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    Thread: idel jumping up and down on a 90 corrado help plz

    1. Junior Member dinho10's Avatar
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      03-20-2013 10:24 PM #1
      i need some help with my 90 corrado

    2. Member crazynorweegian's Avatar
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      03-20-2013 11:03 PM #2
      Quote Originally Posted by dinho10 View Post
      i need some help with my 90 corrado
      Cool.
      Stephen
      Portland, OR
      Black 1990 1.9L Stage 5 G60 - keeper
      Corrados decay in a way that can only be measured using quantum physics
      http://sites.google.com/site/corradoproject/

    3. Member ozzy1317's Avatar
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      03-20-2013 11:36 PM #3
      Quote Originally Posted by crazynorweegian View Post
      Cool.
      LOL

    4. Junior Member dinho10's Avatar
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      1990 vw corrado g60
      03-20-2013 11:52 PM #4
      Idle is up and down and wen it does that my screen in the insides goes 0's ( u kno the one that gives u the time and oil pressure) and there's a clicking in or by the fuse box, I just rebuilt my engine and it wasn't doing that... At times the car runs super smooth but then if I turn in off for a wile or for the next day it starts but the idle jumping up and down or it stays at 2000 for I bit then ill come down again.

    5. Member vdubCorrado's Avatar
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      13 Silverado - 91 Corrado - 99 Mustang GT
      03-21-2013 12:21 AM #5
      you probably forgot to reconnect the ground on the driver side of the head. it grounds your
      ECU along multiple other things... make sure that's put back, cleaned and with a clean surface on the head... if it is then you may want to consider regrounding that plate with an extra wire from it to the head, a valve cover nut worked fine on my 91 years ago

    6. Junior Member dinho10's Avatar
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      1990 vw corrado g60
      03-21-2013 12:32 AM #6
      R u talking about the ground that goes from the corner of the valve cover to the coil? That I did and I also re ground it and nothing....

    7. Member vdubCorrado's Avatar
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      13 Silverado - 91 Corrado - 99 Mustang GT
      03-21-2013 12:35 AM #7
      ECU, Coil and uhh... one other thing ground to this little bracket and then the bracket bolts to the back side of the head. if you dont have 3 grounds here then that is your problem. your ECU is not getting a proper ground causing the piss poor fueling and the loss of signal to the gauges.

      cant help you with picks as i no longer own a G60. if you have a Bentley i would star digging for diagrams around the cylinder head sections

    8. Junior Member dinho10's Avatar
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      03-21-2013 12:44 AM #8
      I have the ground from the back of the head there, that goes to the coil right? I don't kno wat u mean wen u say I should have 3 grounds there... And am new to this I also don't kno wat Bentley is...

    9. Junior Member
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      03-21-2013 04:30 AM #9
      Bentley manual .... should have been the first thing you bought...

    10. Member mateok's Avatar
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      90 G60 (since new) 93+VR 13 GTI
      03-21-2013 07:23 AM #10
      The ECU grounds from pin 13 straight to the battery negative post. The car won't even start if that's disconnected. You have four B/W ground wires going to the coolant flange on the head. Hall sensor, idle switch, CTS, and CO Pot.

      Idle issues on a G60 are so common, there's a half a billion threads out there covering it. If your idle is jumping up and down, that's usually the ISV or unmetered air getting in somehow.

    11. Junior Member dinho10's Avatar
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      03-22-2013 12:14 AM #11
      So I looked and looked and I kno it's not a ground issue and I changed the ISV so it's not, the car stays stable but at times it drops from 2000 to 1000 wile driving but it goes back to normal... Today I was driving it, it was good but as soon as I was on a red light the idle would start jumping up and down from 1000 to 1800 and back to normal...

    12. 03-22-2013 01:41 AM #12
      Check for vacuum leaks. I am having the same trouble and am in process of renewing my vacuum hoses.

    13. Member crazynorweegian's Avatar
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      03-22-2013 02:45 AM #13
      Quote Originally Posted by etomori View Post
      Check for vacuum leaks. I am having the same trouble and am in process of renewing my vacuum hoses.
      It is another case of the usual suspects on this. Your Bentley will help tremendously on this and you haven't mentioned having one so I assume you don't; shame on you.

      How exactly have you determined it is not a ground issue?

      Check the ground wire(s) that should be going to the side coolant flange on the head (not the ground straps on the hood and valve cover). Check this first, put on a new connector, clean up the wires, and spray some kind of cleaner/ protector on it.

