Login    Register

idle revs and engine toming

Need help or advice fitting or fixing something
  • Author
    Message

idle revs and engine toming

Postby michaeltburke » Sat, 15 Feb 2014 1:39 +0000

Hello there,
Mine is a 1.6 Eunos year 1991. I decided to try to alter the timing to 14 BDTC as opposed to its existing setting of 10 degrees. I also introduced a free flow intake filter system to replace the existing standard one. Typical of many owners I would suspect. I followed internet instructions and connected the GND and TEN on the diagnostics cube . I noticed the revs jump a bit when I did this . I brought them back to 850 with the idle screw and made the adjustments to the timing. Then I removed the jump wire from the cube . However the rev needle will not now return to 850 revs without a 5 second delay. When I reinsert the jumper wire to the diagnostic cube everything works fine again . I now have left the wire in permanently in the diagnostics cube because the pause in returning to idle is driving me nuts . Any advice .... ?
michaeltburke
*
 
Posts: 20
Joined: Mon, 25 Feb 2013 11:29 +0000

Re: idle revs and engine toming

Postby MX5Spares » Sat, 15 Feb 2014 9:11 +0000

Engine should not be running when doing diagnostic check. Just ignition on position
MX5Spares
*****
 
Posts: 2303
Joined: Wed, 22 Sep 2010 4:59 +0000
Location: dublin,

Re: idle revs and engine toming

Postby michaeltburke » Sat, 15 Feb 2014 9:57 +0000

Thanks for reply. However, and correct me if I am wrong, but to set timing with a strobe light the engine must be turning and GND and 10 connected. When this is achieved is the jumper connection then not disengaged?
michaeltburke
*
 
Posts: 20
Joined: Mon, 25 Feb 2013 11:29 +0000

Re: idle revs and engine toming

Postby MX5Spares » Sun, 16 Feb 2014 7:45 +0000

Set the timing while engine is running obviously but jumping the terminals then re sets new changes ???
MX5Spares
*****
 
Posts: 2303
Joined: Wed, 22 Sep 2010 4:59 +0000
Location: dublin,

Re: idle revs and engine toming

Postby michaeltburke » Mon, 17 Feb 2014 1:57 +0000

Now Im totally confused. It seems to run fine with the terminals permanently jumped ....maybe I should leave it that way. Chinese cars!
michaeltburke
*
 
Posts: 20
Joined: Mon, 25 Feb 2013 11:29 +0000

Re: idle revs and engine toming

Postby Steve » Mon, 17 Feb 2014 11:16 +0000

did you happen to fiddle with the ISC while doing the idle?
Troubleshooting guide is here : http://www.miata.net/garage/isc.html
Steve
Site Admin

User avatar
 
Posts: 5510
Joined: Wed, 05 Mar 2008 10:16 +0000

Re: idle revs and engine toming

Postby michaeltburke » Mon, 17 Feb 2014 11:50 +0000

No Steve, I did not touch the ISC , just kept the process simple following a proceedure outlined on quite a few web sites.The jumped idle revs can be set at 850. When the jumper is removed they always drop to 500 or so . I cannot close that gap as there is always about 300 revs between jumped and non jumped. If I adjust the unjumped revs to 850 they become slow to return there when the engine returns to idle from high revs. If left jumped things seem fine. By jumped I mean connecting 10 and GND.
michaeltburke
*
 
Posts: 20
Joined: Mon, 25 Feb 2013 11:29 +0000

Return to How do I....

Who is online

Users browsing this forum: Google [Bot] and 3 guests

cron