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Registered
Join Date: Jan 2005
Location: Canada
Posts: 73
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Arggg! More 81 sc problems
So I hear back from a friend who is doing some upholstery on my new to me 81 sc that the car has developped a poor idle. Where as last week the car made a 1200 mile journey from California to Canada without issue (other then an intermittent no start problem - heat soaked starter) it has now seen the idle drop from a rock solid / steady 900 to a rough 650 rpms.
Nothing has changed. Any ideas where to start or resources ie books to help troubleshoot? Should we check with a vacuum gague for leaks? other then idle he reports car is still pretty strong throughout the rev-band. |
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02-28-2005, 01:49 PM
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JOT MON ABBR OTH
Join Date: Feb 2001
Location: USA
Posts: 3,238
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Is the car cold (less than 50 degree F) when it is starting? I wonder if the Warm Up Regulator might be a culprit. In hot climate it might not have mattered so much or even been noticed.
I'm hoping an expert tips their hat in here...
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David '83 SC Targa (sold  ) MANLY babyblue honda '00 F250 7.3L (MINE!)'15 F250 Gas (Her Baby) '95 993 (sold )I don't take scalps. I'm civilized like white man now, I shoot man in back. |
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02-28-2005, 02:05 PM
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Hopelessly Addicted
Join Date: Jan 2003
Location: Central PA
Posts: 314
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Same thing happened suddenly to me last year. Warm up regulator was the culprit. Vacuum leak could show same symptoms.
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'81 SC Targa '86 944 '49 Ford F-3 '13 Yamaha FZ-1 (Adrenaline Machine) 
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02-28-2005, 03:21 PM
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what is the elevation change? my 75 car needed a mixture adjust when it gained 3500 feet from cali to texas.
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poof! gone |
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02-28-2005, 05:30 PM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,463
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the oxygen sensor relay may be bad, or it's power source has blown a fuse. it's the same fuse as the dome lights. the relay is under the front of the passenger seat, by the tunnel. when you pull off it's plug on a normally good running, warmed up car, the idle drops off as you described. do that test. listen for the idle to fall off.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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02-28-2005, 06:34 PM
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