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    Thread: Having mid rpm hesitation/missing 1.7 jetta

    1. Member Fusor2's Avatar
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      04-08-2012 01:42 PM #1
      As is said in the title, I am having mid rpm missing and im baffled... The car will idle all day long and will full throttle all day long but hesitates when your giving it throttle. I replace the original distributor and pigtail with one from my good running gti With new plugs and wires. Also replaced the timing belt and had it timed to the bentley specs. The fuel pump has also been replaced because it was noisy along with the fuel filter. The injectors have been checked for pattern and volume new o-rings and all is good....No vacuum leaks and STILL it has the midrange miss and seems to chug going down the road when not at full throttle. any input would be greatly appreciated..... pics for clicks


      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

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      04-08-2012 02:19 PM #2
      Check the o2 sensor. By chug I guess you mean sputtering?

    3. Member Fusor2's Avatar
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      04-08-2012 02:51 PM #3
      By chug it will pull for a second then feels like its misfiring and is jumpy... the o2 sensor I believe is unhooked but ill see about replacing it today
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    4. Member Fusor2's Avatar
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      04-08-2012 07:15 PM #4
      well, hooked back up the o2 sensor and seems like no change. im not saying the sensor is good in the first place so i ordered a new one... anyone else have any more ideas...
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    5. 04-08-2012 07:25 PM #5
      Timing, control pressure (warm), fuel mixture too rich, fuel pump relay, fuel filter, fuel pump, ground wires, distributor cap and rotor, plug wires, injectors.
      Brandon A.
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    6. Member Fusor2's Avatar
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      04-08-2012 07:46 PM #6
      i have not checked the control pressure... still waiting on some parts to assemble my gauge. i have almost everything on the list new including pump and filter and the injectors were tested and look good... im not a noob to these cars just getting frustrated quick...
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    7. Member rabbitnothopper's Avatar
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      04-08-2012 09:41 PM #7
      hmmm..........im sure your floorpan hates you by now

      you put jackstands basically STRAIGHT THROUGH the floors........stupid



      why not use the correct jack points?

    8. Member 8v-of-fury's Avatar
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      04-08-2012 09:46 PM #8
      Car is a pos. who cares lol.

      Also that is not a 1.7 motor.

    9. Member Fusor2's Avatar
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      04-08-2012 10:08 PM #9
      Quote Originally Posted by rabbitnothopper View Post
      hmmm..........im sure your floorpan hates you by now

      you put jackstands basically STRAIGHT THROUGH the floors........stupid

      why not use the correct jack points?
      Holy Fuk who called the jackstand police.... At least im using a jackstand.... and i have a 2x6 under the contact patch, at least im using a jackstand...
      Still better than these guys i would think



      And as far as i know it is a 1.7 ... or at least its what it says on the side of the block... but then again i could be wrong. its a german built jetta and i thought all came with 1.7s
      Last edited by Fusor2; 04-08-2012 at 10:17 PM.
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    10. Member 8v-of-fury's Avatar
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      Because MK1
      04-08-2012 10:11 PM #10
      Quote Originally Posted by Fusor2 View Post
      And as far as i know it is a 1.7 ... or at least its what it says on the side of the block... but then again i could be wrong. its a german built jetta and i thought all came with 1.7s
      The 1.7's have the water neck coming out between cylinders 1&2, whereas the 1.8's have the water neck coming out between 3&4 like yours does. However, it could just be a 1.8 head on a 1.7 block..?

      The German built GLI Jetta's came with the 1.8L motor. Also, FYI all A1 Jetta's were built in Germany.

      Also, why not put the jack stands on the reinforced pinch welds like was designed??

    11. Member Fusor2's Avatar
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      04-08-2012 10:21 PM #11
      my jetta is not a GLI... you could be right about it not being a 1.7 and when i jacked it up i used the jacking point with my jack and placed the jackstand where i could. as you can see im working on this car in my back yard as i am moving and have alot of junk in my garage in boxes. Any ideas as to why my car is stumbling at off idle? And yes i realize the jetta may look like a piece of crap but if i dont save it somebody else would have sent it to the scrap pile.
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    12. Member 8v-of-fury's Avatar
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      04-08-2012 10:22 PM #12
      Quote Originally Posted by diive4sho View Post
      Timing, control pressure (warm), fuel mixture too rich, fuel pump relay, fuel filter, fuel pump, ground wires, distributor cap and rotor, plug wires, injectors.
      All of this.

