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  • #1

    TDI rough idle

    So my '01 TDI started doing something strange. If I go from a high RPM to an idle quickly while driving, it drops to a rough idle. Once or twice its been REALLY rough, like missing a cylinder almost, but usually its not too bad. I don't get any codes.
    I talked to George at Tunedub, and he's thinking its probably my injectors. I run cleaner all the time, and just had the fuel system purged, so if it is injectors, the are probably dying as opposed to dirty. They are .205 ijectors that I got used from Simon L. I'm not sure how many km's they had from him, but I don't think it was that many. I have since added about 100,000km to them. They are an OEM .205 injector (not nozzle replacements).

    I'll book it in here sooner or later and get the issue confirmed, but has anyone else experienced something like this?

    cheers

    **update:
    they are OEM from 110hp tdi engine (ASV) is the model
    Last edited by stefan; 02-11-2009, 03:42 PM.
    Stefan
    -> '19 Deep Black Pearl Alltrack
    -> '05 Urban Grey Passat Wagon TDI.
    -> Past rides: '14 Allroad, 06 Mazda5, '98 Jetta K2, '01 Jetta TDI, '91 Mazda B2200, '81 Toyota Cressida
    -> FutuRe Ride...??!
    Tags: None
  • #2
    Re: TDI rough idle

    Could be a bad nozzle. I had the same issue when I put in some new .205 nozzles. Got them pop tested and sure enough one of them was bad. Got it replaced and voila better idle.
    Last edited by darkmanCANADA; 02-11-2009, 09:55 AM. Reason: spelling
    2012 VW Jetta GLI

    Comment

    • #3
      Re: TDI rough idle

      Kinetic Motorsports and Diesel Services Group both sell nozzles and injector assemblies.
      2012 VW Jetta GLI

      Comment

      • #4
        Re: TDI rough idle

        You have not touched your timing or done any Vagcom adjustments lately?
        Could also be your IQ is out, easy change in Vagcom as well.
        Ben
        2016 Ram 3500 Laramie
        2000 Jetta TDi, Dead and removing parts
        2005 Passat Wagon TDi, 310,000 km's and counting, BSM delete done....Trans died going to replace
        Her's
        2016 Toyota Highlander XLE Pearl White

        Comment

        • #5
          Re: TDI rough idle

          my IQ is down a bit to cut on smoke. Been like that for the last 100,000km with no problems though. Haven't changed anything else.
          Last edited by stefan; 02-15-2009, 03:32 PM.
          Stefan
          -> '19 Deep Black Pearl Alltrack
          -> '05 Urban Grey Passat Wagon TDI.
          -> Past rides: '14 Allroad, 06 Mazda5, '98 Jetta K2, '01 Jetta TDI, '91 Mazda B2200, '81 Toyota Cressida
          -> FutuRe Ride...??!

          Comment

          • #6
            Re: TDI rough idle

            Played a bit with the IQ. Put it back to stock setting and went for a smokey drive. Its hard to make this all happen on demand, but I did get a result and got the engine to idle rough again. So it's probably not the IQ setting at least.
            Stefan
            -> '19 Deep Black Pearl Alltrack
            -> '05 Urban Grey Passat Wagon TDI.
            -> Past rides: '14 Allroad, 06 Mazda5, '98 Jetta K2, '01 Jetta TDI, '91 Mazda B2200, '81 Toyota Cressida
            -> FutuRe Ride...??!

            Comment

            • #7
              Re: TDI rough idle

              Injection pump on it's way out?
              2012 VW Jetta GLI

              Comment

              • #8
                Re: TDI rough idle

                And moisture around the injectors where they seat?
                Here is your options if you don't have a leaking one.
                A: Start with a different set of nozzles, oem, performance, something you know that will work.

                B: Yeah the pump is a possibility but at that price the injectors are a cheaper option to start, especially with 100,000 km's on them.

                C: You live with the issue right as it's not a performance issue and does not hinder your driving experience.

                Honestly Injectors sound like the likely culprit, but crank sensor, partially clogged fuel filter, Fuel temp sensor, or how about one of the temp sensors.

                Pick and choose your battles.

                Ben
                Ben
                2016 Ram 3500 Laramie
                2000 Jetta TDi, Dead and removing parts
                2005 Passat Wagon TDi, 310,000 km's and counting, BSM delete done....Trans died going to replace
                Her's
                2016 Toyota Highlander XLE Pearl White

                Comment

                • #9
                  Re: TDI rough idle

                  a: will probably do this. talked to tunedub and das auto house for some options.

                  b: hope not...

                  c: have done this for a while now, but it's getting worse so i think its time to do something. Have only had one instance where the idle went reeealy rough, but letting this happen often that cant be good for anything.

                  as for sensors, yeah - there is a lot of options... can probably rule out a few by maybe seeing if the numbers make sense with vag-com. Should be well within the life of my fuel filter (unless i picked up some dirty fuel).

                  i didn't pull out the injectors, but looked at the from the outside and didn't see any obvious moisture/signs of leaking.


