Page 1 of 3 123 LastLast
Results 1 to 15 of 32

Thread: Jzx100 VVTI 1JZ starting/Idle issues

  1. #1
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Jzx100 VVTI 1JZ starting/Idle issues

    Hey Guys,

    I have an Auto Jzx100 that has started to act up on me. A couple of months ago I was cruising along, took my foot off the throttle to pull up somewhere and it just started idling really high- Around the the 2k mark. Turned it off and when I started it up again it had a really low idle- Around the 300rpm mark. I reset the ecu and it was ok for a couple of days then it was back to idling really low and stalling out when coming to a standstill. I went overseas for a month and left the battery disconnected during that time and when I came back it ran fine for a few weeks but then it started to act up again. Now it doesn't really want to idle at all, it just stalls out if you give it no throttle, but it does seem to run fine if you keep the revs up with the throttle.

    1. I have checked for codes and it doesn't seem to be throwing anything
    2. I have cleaned the ISCV...well as good as I could anyway
    3. Cleaned the MAF

    Do you have an ideas where I should start looking?

  2. #2
    Toyotard Conversion King Cuts's Avatar
    Join Date
    Jul 2006
    Location
    Tasmania
    Posts
    2,932

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Tried another ecu?
    Did the engine temperature seem to make a difference?
    ST205 Group A Rallye GT-Four 307kw atw @23 psi on 98oct, Now on E85.

    1973 TA22

  3. #3
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Quote Originally Posted by Cuts View Post
    Tried another ecu?
    Did the engine temperature seem to make a difference?
    I haven't tried another ECU but I did open it up and there wasn't any leaky caps or anything.

    Did a bit more testing on the weekend. After it was warm it did idle at around 500rpm. Took it for a drive and when I pulled up it was idling around 1k. Turned it off and back on again still at 1k. Left it and let it cool down, upon startup it wouldn't idle again.

    Any ideas?

  4. #4
    Toyotard Conversion King Cuts's Avatar
    Join Date
    Jul 2006
    Location
    Tasmania
    Posts
    2,932

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Coolant temp sensor perhaps.
    ST205 Group A Rallye GT-Four 307kw atw @23 psi on 98oct, Now on E85.

    1973 TA22

  5. #5
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Quote Originally Posted by Cuts View Post
    Coolant temp sensor perhaps.
    I was thinking that!

    Does the ECU coolant temp sensor have any bearing on what the dash gauge does?

  6. #6
    Toyotard Conversion King Cuts's Avatar
    Join Date
    Jul 2006
    Location
    Tasmania
    Posts
    2,932

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Nope different sensors
    ST205 Group A Rallye GT-Four 307kw atw @23 psi on 98oct, Now on E85.

    1973 TA22

  7. #7
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Just tested the coolant temp sensor

    Cold- 2250ohm
    Hot- 400ohm

    Is that within spec?

  8. #8
    RZN169R+2JZGTEVVTI+R151 Domestic Engineer madmont's Avatar
    Join Date
    Nov 2005
    Location
    Queensland
    Posts
    669

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Quote Originally Posted by Toon View Post
    Just tested the coolant temp sensor

    Cold- 2250ohm
    Hot- 400ohm

    Is that within spec?
    According to the Supra TSRM (which you can install on your Android device) that is acceptable
    Jealousy is a curse

  9. #9
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Quote Originally Posted by madmont View Post
    According to the Supra TSRM (which you can install on your Android device) that is acceptable
    Thanks mate. That should come in handy!

  10. #10
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    FYI this ended up being a faulty vvti solenoid. Replaced that and it runs like a dream again!

  11. #11
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Back to square one again! Thought it was fixed and drove some where on Sat night, came back around 2 hours later and it didn't want to run without any throttle. I got it running by starting with some throttle, it idled but very low -around 200rpm.

    When I got it home I tried disconnecting the maf and starting to see if it ran any differently but it wouldn't run at all...without throttle anyway. Upon connecting the maf back up again it ran normal again...until it seems when I shut off the engine and go to restart again. If I disconnect the maf and then start it again it will run fine again until I shut off and you guessed it disconnecting the maf and reconnecting it temporarily fixes it!