    13. Member rabbitnothopper's Avatar
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      04-08-2012 10:23 PM #13
      Quote Originally Posted by 8v-of-fury View Post
      The 1.7's have the water neck coming out between cylinders 1&2, whereas the 1.8's have the water neck coming out between 3&4 like yours does. However, it could just be a 1.8 head on a 1.7 block..?

      The German built GLI Jetta's came with the 1.8L motor. Also, FYI all A1 Jetta's were built in Germany.

      Also, why not put the jack stands on the reinforced pinch welds like was designed??
      truth


      the reason both of my cars have rotted floors is because some asshats didnt use the correct jack points
      instead they opted to use the floorboard
      what happened? bent frame rails on the floor structural supports

      meaning most likely the weakest points in the car are now the "floor structural supports"

    14. Member rabbitnothopper's Avatar
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      04-08-2012 10:25 PM #14
      Quote Originally Posted by Fusor2 View Post
      my jetta is not a GLI... you could be right about it not being a 1.7 and when i jacked it up i used the jacking point with my jack and placed the jackstand where i could. as you can see im working on this car in my back yard as i am moving and have alot of junk in my garage in boxes. Any ideas as to why my car is stumbling at off idle? And yes i realize the jetta may look like a piece of crap but if i dont save it somebody else would have sent it to the scrap pile.

      check your fuel pressure
      what is the system pressure reading,
      what is the control (wur) pressure cold/warm?

      that will give you ideas what to check next

      most likely your valves arent closing fully, timing, bent valve, or carboned valve



      car is a car, whatever it looks like or drives like
      just as long as it gets you places safely and reliably

      im giving you a hard time about the floorboards because its stupid how you did it

      if you were going to use jackstands (on dirt...)
      lift the front of the car up by the control arm near the frame
      put the jackstand on the jack spot
      lower the control arm
      watch the car sink into the mud....

      did you ever wonder why you cant open your front doors when you lift the car up?
      thats why

    15. Member Fusor2's Avatar
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      04-08-2012 10:40 PM #15
      it just so happens that the asshat who owned it before me used the pinchweld to jack it up and folded it over... and now is a bit rotten, thats why i opted for the floor support with the 2x6. Im in the middle of a GTI resto to get rid of some rust... and i take on some serious projects...

      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    16. 04-08-2012 11:45 PM #16
      Since you say that you have replaced most of what was on the list I'm willing to bet your pressures are all out of whack. Low system and control pressures will cause a rich running condition and the car will buck down the road as you describe. Measure and adjust the system pressure, then the cold control pressure, then warm and also check the residual pressure after being shut off for 1 min.
      System 75 psi
      Cold 25
      Warm 55
      Residual at least 15 after 1 min.

      Don't quote me...these numbers are from memory.

      Also you may want to look into adjusting the valves.
      Brandon A.
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    17. Member rabbitnothopper's Avatar
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      04-12-2012 12:13 AM #17
      Quote Originally Posted by diive4sho View Post
      Since you say that you have replaced most of what was on the list I'm willing to bet your pressures are all out of whack. Low system and control pressures will cause a rich running condition and the car will buck down the road as you describe. Measure and adjust the system pressure, then the cold control pressure, then warm and also check the residual pressure after being shut off for 1 min.
      System 75 psi
      Cold 25
      Warm 55
      Residual at least 15 after 1 min.

      Don't quote me...these numbers are from memory.

      Also you may want to look into adjusting the valves.
      hope this information everyone has repeated helps you solve your hesitation issues

    18. Member Fusor2's Avatar
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      04-14-2012 02:36 PM #18
      System pressure 68psi
      Cold 22 psi
      Warm 52 psi
      Residual after a few min 25 psi

      Where do i go from here? the pressure across the board seems a bit low...
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    19. Member Fusor2's Avatar
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      04-14-2012 06:16 PM #19
      well, im stumped... i changed out the fuel distributor and still the same running issues. same pressure numbers as well... on a side note... i found the engine is a 1.8 FN code motor from a fox. Maybe this could be the source of my problem... it has started raining and couldnt change out the WUR in time...
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    20. 04-14-2012 09:07 PM #20
      You're going to want to shim the fuel distributor to bump that system pressure up to 75. something like a .5mm thick washer should get you close.
      If you Google how to adjust system pressure you'll find some DIYs.
      Brandon A.
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    21. 04-14-2012 09:08 PM #21
      Also did you check the dwell?
      Brandon A.
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    22. Member Fusor2's Avatar
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      04-14-2012 09:28 PM #22
      No I didn't check the dwell. What do I need to check? I will shim the pin tomorrow and let you know how it goes. I will also be checking for a callapsed lifer if shimming it does nothing.
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    23. Member Fusor2's Avatar
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      04-17-2012 09:08 PM #23
      So i added a shim and brought the pressure up to 74 psi... cold pressure is up a bit and warm also.. It will idle all day long and sounds good but the second i try to give it throttle it coughs thru the intake and wants to stall... im so lost... is it time to take it to a shop?
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    24. Member rabbitnothopper's Avatar
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      04-17-2012 09:15 PM #24
      just a thought...
      are you running good spark plugs, are the gapped to .028 inch,
      is the spark blue (correct) or is it yellow (bad) ?