      Other options:

      TEST and adjust your ISV, don't just replace it and assume it works.
      Blue coolant temp sensor (or wiring)
      o2 sensor (or wiring)
      Fuel pump(s) (or wiring)
      FPR
      ECU relay
      Fuel pump relay
      Ignition timing
      Clean injectors and inspect/ replace injector wiring loom
      ECU vacuum line
      Vacuum leak (test vacuum per the Bentley for leak)
      Super terrible boost leak (use DIY boost leak test from VWvortex)

      Good luck
      Stephen
      Portland, OR
      Black 1990 1.9L Stage 5 G60 - keeper
      Corrados decay in a way that can only be measured using quantum physics
      http://sites.google.com/site/corradoproject/

    14. Junior Member dinho10's Avatar
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      03-22-2013 12:06 PM #14
      How can i test or adjust my ISV?

    15. Junior Member dinho10's Avatar
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      03-22-2013 12:08 PM #15
      And were can i grt this Bentley?

    16. 03-22-2013 02:48 PM #16
      amazon, half.com, google, ebay, craigslist...

    17. Member mateok's Avatar
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      03-22-2013 05:40 PM #17
      Quote Originally Posted by crazynorweegian View Post
      TEST and adjust your ISV, don't just replace it and assume it works.



    18. 03-22-2013 07:52 PM #18
      Bentley Service Manual: http://wrdusa.com/mm5/merchant.mvc?S...radog60manuals

      Will make your life a lot easier
      www.WRDUSA.com
      Great Deals on Koni, H&R, Neuspeed, APR, SPEC, Techtonics Tuning, Eurospec Sport, and more!
      775-342-9591

    19. Junior Member dinho10's Avatar
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      03-22-2013 07:54 PM #19
      Did that. And my car still the same... Wen I turn the car on idle goes up and down. And the inside screen were it gives u the time turns off and on every time going to MFA2 0:00 I already got the fuel pump relay and still the same

    20. Junior Member dinho10's Avatar
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      03-22-2013 07:59 PM #20
      And thank ill try to get the Bentley ASAP

    21. Member mateok's Avatar
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      90 G60 (since new) 93+VR 13 GTI
      03-22-2013 08:15 PM #21
      Is the clock going blank and then coming back on? It gets it's power from circuit 30, Y3 connector, straight from the battery. There's a few other things on that track, as well. Cigarette lighter, pretty much all the switch lighting. Are those things acting stupid, too?

    22. Junior Member dinho10's Avatar
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      03-22-2013 09:37 PM #22
      No only the clock goes blank and back on everythionly thing als is good...only the clock blinks off and on

    23. Junior Member dinho10's Avatar
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      03-22-2013 10:54 PM #23
      Only the clock goes blank and on. And web it does there's a clicking sound by or in the fuse box. Everything alls is good just the clock goes blank and back on

    24. Member mateok's Avatar
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      03-23-2013 07:57 AM #24
      Pull fuse S21 (15a) and go for a drive. See if the problem goes away.

    25. Junior Member dinho10's Avatar
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      03-23-2013 10:13 AM #25
      I will do that today were is it located. And this morning my car was throwing smoke like a withe smoke

    26. Junior Member dinho10's Avatar
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      03-23-2013 02:01 PM #26
      Found it about to take it off and c war happens thank.....today I was driving it and my ignition switch died wile driving I had to change it.... I will take out the s21 fuse and c wat happens but if anyone can help with this.... My clock goes 0:00 or blank and back on and there's a clicking sound in or my my fuse box. Also bad idle and miss fire..

    27. Member 91vwg60's Avatar
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      03-24-2013 12:48 PM #27
      It appears grammar and proper writing skills are that of the ancients.
      Instagram - corradodaze

      Quote Originally Posted by crazynorweegian View Post
      The more parts you throw at a G60, the more minutes you get before it blows up.

    28. Junior Member 90corradosparks's Avatar
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      03-24-2013 01:58 PM #28
      have you checked the idle screw those decide to randomly pop out every once and a while

    29. Junior Member dinho10's Avatar
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      03-25-2013 02:05 AM #29
      this is how my cars sounds wen i turn it on and it does it wen am driving ... at hi idle...

    30. Junior Member dinho10's Avatar
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      03-25-2013 02:06 AM #30

    31. Junior Member dinho10's Avatar
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      03-25-2013 02:14 AM #31

    32. Junior Member dinho10's Avatar
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      03-25-2013 02:17 AM #32
      sorry this is the link this is how my cars sounds.... help if any one has had the same problem.. plz ans thank u...

    33. Junior Member dinho10's Avatar
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      03-25-2013 02:18 AM #33
      ill take a better video tomorro morning b4 going to work and ill post it latter that day thand guys....

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