    Any ideas on what it might be? I'm about to lose my shit lol
    Last edited by Toon; 06-09-2016 at 05:12 AM.

  12. #12
    C2H5OH Powered Automotive Encyclopaedia George's Avatar
    Join Date
    May 2010
    Location
    Moscow
    Posts
    823

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Any trouble codes so far? Or will we keep on guessing?
    Basically could be anything from messed wiring to cracked coils (coil caps) to vvti cam gear acting up to faulty AFM etc etc
    Start with most apparent things like trouble codes, checking sensor voltages to be within specs when the problem occurs, fuel pressure when under load, fuel in fuel regulator's vacuum line, and so on

    Mind you leaky caps are sometimes not apparently leaky
    USSR GAZ24 with 1UZ-FE VVTi (UCV24) http://www.toymods.org.au/forums/showthread.php?t=60301
    Engine conversion is when you drive a shitbox which costs a whole LEXUS to own

  13. #13
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    There have been no error codes so far when I bridge te1 and e1 terminals. Would connecting up to something like tech stream likely reveal any codes when the manual method isn't?

    What do you mean by coil caps? I have replaced the coil connectors and the coils themselves don't appear to be cracked.

    Vvti cam gear? What do you mean by that? I have replaced the vvti solenoid

    Is there any way to test the AFM or should I just try a replacement?

    Quote Originally Posted by George View Post
    Any trouble codes so far? Or will we keep on guessing?
    Basically could be anything from messed wiring to cracked coils (coil caps) to vvti cam gear acting up to faulty AFM etc etc
    Start with most apparent things like trouble codes, checking sensor voltages to be within specs when the problem occurs, fuel pressure when under load, fuel in fuel regulator's vacuum line, and so on

    Mind you leaky caps are sometimes not apparently leaky

  14. #14
    Junior Member 1st year Apprentice
    Join Date
    Aug 2006
    Location
    QLD
    Posts
    49

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    Ok this is weird. It is idling at like 2000rpm now! Any ideas wtf might be going on?

  15. #15
    C2H5OH Powered Automotive Encyclopaedia George's Avatar
    Join Date
    May 2010
    Location
    Moscow
    Posts
    823

    Default Re: Jzx100 VVTI 1JZ starting/Idle issues

    what exactly happened when you bridged the terminals? No error codes would make the warning light constantly flash at high rate.
    Coil bottom rubber seals can fade over time, also coil's case may contain small cracks, sometimes barely visible but enough to lose voltage before it gets to the plug
    vvti cam gear is big stuff driven by timing belt. It has two rubber seals which can develop leaks, and it can also seize

    AFM: disconnect battery, disconnect AFM, try to start. Should run ok at low rpm without AFM
    USSR GAZ24 with 1UZ-FE VVTi (UCV24) http://www.toymods.org.au/forums/showthread.php?t=60301
    Engine conversion is when you drive a shitbox which costs a whole LEXUS to own

Similar Threads

  1. jzx100 chaser bad idle
    By blktoy in forum Tech and Conversions
    Replies: 7
    Last Post: 24-09-2010, 10:28 PM
  2. 1JZ-GTE VVTi JZX100 Chaser - Wiring, Please Help!
    By walky_talky20 in forum Tech and Conversions
    Replies: 2
    Last Post: 09-01-2010, 02:51 AM
  3. 1uz's which version to get...is vvti the better starting point
    By Wildsupra in forum Tech and Conversions
    Replies: 13
    Last Post: 05-11-2009, 08:36 PM
  4. 7m starting issues
    By Disturbed1 in forum Tech and Conversions
    Replies: 17
    Last Post: 04-08-2007, 02:00 PM
  5. 4AGE Starting / Holding Idle problem
    By thanhngo in forum Tech and Conversions
    Replies: 15
    Last Post: 05-01-2007, 12:13 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •