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    VWVortex


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    Thread: I need major help :/

    1. Member yayo01's Avatar
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      Apr 26th, 2009
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      San Diego, CA
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      01' Jetta 2.0, Mk2 Jetta Wolf, mk2 GTI 16v, mk3 golf city
      04-04-2012 03:25 PM #1
      1987 GTi
      PL 16v with 143k miles

      The car runs fairly well, unless it's warm/hot outside which really sucks because I live in San Diego.
      The motor has New Bosch plug wires as well as plugs,
      New coolant temp sensor,
      New o2 sensor,
      all vacuum lines have been renewed,
      injector o-rings and cups have been replaced,
      it has a re-manufactured fuel distributor,
      new transfer pump and main pump,
      new fuel, air, and oil filters
      all ground connections have been cleaned and coated with dielectric grease
      new fuel pump relay

      yesterday it was pretty warm outside and my car would not start, I let it sit for about 5 minutes and it started and ran fine. Today it started fine then 2 minutes later it shuts off and doesn't want to start, I let it sit for a minute then it starts and again just shuts off. WHY??
      (This is not the first time this happens)
      Any help would be greatly appreciated.
      Mk2 daily project...

    2. Member Jones84's Avatar
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      84 GTI 2.0 High comp 16vT on MegaSquirt, 00 Subaru Outback
      04-04-2012 09:51 PM #2
      Fuel pump relay.. When they get hot they stop working sometimes. I have had this happen to many customer cars and mine.
      84 Rabbit GTI, 12.1.1 comp 16VT, 15psi 307whp 278wtq Winner 2012 bugRun Pro class
      JONES PERFORMANCE VW, Swaps, Custom Builds, MS install & tuning. MK1, MK2, Specialists
      2vwjones@gmail.com Website under construction.

    3. Member ps2375's Avatar
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      80 Rabbit(DEAD), 94 Golf
      04-04-2012 10:24 PM #3
      You need to determine if you are missing fuel or spark when it fails to start. An easy way to do this would be to carry around a timing light. Then you can throw it on to check for spark. And I also did not see an ignition switch on the list, those are known to fail and cause weird problems.

      And you can also pull the fuel pump relay and jumper it to see if it is the relay or not, at least you could rule out the relay.
      Tradition is the art of making the same mistake repeatedly, on purpose.

    4. Member
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      79 Scirocco 82 Rabbit Truck 85 Golf D 87 GTI 97 Passat TDI 03 TT
      04-05-2012 12:57 AM #4
      replace the check valve on the output of the fuel pump. it is supposed to maintain system pressure with the car off. about 15 bux

    5. Member EL GOLFO DE MEXICO's Avatar
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      89 gti
      04-05-2012 03:32 PM #5
      sorry for not really be helpful but could you tell me all the grounds locations please

      I'll really appreciate it

    6. Member broke..'s Avatar
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      77 rabbit 2door (16v swap in progress) 95 jetta aba 5speed daily
      04-05-2012 03:42 PM #6
      a bad fuel accumulator will cause this problem too... or so i was told.
      A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. - Douglas Adams

    7. Member 8716vrocco's Avatar
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      Feb 12th, 2001
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      Scirocco 16v, MKVI GTI, Honda VTX1800F
      04-05-2012 04:55 PM #7
      Quote Originally Posted by Jones84 View Post
      Fuel pump relay.. When they get hot they stop working sometimes. I have had this happen to many customer cars and mine.
      This. Mine would run for a while, relay would get hot and car would die out. Wait a little bit and it would fire right up, then die again. The relay is pretty cheap and you could probably walk into the dealer and get one.
      Project 16v Lysholm

      "I hope you go commando, otherwise your panties would always be in a bunch"

    8. Member yayo01's Avatar
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      01' Jetta 2.0, Mk2 Jetta Wolf, mk2 GTI 16v, mk3 golf city
      04-05-2012 08:04 PM #8
      Thanks for the input, I will try the fuel pump relay first then go from there.
      Mk2 daily project...

    9. Member Youngfonza's Avatar
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      87 16v gti silver
      04-05-2012 10:15 PM #9
      Does anyone have a diagram that shows the correct temp sensor switches in the rear of the head? And I would like to know the proper wire configurement as well. One of mine came off while at the shop and I don't know if I don't need the connection and they removed or w/e the case is.

