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help with an idle problem

925 views 23 replies 9 participants last post by  Downshift 
#1 ·
Put a motor in a buddys miata(92 1.6). Car runs perfect but won't idle right. I tried to jump the diagnostic box pins but nothing changed. It idles anywhere between 1500 and 2000 now. No vacuum leaks....nothing. Any help would be awesome. Thanks
 
#4 ·
Idle adjustmant screw is all the way in and there is a tiny hint of slack in the throttle cable. Something is wrong somewhere I just can't figure it out. Thanks for the quick replies. If you can come up with something else I would be grateful.
 
#6 ·
If your idle adjustment screw is screwed all the way down you more than likely have a vacuum leak. I have my Idle adjustment screw all the ways down to keep the idle down cause of my vacuum leaks. I would use starter fluid or wd40 and spray short bursts around the gasket areas. If idle changes you found your vacuume leak. Just becareful with any sort of spark or flames.
 
#9 ·
Have you tried messing with the Idle adjustment screw? Open it up and see if it helps. Another possibility could be your Idle Speed Control valve could have gone bad but thats rare.
 
#11 ·
First. I did the "click" test on the isc valve. Failed that test so I'm going to put a new one of those on tomorrow. Still can't figure out why the diagnostic box won't work. And my next question. What is the "map" so I can check that out as well.
 
#13 ·
Yea I took the afm off and cleaned the piss out of the flapped door and all that jazz already. And cleaned the throttle body up too. Still can't figure it out. Also I traced all the wires back as far as I could on the diagnostic box. Nothing looked melted, burnt, pulled, or broken. Can't seem to get any of the pins to work no matter how you jump them
 
#22 ·
Did you check if the TPS its self is working correctly? I would also swap your afm with a known good one just to make sure its good.
 
#23 ·
when i get off tonight ill pull my afm off and see if it helps his car. and i have not yet checked the tps itself. doing that later tonight also. thanks for all the great info on this so far. its annoying having the car idle at 2000/1500 all the time.
 
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