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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 8th, 2014, 00:50   #1
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Default Tdi that say for awhile

I just bought a mk4 tdi. Unfortunately it's auto. But I will be doing a swap eventually. The car has sat for about a year. Obviously I'll need a new battery. Oil. And checking the coolant. What else should I do. Do I need to drain the gas tank and lines? Should I check the injectors? New fuel filter?
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Old November 8th, 2014, 01:51   #2
Cogen Man
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All those things wouldn't hurt. But I'd drain the diesel tank not the gas tank. Might want to look at the brakes and tires also.
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Old November 8th, 2014, 03:19   #3
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Lol yea. By bad about the tank. It's late. I'm tired. What would be the best way to drain it? Tired are good. And brakes. Will I'm sure need serviced.
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Old November 8th, 2014, 06:51   #4
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fuel will be fine, drive it for a tank or 2 then change the filter. diesel has a much longer shelf life then gas, years if it is not getting moisture.
01Golf(410k), 2013 Mustang V6 28-30 summer mpg, 2016 F150 RCSB 2WD 2.7L ecoboost.
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Old November 8th, 2014, 06:55   #5
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my 0.02-
Don't change things for the sake of changing things. Do you know for sure it needs a new battery ? The battery might take a charge and be just fine. If the fuel tank was properly capped, and hopefully more full than empty, good chance that is just fine too. I agree with changing the oil. Run it, see how it goes. One concern that comes to mind is the bearings on the idler and tensioner pulleys (both accessory and timing belts...) that could have developed rust from sitting for extended period without running... potentially leading to short term failures. Once it is running, watch the belts and oil and coolant levels like a hawk for at least the first couple months.

Congrats on your acquisition!
Best Regards.... Corsair....
2002 Jetta GLS TDI 5-spd 325Kmi, 2014 JSW TDI 6M
2006 Audi A4 Quattro Avant 2.0T 6M
2004 Jetta GL wagon 2.0L (gas) 5-spd (sold)
[also had 03 TDI GLS 5spd wagon bought new, sorely missed]
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Old November 8th, 2014, 18:56   #6
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You can drop in some additive before driving on the same fuel in the tank, change fuel filter, check lift pump for operation, wouldn't hurt to take egr valve off for cleaning and inspecting the manifold for soot clog. Pretty much that's what I did when I purchased my tdi.
2015 Golf TDi|DSG
2001 Jetta TDi
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Old November 8th, 2014, 20:42   #7
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I doubt you will find a lift pump if it has an ALH engine.

I'd start the engine without doing anything other than making sure it has oil and coolant.

As someone suggested, diesel fuel has a long life. It should be fine. I have a MK1 diesel that has 4 year old fuel in it. I start the car about every six months and let it idle for a 15 or 20 minutes.

My RV has 5 year old fuel in it ...........80 gallons! I start it about once per year.
'84 Vanagon '02 ALH TDI engine Malone Stage 1 tune. CAT, SS 2" exhaust, E-vac system, DMF with upgrade pilot shaft, 4.57 R&P, fan assisted IC. (32 to 35+ MPGs consistently)
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Old November 9th, 2014, 12:55   #8
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Thanks so much for the replies guy. The oil level is good. I need to replace the turbo. But once that's done. I'll charge the battery while changing it and we will see what happens. Thanks again
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