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    Thread: 99.5 jetta wont start. PLEASE HELP.

    1. 05-25-2013 11:51 PM #1
      So i have a 99.5 jetta. car was running great. i let my gf borrow the car and she said she add oil to the car. i guess over by 2 quarts. she parked the car and couldnt get it started. some guy helped her get it started and she drove it back to my house. now that car wont start at all. i turn the key and the car revs up and die within a sec. i replaced the coil pack, cps, spark plugs, spark plug wires, cleaned manifold, cleaned throttle body. car still wont start. i hear a back fire everytime i turn the key. when i step on the gas pedal to try and see if it will stay on with gas pedal down... nothing. doesnt respond to the pedal. i am kind of at a lose. really dont know what else to do. maybe a bad fuel pump? fuel filter? fuel injector? fuel relay? car starts everytime for one sec so im kind of guessing it getting gas but idk. im really at a lose. please help.

    2. 05-26-2013 09:13 AM #2
      that sounds like the immobilizer is active. is the light for the security system on the cluster on when this happens?

    3. 05-26-2013 10:46 AM #3
      no light comes on. ive been looking. i dont think my car has one.

    4. Member ps2375's Avatar
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      05-26-2013 12:13 PM #4
      Check your fuel pressure and get it scanned for codes. FP won't cause a CEL, but the immo will(along with other things).
      Tradition is the art of making the same mistake repeatedly, on purpose.

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    5. 05-26-2013 06:20 PM #5
      Quote Originally Posted by ps2375 View Post
      Check your fuel pressure and get it scanned for codes. FP won't cause a CEL, but the immo will(along with other things).
      how do i check fuel pressure? how do i check immo if there is no light for it?

    6. Member ps2375's Avatar
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      05-26-2013 08:33 PM #6
      Quote Originally Posted by finsterbusch.1 View Post
      how do i check fuel pressure? how do i check immo if there is no light for it?
      My first thought and answer to this reply is to say,"step away from the car and let someone who knows what they are doing handle it."

      But, if you insist upon trying to fix it, fuel pressure is checked with a pressure gauge temporarily attached to the fuel rail, and the immo will cause a code to be present in the ecu, have it scanned with a proper scan tool that can read all the codes present. I prefer VAG-Com and I have no clue if a generic OBD scan tool will be of any use.
      Tradition is the art of making the same mistake repeatedly, on purpose.

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    7. 05-27-2013 02:59 PM #7
      yeah im going to work on it since thats the only option. dont need the comments like that just need a little help. ill have the pressure checked tomorrow and hopefully my scanner will be here this week. do those cheap vag-com scanners from china work?

    8. Member ps2375's Avatar
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      05-27-2013 03:51 PM #8
      Quote Originally Posted by finsterbusch.1 View Post
      do those cheap vag-com scanners from china work?
      dunno, I've only ever used the real one.

      And having a good service manual, like the Bently Manual, will help tons. GL
      Tradition is the art of making the same mistake repeatedly, on purpose.

      FS:MkI low back front seat upholstery(new)

    9. 05-27-2013 09:06 PM #9
      i think i found the problem. fpr... i removed the fpr and gas poured into the lines. i put it back on and the car started for a while till the gas ran out. i think the regulator is stuck closed. or something like that.

    10. 05-28-2013 07:17 AM #10
      well as already suggested you might want to get a gauge on the fuel rail and see exactly whats happening. fpr is a possibility but dont over look a weak pump or clogged fuel filter

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      05-28-2013 04:06 PM #11
      1999.5 cars in North America didn't have immo, hence why you see no light to that effect. The problem lies elsewhere.

      Fuel pressure should be fed into the rail, the regulator should be on the return side. A stuck closed regulator would effectively deadhead the fuel pump, and rail pressure would skyrocket. Was any work done besides adding oil right before this started? Any chance the fuel lines got installed backwards?

      Also, this may sound stupid, but are you 100% sure that there is there gas in the tank (remember, the gauge/sender can break and be wrong).


      Quote Originally Posted by finsterbusch.1 View Post
      do those cheap vag-com scanners from china work?
      Pirated ones, no. They can actually brick control modules.

      However, you can get a cheap China cable and try it with VCDS-Lite. If it works with the shareware VCDS-Lite (shareware is extremely limited), pop the $99 for the full license and you'll have legit full VCDS.
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    12. 05-28-2013 08:49 PM #12
      no work was done to the car. it drove fine till parked one day. and yes half a tank of gas is in the car

    13. Member Bx V-dubber's Avatar
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      05-28-2013 11:43 PM #13
      ya need a vag scan tool. snap-crap,matcon & mac fool scanners are good but they cannot access all the info you would need from a vag scanner. the knock off vcds are garbage and will tease you by allowing you to use some things but not others from the program besides possible bricking. not sure on vcds lite. pay someone to scan it with a vagcom and work from there.
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      05-29-2013 08:27 AM #14
      Definitely get an actual fuel pressure reading. And get a good scan of the car.