      Furthermore my fan has not been coming on lately, at what temp should my fan come on? I just wanna make sure so the summer does bite me in the arse. Thanks for time: and sorry for thread jacking.
      I love haters...motivation

    10. Member ps2375's Avatar
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      80 Rabbit(DEAD), 94 Golf
      04-05-2012 10:24 PM #10
      Quote Originally Posted by Youngfonza View Post
      Does anyone have a diagram that shows the correct temp sensor switches in the rear of the head? And I would like to know the proper wire configurement as well. One of mine came off while at the shop and I don't know if I don't need the connection and they removed or w/e the case is.

      Furthermore my fan has not been coming on lately, at what temp should my fan come on? I just wanna make sure so the summer does bite me in the arse. Thanks for time: and sorry for thread jacking.
      All that info is located in a Bently Manual.
      Tradition is the art of making the same mistake repeatedly, on purpose.

    11. Member Jones84's Avatar
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      84 GTI 2.0 High comp 16vT on MegaSquirt, 00 Subaru Outback
      04-06-2012 01:18 AM #11
      Quote Originally Posted by ps2375 View Post
      All that info is located in a Bently Manual.
      The best tool you can have in your tool box...
      84 Rabbit GTI, 12.1.1 comp 16VT, 15psi 307whp 278wtq Winner 2012 bugRun Pro class
      JONES PERFORMANCE VW, Swaps, Custom Builds, MS install & tuning. MK1, MK2, Specialists
      2vwjones@gmail.com Website under construction.

    12. Member yayo01's Avatar
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      01' Jetta 2.0, Mk2 Jetta Wolf, mk2 GTI 16v, mk3 golf city
      04-06-2012 05:23 PM #12
      So I replaced the fuel pump relay and started the car, it all seemed fine until the car reached operating temperature then it turned off. This time it fired right back up and didn't turn off anymore. I don't know if I should call it fixed yet though... could this issue be caused by timing in any way?
      Mk2 daily project...

    13. Member ps2375's Avatar
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      80 Rabbit(DEAD), 94 Golf
      04-06-2012 05:40 PM #13
      doubtful
      Tradition is the art of making the same mistake repeatedly, on purpose.

    14. Junior Member
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      1989/VW/Golf GTI
      04-07-2012 03:27 AM #14
      Quote Originally Posted by yayo01 View Post
      So I replaced the fuel pump relay and started the car, it all seemed fine until the car reached operating temperature then it turned off. This time it fired right back up and didn't turn off anymore. I don't know if I should call it fixed yet though... could this issue be caused by timing in any way?
      are you sure that the mixture is set correctly ? try enriching it if that happened again but keep a record of the old setting in case it didn't help
      The fuel dizzy should lean the mixture whenever it reaches the operating temp, if it was already lean when cold then that would shut it off.

    15. Member yayo01's Avatar
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      01' Jetta 2.0, Mk2 Jetta Wolf, mk2 GTI 16v, mk3 golf city
      04-09-2012 12:29 PM #15
      So I've driven the car these past few days and nothing related to what I described has happened.
      I'm going to knock on wood and say that it is good to go
      Mk2 daily project...

    16. Member
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      92 Jetta GLI 1.6TD Ripper (VNT20 Turbo), 86 GTI (Wolfsburg Golf), 86 Audi Coupe GT
      04-09-2012 01:21 PM #16
      if the terminals in the fuse box are dirty AT ALL then the fuel pump relay can act up, just like you describe..

      my 86 GTI used to do the SAME THING as yours, so i pulled the fuel pump relay, checked it, and there were a few dirty terminals, mainly the TINY one, and thats the one where the coil signal goes to. if the relay has no coil signal, it shuts the pump off.

      i cleaned the fuse box connection, and the relay connection, and plugged/unplugged the relay a few times to get any junk out of the connector that i could.. then i eventually just replaced the relay with an audi 4k relay (to remove my rev limiter, im running CIS-lambda) and i havent had the issue since then.

      i would lean HEAVILY towards a fuel pump relay as the culprit..

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