tires.
Since VWs are designed to run all day long at 85+ MPH on the autobahn... most tire sellers will only install H-rated or above lest they may get sued if a question arises about the suitability of the tires for that vehicle.
For example, Costco tires will not even consider selling you tires that are speed-rated below what their computer tells them about your vehicle.
The bigger question about tires is WHY THE HECK WOULD ANYONE WANT >15inch TIRES? They ride tougher, protect the rims less and are farrrrr more expensive to replace that standard-sized tires.
BTW: On my 2003 Jetta, I run Nokian WR tires.... In fact I run Nokian tires on all vehicles in the family.
#1607 of 4777 Re: 2003 TDI Jetta wagon [bpeebles]
Dec 06, 2007 (7:47 pm)
I have four questions, if you'd be so kind.
1. Do you notice any mpg advantage, penalty or is it neutral over oem tires? I currently have GY LS-H's
2. What kind of mileage are you getting from a set? 50,000, 60,000 on up?
3. What is the UTOQ rating for the WR? ( GY LS-H is 360)
4. Would these tires be good running in more normal higher speed desert conditions?
I looked at the specification page and the WR tires that I would use (195/65/15/ 91H )have 12.5/32nds over the usual 10/32nds.
So for example all things being equal 2.5/32nds more can be a significant advantage.
#1608 of 4777 Re: 2003 TDI Jetta wagon [ruking1]
Dec 07, 2007 (7:05 am)
Thought I'd jump in for a second. I switched to Nokian WR's in the 195/65 going into winter several years ago. I was very impressed at how well the Nokians handled in the dry. As for snow performance, I think you'd run out of ground clearance long before those tires would give up. Ice performance was also very good, but not like say a Blizzak which is tremendous but too compromising on dry handling for me.
I noticed no change in mpg going to the Nokians over the stock Continentals. I don't have logs in front of me, but I think I ran two sets of Continentals and around 80k switched to the Nokians. I believe the last set went on around 130k miles and at 160k when the Jetta was totaled they still looked pretty good. So 50k miles would be a fairly reasonable number and I drive aggressive. The Jetta with Nokians felt like a tank in the snow. I got in some snow with the Civic the other day and 45mph was a bit scary as I was being tossed around a lot. I was really wishing I had my Jetta back (or my truck.....lol). I don't know about desert conditions with the Nokians but they felt very good in the summer in southeast/midwest states.
However, if you don't encounter snow regularly (i try to avoid it or drive something else, but I don't want to drive my truck all winter just in case.....) I'm not sure I'd bother with Nokians. Winter or lots of wet driving really is their forte but there are other tires that perform just as good in the dry.
#1609 of 4777 Re: 2003 TDI Jetta wagon [sebring95]
Dec 07, 2007 (7:46 am)
Thanks for your input Sebring95 ! I am really trying to get my arms around the concept of the Nokian's. There seem to be still a few disadvantages to the Nokian's, despite the fact that almost EVERYONE I have talked with are almost universally impressed. As you and probably bpeebles probably know, there are a few more models of Nokian that would also be applicable. Besides the WR's, the i3's come to mind.
As for the main reason why one would get Nokians (snow/ice), in CA here we have a pretty schizophrenic situation. If folks are interested or will indulge me, as the explanation is probably not on topic, I can do my best to explain. If not, I can delete or so can the host.
When there is snow (where I would most likely go) in the mountains, the worst conditions require passing a so called chain control station. Now while we are required to carry chains for so called category one conditions, (just short of a blizzard white out), the realities are they will close the roads before that happens, to even snow removal equipment. Next level down, they allow snow removal equipment and if they do not have problems, would require folow on vehicles to "chain" UP except for SUV (with 4WD's). You can be required to chain up even Nokian equipped, up to dedicated snow tires. As I have indicated, they will let SUV's with 4WD with ALL SEASONS tires go ( with no chains). I can use an SUV, so have no real NEED to consider or put up to dedicated snows on the Jetta ,unless I absolutely insist on taking only IT. In addition, I would have to buy snow cables or chains. If I do not, I risk being turned back at the chain control points! The SUV also fits all the inevitable junk you have to or find yourself taking driving in snow anyway.
The Nokian dealer indicator shows the nearest to me is app 160 miles R/T . Now I know if I search, I can probably get them delivered and mounted locally. Probably the best would be continue north to Oregon and get Nokian's mounted and balanced and tax free to boot! But at first research they appear to sell at a premium. So given my tire history, I would be looking to a min of 100k from a set. So my take is that is probably dreaming!?
The overwhelming majority of my mileage was done on dry to DESERT dry conditions. I can almost count on one hand max two hands, how many times I have driven in a driving rain.
#1610 of 4777 Re: 2003 TDI Jetta wagon [ruking1]
Dec 07, 2007 (8:32 am)
Well personally, I'd stick to the SUV. You know when you go that direction it's probably going to be crappy weather. And if the cost ratio you're looking for works out to 100k.....i think it'd be a stretch. I really know zip about Nokians other tires. If I KNOW I'm going to hit snow, I drive the truck. It has A/T's and gets around better than the Jetta with Nokians. Some folks say a FWD car with snow tires is better than a 4x4 with all-seasons and I might agree to a point, particularly ice. But A/T's make quite a difference on a 4x4, surely due to deeper tread. While it doesn't give me a ticket to run crazy speeds, I have a lot more flexibility. Instead of sitting in traffic the other day I could have just crossed the median with my truck (yeah I know it's illegal, sue me) and circled back to the previous exit. But driving in TN, KY, OH, IN you never know what's going to happen so I prefer to have the car setup to handle it the best possible.
#1611 of 4777 Re: 2003 TDI Jetta wagon [ruking1]
Dec 08, 2007 (7:37 pm)
Some of your questions were answered above. I have additional comments.
I am getting a measured 56 MPG on the Nokian WRs. This is better than I was measuring with the original Michalins... but a TDI engine takes a long time to break in and may not have been fully loosened-up by the time they wore out. Also, I run about 35PSI in my tires to get the least rolling-resistance.
I was VERY disapointed with the wear-rate of the original Michalins that came on my Jetta. Replacing them with the same tire would have been quite expensive and Michalin tires DO NOT HAVE A MILAGE WARANTEE like most other tires on the market do.
Incase you were not aware, the Nokian WR is one of the rare tires on the market which carry the SEVERE SERVICE rating. which are suitable for use in snow. These are NOT the same as "all season" tires which are not rated for use in snow.
Also, it is not obvious from reading the literature about the WR... but the "high silica" compound really means that there is microscopic powderd "sand" imbedded into the rubber. Among other benifets, this allows the tires to "bite" into ice where plain rubber tires just slide around.
If you are not concerned with snow traction, perhaps somthing other than the WR would be more suitable for your driving conditions.
#1612 of 4777 Re: 2003 TDI Jetta wagon [bpeebles]
Dec 08, 2007 (8:05 pm)
Thanks for your input bpeebles! How much did the Nokian WR's set you back? The local Costco will put on a set of Michelin Primacy MXV4's for app 120 each. Considering I have Toyo TPT's awaiting 60 each, that would indeed set the cost per mile driven very high. Against the GY LS-H, (110,000 miles) to get the same cost per mile driven, I would have to get 132,002- Michelin , 82,501 Toyo. The 82,501 miles seems more likely and do able.