To find the intake air source just remove the intake hoses from the TB (both main and idle air). Cap off or plug the TB's idle air inlet first. If that makes the engine stall then then the IAC is bad or isn't being driven by the ECU*. If the engine doesn't stall at that point, cap off the main TB air inlet using a suitable-size jar lid with a soft rubber seal (either molded-in seal or a separate gasket. If the engine stalls at that point the air is leaking around the butterfly. If it doesn't, you'll be able to hear where the air is leaking into the manifold. * There were two IAC suppliers and one of them provided a unit that defaults to high idle if the electrical drive system fails. The other provided a unit that defaults to the engine-stall position. ----- Original Message ----- From: [email protected] To: Ben Gleason Cc: [email protected] ; [email protected] Sent: Thursday, May 06, 2010 6:29 AM Subject: Re: 94 turbo Miata with high erratic idle
Guys, couple of other datapoints: Unplugging IAC it holds steady around 1500-1800 Plenty of vacuum to MAP box Keypad reads MAP correctly, something like 30ish at high idle, builds 15-17psi at WOT Idle adjustment screw doesn't do much of anything, it's about 1 turn from fully closed Idle switch is perfectly set, flips * at slight throttle touch I believe keypad reads 45% on idle screen (not sure that I remeember right but I think that was it). ECU chip is not newest, maybe 2 years from newest one I believe but when I looked it up the revisions really didn't seem to matter Wallyman Ben Gleason <[email protected]> Ben Gleason <[email protected]> Sent by: [email protected] 05/06/2010 09:19 AM To "[email protected]" <[email protected]> cc Subject 94 turbo Miata with high erratic idle I have a 94 turbo Miata with the Link ECU that has always had a high idle since I purchased it late last summer, but recently that high idle is now erratic and it bounces from 1900 to 2100 rpm (fuel cut off I believe) My friends and I cannot find a vacuum leak, and believe the IAC is working properly. Does anyone have any ideas how I can fix this annoying and embarrassing problem? Thank you, Ben _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower ------------------------------------------------------------------------------ _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
<<graycol.gif>>
<<ecblank.gif>>
_______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
