Lack of Power
2005 Jetta 1.9TDI 172k miles
This car is something I am going to look at tomorrow so any test ideas I can perform will be appreciated. Diesel driveability are not my strong point. Prior repairs done already:
intake removed and sent out for full complete decarbon cleaning, EGR replaced, Turbo assembly replaced.
No codes are stored
On test drive has severe lack of power, can sometimes hear turbo boosting and feels somewhat OK, other times it feels like it can't get out of its own way. Was told someone already unplugged MAF to see if power is restored, no change. Just trying get a starting point on this since so many parts have already been replaced. All help is greatly appreciated.
I think this model has that exhaust throttle/restrictor underneath. That would be something to check for sticking closed.. if it does actually have one
Look into the fuel supply. Check the pressure and flow.
Hello Jonathan, Lack of power generally means lack of fuel volume, so I recommend you look there first. What is low pump pressure, but more importantly what is the volume? Of course, make sure you verify the intake system is clear and the turbo is correct. Check for a choked back pressure valve or wastegate issue.
Check the air filter. If the filter is black on the “clean” side suspect worn cam lobes. The fuel filter must be clean. The cam lobe that drives the high pressure pump also wears. Restricted exhaust is possible. At that mileage, with no previous service history, suspect everything!
Hi Jonathan, I , like you don't work on enough diesels and turbos to be efficient. So because the market has recently changed, where so many manufacturers are putting turbos on, I've been getting a lot of great training form this guy on you tube. He is really good. Here is a link to his vw videos. youtube.com/user/CoolAirVw… If i was planning on looking at this, one of the…
Cool air is good with TDI's. However I am not sure of his expertise when it comes to other turbo vehicles. I would look to some of the other instructors out there.
TDI's are a specialty. I have several things for you to check. Give me a call tomorrow after 10 Am please. … Mike
I had The tech remove the valve cover the other day and found worn exhaust cam lobes. Parts are currently on order to replace the camshaft. Any other info is still great! I appreciate the response!
Good catch and 1 of my suggestions. There is a procedure to set up the injectors after you do the installation. Make sure you replace all the followers, bolts and bearings as well. I normally purchase 5 quarts of break in oil and run the new cam at 2K-3K for 20-30 minutes. Then I change the oil using VW 505.01 spec oil. I recommend Pentosin HPII 5w-40 or Motul X-clean 5w-40. If you have a…
Yes we ordered all of those parts. Procedure set up injectors? I did read in the service manual to wait 30mins after install camshaft to start engine or valves could collide.
The injectors are cam operated via the rockers. The easiest way to set them up is to either follow the book procedure available in alldata and I expect elsewhere or turn the engine over until each injector is fully compressed. One of the cam lobes on that cylinder should be straight up and down. Loosen the locknut and turn the hex key adjuster in just until it stops. Back off ½ turn and tighten…
Why not share those several things here for others? That is the purpose of DN, a community sharing their knowledge and experience.
Sometimes it's easier to go over things via phone without writing them out. Between me running my business and helping the technicians out in the shop it's just easier to do it by phone. Plus I can't type for shit!
I not only can’t type, but my memory is crappy too. The reason for posting this stuff is it may help someone down the line. Over on the black hole site Albin Moore posted a great diag for TDI direct injected VW’s that could be found easily. As I have no access to that site any more and I don’t remember much past the dirty air filter and cam lob wear that is what I posted in this thread. As these…