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Old 60's Porsche Tech
Join Date: Jan 2009
Posts: 369
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need confirmation i think i found my mileage problem!!!
Just tested coil in 1985 carrera I hope my bentley manual is correct it says that ohms resistance between terminal 1 and 15 on the coil (primary resistance) should be
.4 - .7 ohms. I just tested it and the ohms value is 1.2. I have been getting poor mileage and every thing else tests ok. I have been chasing this for weeks, can some one check me out on this, before I break out a cold one to celebrate, thank you JL |
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02-24-2009, 06:40 PM
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I tested my new replacment coil purchased from our host. I read .4 ohms.
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02-24-2009, 07:40 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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touch your leads together, subract that from your 1.2.
i would not worry about it.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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02-25-2009, 03:22 AM
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Registered
Join Date: Sep 2005
Location: new york
Posts: 1,372
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have you changed your o2 sensor....a bad one will richen your car and affect gas milage.
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02-25-2009, 01:50 PM
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Old 60's Porsche Tech
Join Date: Jan 2009
Posts: 369
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O2 sensor was replaced when somog done 2 weeks ago, passed very clean with no adjustments, JL
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02-25-2009, 02:39 PM
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Join Date: Oct 2006
Posts: 452
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Your coil may be fine and not the issue. Did you test between terminals 1 and 4?
Resistance should be 0.4 to 0.6 ohms between terminals 1(-) & 15(+) and 650 to 790 ohms between 1(-) and 4(dist.wire term.)
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pozee |
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02-25-2009, 02:46 PM
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Old 60's Porsche Tech
Join Date: Jan 2009
Posts: 369
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You are correct the coil tested 1.2 across the two terinals however a fellow pelican reminded me to subract what the two leads on the ohm meter touched together reads which is .6 which means my true reading is .6 which is within spec, thank you JL
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02-25-2009, 03:01 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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Jl??
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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02-26-2009, 04:01 AM
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Registered
Join Date: Oct 2005
Location: Socal
Posts: 1,990
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When I first got the Pcar, I reviewed the service records and did some general stuff.
-- New plugs -- New spark plug cables -- New distributor cap -- New air filter -- New oil an filter change etc, etc.. Only thing I need now is a valve adjustment (has been too long). Maybe that would help.
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Luis "once was - Wickd89" Carrera 3.2 - "Faster, Stronger, Better" -- 2008 Toyota Camry SE V6 (mine) -- 2005 Toyota Sienna (hers) -- 1989 911 Carrera Cabriolet -SOLD |
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02-26-2009, 06:39 AM
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So what was the result? I am on a poor mileage hunt myself - yanked the Weltmeister chip and am pondering new O2 Sensor in my 86...
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86 Carrera Coupe (sold) 11 Nissan Leaf 03 Honda Civic Hybrid 91 ELECTRIC Kawasaki ZX-11 |
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01-25-2010, 08:39 PM
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The Other Woman