      Here's a VCDS-Lite vs full VCDS function list:
      http://www.ross-tech.com/vag-com/vag-functions.html
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    15. 05-29-2013 10:26 PM #15
      hello all thanks for helping me. ok so today i took off the fuel filter. i noticed no fuel came out the end of the fuel filter... well just a couple drops. when i took the end off that goes from the pump into the filter a lot of fuel poured out. i dont know if that means anything. but im with you guys on checking the fuel pressure do you know of any sites that sell cheap pressure gauges? and i also turned on the car just before ignition just to see if my pump was even working and it was pushing out gas. not sure if its enough but it is working. im going to get my scan tool in this week so i can at least read some of the codes. and go from there. any advice you guys can give me on what else to look for? maybe vac hoses? and do i need to adapt my throttle body? i have the throttle body with the cable.

    16. Member Bx V-dubber's Avatar
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      05-29-2013 11:26 PM #16
      usually in the fuel filter you wont see a lot come out til you turn it upside down. ya really need a fuel pressure gauge to see if your getting spec pressure. harbor freight i believe sells one ya could use (don't quote me). don't know if the one autozone lends out will be compatible.

      btw: your first mistake was lending your car to your gf
      sorry couldn't resist that one
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    17. 05-30-2013 12:50 AM #17
      Quote Originally Posted by Bx V-dubber View Post

      btw: your first mistake was lending your car to your gf
      sorry couldn't resist that one
      yeah no joke. ran good... two hours later doesnt run at all. didnt even give any signs before that of any problems

    18. 05-30-2013 11:22 PM #18
      i replaced the fuel filter today. tried to run the car... same problem. i unplugged the throttle body again to see if that would help. car idles good now. but when i step on the gas the car dies. A least i have the car running now. seems like im making some progress.

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      05-31-2013 09:06 AM #19
      Still no codes or fuel pressure readings?
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      05-31-2013 09:37 AM #20
      First find someone near you with a vag scanner, use a fp gauge, and don't let a female drive your car, unless she's dropping money on parts. But get the proper tools cause your flying blind right now...hell vag-com will turn you in to a pro lol

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    21. 05-31-2013 02:24 PM #21
      tank vent valve short to ground. could this be my problem. i ran my scanner today and this came up

    22. 05-31-2013 04:50 PM #22
      scanner codes-

      17951- P1543- THROTTLE ACTUATION POTENTIOMETER- SIGNAL TOO LOW
      01165- THROTTLE BODY CONTROL MODULE-J338
      17988- P1580- THROTTLE ACTUATOR (B1) FAULT-MAY BE CAUSED BY LOW BATTERY IF FOUND WITH 16487(P0103)

      those are the codes that were on the scanner.

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      05-31-2013 05:32 PM #23
      Ok try this disconnect the battery for 3-5mins so the throttle body recalculate. Than see if it stays running.

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    24. 05-31-2013 07:29 PM #24
      didnt help

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      05-31-2013 07:53 PM #25
      I recommand you check it with a fuel gauge to make sure its getting the proper amount. Check the connector on the throttle body and fuses as well

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      05-31-2013 07:55 PM #26
      Worse case the fuel pump or throttle body is shot ...both you can get on eBay for under $100. And less than 10mins to install

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    27. 05-31-2013 08:13 PM #27
      the car runs with the throttle body unplugged

    28. 05-31-2013 08:28 PM #28
      what fuse and what relay control the throttle body

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      06-01-2013 08:21 AM #29
      You need a service manual. It will have wiring diagrams in it.

      The throttle body is basically controlled directly by the ECU. Check TPS function with a scan tool, clean it, and perform ADP with VCDS.

      I'm still wondering if this is a fuel pressure issue though.
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    30. 06-01-2013 01:35 PM #30
      ok here is the update. im having it towed over to a local European car shop that works on vw's. i only have 250 to spend to get it fixed. i figured ill let them look at it. may cost me 100 to figure out exactly whats wrong. i just started to do the math with 50 bucks it was gonna cost for the tool to check my pressure. i should just spend a little more and have a pro look at my. ill keep you all updated. thanks for all your help.

    31. 06-04-2013 01:59 PM #31
      throttle body needed reset.

    32. Member Bx V-dubber's Avatar
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      06-05-2013 10:46 PM #32
      for future reference, ya need a vag-com scan to fully see whats going on in these cars.
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    33. Member
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      06-06-2013 08:36 AM #33
      Quote Originally Posted by Bx V-dubber View Post
      for future reference, ya need a vag-com scan to fully see whats going on in these cars.
      Yep. A VCDS scan would have led us to that conclusion immediately.
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