98 Jetta TDI low power jssue

Discussion in 'VW Mk3 Jetta, Passat TDI and other/older diesels' started by Josh329, Jan 8, 2017.

  1. Josh329

    Josh329 New Member

    Joined:
    Jan 8, 2017
    Messages:
    3
    Car:
    1998, Volkswagen, Jetta TDI
    Location:
    Wilkes-Barre, PA
    Please delete and redirect me to a thread if this question has already been answered!

    Hello everyone, I'm new to the Volkswagen world and semi new to diesels...Just bought a 98 Jetta TDI with around 200k on it..having an issue with power.

    If driven like grandpa on a Sunday afternoon there's no issues. The moment I drive slightly harder such as accelerating onto a highway, whether in 3rd, 4th, or 5th gear and using more throttle, I can feel the power just drop off. I then have to hold it to the floor to maintain speed on small inclines. Restart and problem gone till I accelerate again. No smoke either. No dash lights. Completely stock, no mods. Oil changed and fuel filter. Even ran seafoam through oil before changing and fuel for about a week.

    No sure if related, but there is a tiny coolant leak coming from thermostat housing and the pipe going from heater core to oil cooler (No longer available for purchase). The speedo and temp gauges don't work either. Working on those soon also.
     
    login to remove this ad
  2. Seatman

    Seatman Well-Known Member

    Joined:
    Jul 9, 2010
    Messages:
    5,736
    Car:
    2000 Mk4 Golf Estate 1.9tdi 174 bhp
    Location:
    Scotland
    Mods:
    PP764's, turbo and mapping
    It's quite possibly turbo related, maybe a bad vac pipe or waste gate actuator or even a stuck waste gate.
    Your turbo works on pressure so the wastegate should operate with pressure applied.
    There's also a small pipe in the ecu that can need replaced.
    More info in the diy index
     
    Josh329 likes this.
  3. Josh329

    Josh329 New Member

    Joined:
    Jan 8, 2017
    Messages:
    3
    Car:
    1998, Volkswagen, Jetta TDI
    Location:
    Wilkes-Barre, PA
    Ok thanks, I'll look in to those. One of the first things I'd like to do is get a boost gauge installed so I can monitor the turbo. Think I'll do that first so I have a heading.

    Sent from my XT1585 using Tapatalk
     
  4. audi1z

    audi1z Member

    Joined:
    Oct 16, 2010
    Messages:
    368
    Car:
    Audi 80 1Z Engine
    Spend the money for a VCDS w/ adapter. You can e.g. read the fault codes, and monitor the relevant engine parameters including charge pressure.
    Having a boost gauge will only tell you what the actual charge pressure is, but not why. And I am very sure that your engine goes into limp mode, which means reduced charge pressure too.
    Cheers
     
    Josh329 likes this.
  5. Josh329

    Josh329 New Member

    Joined:
    Jan 8, 2017
    Messages:
    3
    Car:
    1998, Volkswagen, Jetta TDI
    Location:
    Wilkes-Barre, PA
    Thanks, I'll look into it

    Sent from my XT1585 using Tapatalk
     

Share This Page