    25. Member Fusor2's Avatar
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      04-17-2012 09:24 PM #25
      yeah im running good plugs, ngks and ill pull them and doublecheck the gap
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    26. 04-17-2012 09:59 PM #26
      Just went through this with my 84 gti turned out my ecu went bad. If you have a spare swap it out and see if it starts running better. If not you can test it using the procedure here. http://www.cabby-info.com/cis.htm. If things are working correctly you should also hear your frequency valve buzzing.

    27. Member Fusor2's Avatar
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      04-18-2012 09:52 PM #27
      i pulled the plugs and they were showing about .032 on the gap... the spark looks pretty good being blue/purple... so i tightened up the gap on them. I reinstalled them and started it up. it honestly sounded like it was running on two cylinders and when you applied the throttle it would cough and stall out. i pulled a plug and looked at it, it was wet, put it back in and now it wont fire. i think i might have fuel fowled the plugs so ill stop and grab some more tomorrow night. ill be swapping out the computer tomorrow to see if there is any difference.
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    28. Member rabbitnothopper's Avatar
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      04-18-2012 10:26 PM #28
      hmm...so explain to me your vacuum advance


      most have 2 vacuum ports (some do have one)

      one is on the rear goes to the air intake outlet
      you have two, one goes to brake booster, that one looks ok
      the one to the left..looks bad....and has nothing? connected to it

      second is on the check valve (that white thingy under the letter "EED")

      vacuum advance? anyone?...

    29. Member Fusor2's Avatar
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      04-19-2012 08:28 PM #29
      not sure what part your talking about but the vacumm advance for the distributor is t'd one goes to the back of the throttle body and the other to the white vacuum bulb under the "eed"... not sure where your going with this...
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

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      04-19-2012 09:02 PM #30
      I don't think I have ever seen a mki that someone didn't jack up in the middle of the floors people are mis led by those ribs that go down the center of each pan. Atleast 3 times ive had this problem when getting my cars inspected even after specifically telling them do not jack in the middle of the floor
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    31. Member rabbitnothopper's Avatar
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      04-19-2012 09:24 PM #31
      Quote Originally Posted by Trev0rBr View Post
      I don't think I have ever seen a mki that someone didn't jack up in the middle of the floors people are mis led by those ribs that go down the center of each pan. Atleast 3 times ive had this problem when getting my cars inspected even after specifically telling them do not jack in the middle of the floor

      there should be no reason to jack up the car for an inspection...

      and you should stand there with a video camera on them while they do it
      complain to the company and get free replacement floorpans.......dropped off at your door.......

    32. Member rabbitnothopper's Avatar
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      04-19-2012 09:39 PM #32
      Quote Originally Posted by Fusor2 View Post
      not sure what part your talking about but the vacumm advance for the distributor is t'd one goes to the back of the throttle body and the other to the white vacuum bulb under the "eed"... not sure where your going with this...


      well..
      you are saying



      i am asking if this is what yours Should be



      do you see the extra white line on the rear of the distributor?
      ....

    33. Member Fusor2's Avatar
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      04-20-2012 11:17 AM #33
      There is no other lines that come off of the distributor. The distributor is from my 84 gti if that matters... I redid the vac line to the distributor in case there was a leak or clog maybe and there is not any change
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

    34. Member Fusor2's Avatar
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      08-24-2012 10:10 AM #34
      Just to give an update... i had a really good mechanic buddy look at my car several weeks ago, he suspected the throttle body was leaking so we replaced it with a known good one and ran a little bit better. Then he suspected that the distributor was out of wack so we replaced it also and now it runs WAY better. It still has a bit of a hot start issue where i have to press the gas down to get it to fire and then it will miss for like 10 seconds but runs great after, i suspect i have a fowled plug or something. but here she is now.
      Quote Originally Posted by rod_knock View Post
      Remind me to drive up there this weekend and give you a PITD

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      08-24-2012 01:47 PM #35
      Looks good man. I need to get some rabbit bumpers on mine, not to stoked on the stock ones.

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