                  Hey, what are the opinions on nozzles? Are the KermaTDI ones worth the extra money over the Kinetic ones?

                  **another thought: My car is at 210,000km. Maybe I should go back to an OEM injector just to lessen the abuse on an aging car? thoughts?
                  Last edited by stefan; 02-16-2009, 10:25 AM.
                  Stefan
                  -> '19 Deep Black Pearl Alltrack
                  -> '05 Urban Grey Passat Wagon TDI.
                  -> Past rides: '14 Allroad, 06 Mazda5, '98 Jetta K2, '01 Jetta TDI, '91 Mazda B2200, '81 Toyota Cressida
                  -> FutuRe Ride...??!

                  Comment

                  • #10
                    Re: TDI rough idle

                    Auto or 5 Speed?

                    5 Speed go with some PP520's, get them from Bleachbora though, or Boraparts.com.
                    Why, I don't know if you have seen or heard anything from Kerma lately, but right now he is in some hot water for not paying some bills.
                    http://www.complaintsboard.com/compl...m-c130930.html

                    I have talked to Aaron personally as I heard about this before the complaint board was even up.
                    The choice is still yours, just figured I would give you some info so you don't get burned.

                    Ben
                    Ben
                    2016 Ram 3500 Laramie
                    2000 Jetta TDi, Dead and removing parts
                    2005 Passat Wagon TDi, 310,000 km's and counting, BSM delete done....Trans died going to replace
                    Her's
                    2016 Toyota Highlander XLE Pearl White

                    Comment

                    • #11
                      Re: TDI rough idle

                      5 speed.
                      interesting info...

                      pp520's are bigger than what i have already. i'm not really interested in more smoke. i think sprint520 are probably enough. (same as what i have, more or less)
                      Last edited by stefan; 02-16-2009, 02:35 PM.
                      Stefan
                      -> '19 Deep Black Pearl Alltrack
                      -> '05 Urban Grey Passat Wagon TDI.
                      -> Past rides: '14 Allroad, 06 Mazda5, '98 Jetta K2, '01 Jetta TDI, '91 Mazda B2200, '81 Toyota Cressida
                      -> FutuRe Ride...??!

                      Comment

                      • #12
                        Re: TDI rough idle

                        If you saw my whole deal last Oct/Nov then you know the hell I went through.

                        1. my 10mm pump was on its way out and eventually died. Calgary Auto Works sourced one out at a good price for me.
                        2. had a bad lift sensor in the #3 injector got that fixed.
                        3. one of the 205 nozzles was bad, got the whole set pop tested and replaced the bad one.
                        4. got my timing belt and water pump (plastic impeller) replaced at the same time

                        Now everything runs fine just a little more vibration that normal due to the 034 mounts. My wife hates it but she can drive her Tiguan. With all the work on my TDI I am surprised that the stock clutch is not slipping yet.
                        2012 VW Jetta GLI

                        Comment

                        • #13
                          Re: TDI rough idle

                          You can get PPs from evolution, http://www.evolutionimport.com/category_s/55.htm

                          Avoid import fees.

                          PP520s should smoke LESS than Sprint 520s. That is part of the point of the better nozzles.

                          Sorry, what other mods do you have?

                          edit: Oh I see your sig, Upsolute. Is it an Upsolute program made to work with the nozzles? You really should not have too much smoke if the program is correct.
                          Last edited by Red90; 02-17-2009, 11:35 AM.

                          Comment

                          • #14
                            Re: TDI rough idle

                            Originally posted by darkmanCANADA View Post
                            I am surprised that the stock clutch is not slipping yet.
                            I ran my stock clutch for 200000km, 120,000 of which were chipped and big injectors. They hold up pretty good to the extra torque.

                            As for the Upsolute question, I don't have the beta .205 program. It got lousy reviews. You lost a lot of power to clean up the bit of smoke. I'd rather have the fun torque and deal with a little smoke when I floor it .
                            Stefan
                            -> '19 Deep Black Pearl Alltrack
                            -> '05 Urban Grey Passat Wagon TDI.
                            -> Past rides: '14 Allroad, 06 Mazda5, '98 Jetta K2, '01 Jetta TDI, '91 Mazda B2200, '81 Toyota Cressida
                            -> FutuRe Ride...??!

                            Comment

                            • #15
                              Re: TDI rough idle

                              I don't suppose you've checked your intake manifold lately, right at the EGR? Throwing out ideas, but could be that your manifold is clogged up. Noticing loss in power over the last while?

                              Before buying new injectors, get your current ones pop tested.

                              Do you have bubbles in the fuel lines?
                              1989 Golf Diesel (2001 TDI powered before teh apocalypse)
                              1992 Jetta TD
                              2001 Jetta TDI
                              1999 GTI resto
                              1996 AEB GTI project

                              Comment

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