2001 jetta tdi auto. only runs 345 miles on a full tank of diesel
Full filter, air filter,injector nozzels are new. .189mm. It's smoking black & a lot. There is still no change in ml/gl. I bought a tird party OBD II cable with software that is supposed to work as a VAG-COM diagnostic tool. I scanned it, and it shows no codes. I still have not registered the tool, but i have tested it and it stops a lot of the smoke, but i can not save the changes. Am i going the right way to turn this engine more economical?
Re: 2001 jetta tdi auto. only runs 345 miles on a full...
The catilic converter may be clogged. this could b.e the reason for the black smoke .it could also cause poor fuel mileage .you might try removing it and see if the black smoke stops .if it does change it and your fuel mileage should improve
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start wih #1,try using a can of redexe/wynns injector cleaner(1 can to 1/2 tank diesel)works well...#2 use 10/40 semi synthetic(best you can afford).i prefer not to use any other fuel additives(other than redexe)as VW group products are susceptical to "clogging"(dirty/high sulphur fuel dont help).i use a can of red every 25k,tailpipe dark grey......
If you have a lot of black smoke then its over fueling getting to much diesel to the cylinder's. Sounds like an injector problem with the slight knocking noise. Che ck the return pipes are not blocked. If the smoke is dark brown then this is a problem with the valves on the intake manifold which control's the intake of exhaust emmisions.
"MAS" sensor, thank you...when you unhooked it you "faulted" the ECM, returning to "limp back" mode...Injectors go wide open...fouling the MAS, and possibly others and the problem occurs again...and again...It runs OK when you're on the interstate because you have max air pressure in the plenum-tract. I'm afraid you'll continue this unless you spend the money to have it diagnosed. I do NOT recommend the dealer, maybe a local mechanic with diesel/import exp? Good Luck P.S. I believe you have more than one filter...try running Premium Diesel if available in your area for a couple tanks.
assume diesel engine ? so if water was in fuel ? the engine would not run even b4 it got to engine because fuel filter would rstrict diesel due to water on filter element ? can i just say that from your symptoms ? black smoke/engine runs but poor ? the fact it is black smoke? is most due to lack of air flow to manifold remove air filter element and see if smoke clears? if element of filter has got wet ie floods? it will not allow air through? make sure there is no other restriction/s on filter inlet and outlet pipe to manifold espcially check now for any weakness on pipe to engine from filter ie when you rev up look to see if hose is sucking together due to vacuum created by revs of engine? if injectors were defect ? the smoke would be blue due to over fuel injection ie injectors not atomizing correctly ? i would suspect problem is lack of air? out of curiosity?? how did water enter fuel tank ?? if any more info you can provide it may give better idea of problem ?
It is on the passenger side right behind the washer fluid fill tube. You can follow the fuel lines (look like 1/4" black tubes, some are clear) from the injector pump to it. It is a caniser a bit bigger than a normal looking oil filter and sits between the washer bottle and the metal that forms the wheel well. It is held in by a screw type clamp about half way down the cylinder. Probably isn't the fuel filter unless there is air in the lines to the injector pump or they didn't bother to fill the fuel filter up with diesel after putting it in. There is not a fuel pump in the tank in these cars so everything is sucked up by the injector pump and it needs to be primed properly.