Idling Problems

From Tune Ups to Oil Changes, maintenance related

Moderator: toayoztan

Idling Problems

Postby EvilStig » Sun Aug 13, 2017 9:56 pm

Hi there,

My ST185 isn't idling properly. Idle is supposed to be ~800-900 RPM, but most of the time when I let off the gas it drops to around 400RPM and bounces between 400 and 800 RPM for a while before either surging up to 1500RPM for a minute and then repeating the cycle, or, stalling out entirely. Has anyone dealt with this before and know what I should be looking at to fix it? My understanding is the idler is fully automatic and non adjustable on these cars, some arcane black magic mechanism?
Members don't see the above ad. Register now - it's free!
EvilStig
Club Member
 
Posts: 20
Joined: Fri Jul 28, 2017 10:57 pm
Location: California

Re: Idling Problems

Postby Celi-GT4 » Mon Aug 14, 2017 1:36 am

Check for vacuum leaks, and also the AFM? The flapper door can get gooey, also the TPS sensor is a possibility. DO you have access to another 185 that you could swap some parts? THE TPS is adjustable so I wouldn't mess with that unless you are confident you can mark the screw locations and get it back to spec. Im sure there are some speed shops that have worked on MR2 or Alltracs around you
12.4 @ 115mph Topeka Kansas NA2005
12.2 @ 109mph blew HG Moroso 1/08
Sold out, now on stock 3rd gen
Blitz ecu, dp,exhaust, tien ss, carbon driveshaft,light wheels/brakes,os giken twin plate
Celi-GT4
Club Member
 
Posts: 338
Joined: Mon Aug 09, 2004 3:45 pm
Location: Park City, Utah

Re: Idling Problems

Postby 2jzn54 » Mon Aug 14, 2017 4:23 pm

sounds like a vac leak to me. new to the platform, but vac leaks will cause the issues you referenced.. just dealt with this behavior on one of my cars the other day. vac leak caused odd idling behvior and roughness and eventually would stall if i didn't open up the throttle myself.. listen to the engine bay next time you start the car.. you'll probably hear the high pitch from the extra unmetered air getting sucked in. if you can't figure it out just get a vac leak test guage from harbor freight. gl
2jzn54
Newbie
 
Posts: 8
Joined: Mon Aug 07, 2017 6:19 pm


Return to General Maintenance and Repair

Who is online

Users browsing this forum: Google [Bot], Google Adsense [Bot] and 2 guests