High Idle

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High Idle; diagnosing high idle
Topic Started: Oct 6 2009, 09:43 AM (537 Views)
pancakeron	Oct 6 2009, 09:43 AM Post #1
New Member Posts: 45 Group: Members Member #819 Joined: Jun 1, 2009 Location Oakland, CA. Year/Make/Model '93 Geo Metro Convertible	My 93'vert had a problem awhile back, it wouldn't pass CA smog test, (couldnt get the idle speed down, and it was running way too rich...). I did a lot of reading... through the manuals, chiltons, haynes, geo shop manuals. and on the web, looking for answers, suggestions, etc... That's where/when i discovered a few different metro/geo related forums, including this site! (geometroforum.com) by far the best site for any/all metro owners My clutch went out at the same time, so, ultimately i ended up rebuilding my engine, along with clutch/flywheel change, and etc.... The cause of my High Idle situation, turned out to be a plugged coolant hose see the pics below... the hose labeled #3 was plugged up with radiator "stop leak" products, sediment, and etc..., as were the water passage in the intake manifold leading to the #3 hose, and the water passage in the TBI, from the #3 hose, to the (thermostatically controlled) IDLE AIR CONTROL VALVE & COOLANT TEMPERATURE SENSOR... No coolant flowing, causes the valve to remain closed...(auto-choke) in cold engine mode... Both the valve and the temp sensor never "warm up" so the ECM never gets out of the "COLD ENGINE" mode, (forcing a "rich fuel mixture"/"auto-choke") operation. RESULTS= POOR FUEL EFFICIENCY and HIGH IDLE. Since the rebuild, My engine, etc has been running better than ever, primarily due to the excellent info, suggestions, and etc... found on this forum/website!. Hopefully the responses i have been able to post can/will be of some help to others as well! (with corrections or whatever pointed out if or as necessary...of course!) Enjoy, and Good Luck!



Bad Bent	Oct 6 2009, 12:37 PM Post #2
Facetious Educated Donkey Posts: 2,734 Group: Moderator Member #334 Joined: Dec 26, 2008 Location Native of SoCal, existing in McCall, Idaho Year/Make/Model 1991 and 1996 Geo Metros	Nice pictures pancakeron! Excellent diagnosis. I don't see much corrosion build up in my hoses but we never know what abuse the previous owner did, eh. Woodie I would have said the same but it's a'91 and I have one of those that does not have an ICM. Good suggestion though if there is one....



Mr Murf 59	Oct 7 2009, 04:39 AM Post #3
Looking like a lost Irish tourist Posts: 1,799 Group: Tech Certified Member #928 Joined: Jul 2, 2009 Location Humboldt Co. CA Year/Make/Model 94 Geo Metro 1.0L, 99 Chevy Metro 1.0L both 5spds	Nice pics Ron. Always start with the most likely candidate. Vacuum Webb may have hit it right on the head the first time. If not then start at the top of those fine lists and start to eliminate them.



dayle1960	Dec 6 2009, 06:48 PM Post #4
dayle1960 Posts: 34 Group: Members Member #831 Joined: Jun 3, 2009 Location Bella Vista, Arkansas Year/Make/Model 1996 Geo Metro 3 cyl 5spd 1991 4dr 3cyl 5spd	I think this needs to become a sticky!!!!



Johnny Mullet	Dec 6 2009, 09:35 PM Post #5
"Mullet of Ox" Posts: 4,704 Group: Admins Member #1 Joined: Sep 7, 2008 Location Ashtabula, Ohio Year/Make/Model 97 & 98 Metro	I split this from the other thread and moved it to the Guides/How To section.



PA.metro,fixer,frames,ect	Dec 6 2009, 11:11 PM Post #6
Frame Fixer Posts: 207 Group: Valued Members Member #642 Joined: Apr 3, 2009 Location mercer,PA.16137 Year/Make/Model 90,92,94,98,buy sell drive, fix ,many here	nice pics and info



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