my ish got all slow for no reason - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• my ish got all slow for no reason by RabbitJockey on 01 Aug, 2006 16:25
• ok, so i had been messing with my fueling and stuff, and yesterday i turned it up just to give someone a ride in my car, then i turned it back down,  this morning my car drove perfectly normal, but on my way home i ran out to 2 different stores, and i started to notice it was running funny.  but the engine seems completely fine.
  
  heres the stuff i noticed that was weird
  
  1 it has very low amount of power
  2 when dry revving it's kinda sluggish
  3 it has a hard time producing boost, it slowly reaches it's way to like 10 pounds
  4 off boost power bad as well.
  5 something i thought was weird was that the motor seems very smooth, which you can definetly feel with my polyurethane motor mounts
  6. the idle hasn't changed, didn't slow down or speed up
  
  i am completely lost, can anyone help?  could mean messing with fueling have done this?  with a closed wastegate i went to 23psi, 2 or 3 times, and left the motor cool down after wards.
• #1 by jtanguay on 01 Aug, 2006 17:17
• whats the outside temp like? hot? humid?  today it was really hot and humid and my diesel ran pretty bad
• #2 by hillfolk'r on 01 Aug, 2006 17:23
• yea her car was piggin it today,its about 90-92 with like 99% humidity
  yucky
  um this sux man
  check stupid stuff,got full throttle?
   drop the f.filter. out and see if theres water in it or somethin?
  open up the air cleaner,there isnt small mammals stuck in there is there??
  hmmm
• #3 by SMOKEYDUB on 01 Aug, 2006 17:24
• air filter? does it smoke? and did you watch how much you turned down the fuel? try increasing ever so slightly. intercooler? check all boost hoses check the little hose that runs to the lda there famos for roughting under the weiving.stuck open wastegate?
• #4 by hillfolk'r on 01 Aug, 2006 17:27
• yeai just thought that too
  boost leak
  did ja lose the hose to the lda or somethin???
  
  hmm have ya been drivin round with that wastegate loosened,and it finally broke free for ya???
• #5 by RabbitJockey on 01 Aug, 2006 18:32
• i closed the wastegate as soon as i got home and didn't notice a difference, it doesn't smoke at all, i checked the lda, but it doesn't drive like when the lda hose pops off, it's faster with the lda hose popped off than what it is now,  it is hot and stuff today, but i mean it is rediculously slow, not just a little slower, yeah i watched how much i turned the fuel, it's currently at the stock position (which is where it was set when i got the motor),  i'll mess with it tomorrow as it is dark out.  and i know the boost hose since i have no intercooler, the little rubber elbow is fine cause i just had it off and back on like 2 days ago and it was tight, it's cooler out now i'm gonna go drive it and report back...  it kinda seems like the problem could be fueling,  does vane pump going out do this, could a vein pump just go out like this?
• #6 by hillfolk'r on 01 Aug, 2006 19:30
• in my experience,it seems that if ya have the fuel turned up any at all  ,they seem to "starve", or surge...
  but its not really noticible until you add a lift pump and then ya realize its better/smoother  on power
  therabbittree's  injector pump went out recently,he told me the other day..
  he has an aux lift pump,and at first when it acted up,it seemed like the internal vane pump went out,because  it wouldnt run unless the aux. lift pump was on
• #7 by QuickTD on 01 Aug, 2006 19:43
• Quote

  in my experience,it seems that if ya have the fuel turned up any at all ,they seem to "starve", or surge...

  
  
  Just fixed this problem myself, been fighting with it for over a month. Surging and cutting out and generally poor power. Couldn't figure out where it was getting air... Turns out a worn pump driveshaft seal can allow air to enter the vane pump under at high revs/power, even though it doesn't leak fuel to the outside. You will see foam in the return line if you rev the snot out of it, but no bubbles in the inlet hose. New seal would probably fix it, but I fixed mine for good with a low pressure (8psi) lift pump...
• #8 by burn_your_money on 01 Aug, 2006 19:50
• I think I ran too much injector cleaner through my car and fried the injectors. It runs like a dog right now and gets miserable mileage. Perhaps your injectors are messed up.
• #9 by RabbitJockey on 02 Aug, 2006 08:24
• Quote from: hillfolk'r

  in my experience,it seems that if ya have the fuel turned up any at all  ,they seem to "starve", or surge...
  but its not really noticible until you add a lift pump and then ya realize its better/smoother  on power
  therabbittree's  injector pump went out recently,he told me the other day..
  he has an aux lift pump,and at first when it acted up,it seemed like the internal vane pump went out,because  it wouldnt run unless the aux. lift pump was on

  
  
  yeah, but i have the pump back to slightly below stock fueling, after work i'm going to go over all the the stuff i was messing with this week, and try to wind the wastegate shut even more.  see what happens, at some points it almost seems like it's the clutch, but i dunno, it's hard to say, i also wanna check for water in the air filter.  but everything seems in order so hopefully i can figure what it is, and it's nothing major...
• #10 by RabbitJockey on 02 Aug, 2006 15:24
• i turned the fuel up just a tad, it looked like it was backed off a little bit more than what it should have been, which obviously helped, but something still seems to be holding it back,  maybe it was just a combo of the weather and the fuel being back a tad, we'll see once it cools off
• #11 by zyewdall on 02 Aug, 2006 19:23
• Hate to ask the obvious, but have you changed the fuel filter?  You've described the classic symptoms of a clogged fuel filter for my truck.  I don't know if ones not running biodiesel clog suddenly like this, but biodiesel  cleaning old diesel junk out of old tanks tends to do it pretty suddenly -- like fine, then a few miles later, it won't go above idle.
• #12 by RabbitJockey on 02 Aug, 2006 20:15
• nah it runs and idles fine.  the fuel filter is supposed to be pretty new, with in the last couple thousand, and it looks new too,  and i haven't ran any bio yet, but my dad had that problem with the clogged filter.