Idle Speed Issue - 1975 1.8L |
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Idle Speed Issue - 1975 1.8L |
telank |
Aug 29 2016, 10:00 AM
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#1
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Newbie Group: Members Posts: 8 Joined: 23-August 15 From: Indiana Member No.: 19,091 Region Association: Upper MidWest |
I'm in need of ideas to resolve an idle speed dilemma. My 914 is a 1975 1.8L which I bought about a year ago. It seems to be very stock and still has the L Jetronic FI system in place. Here is the challenge.... I have been using the process in the Haynes manual for setting idle speed. If I set the speed when the car is warm, the next time t is started cold it is difficult to start and will idle so slow it barely stays running. Once warmed up all is good. If I set the idle speed right after starting before it is up to temperature - after it does warm up - it will be idling at over 2,000 RPM. Outside of this issue the car runs good and strong. The plugs are perfect color - so no indication of too lean or rich mixture. Thanks for your thoughts or ideas!
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Dave_Darling |
Aug 29 2016, 03:28 PM
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#2
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
The early L-jet cars had the same type of AAR as the D-jet cars did. It has a rotary valve operated by a bi-metallic coil spring that rotates as the heating element in the bottom of the can warms up. (Or as the whole thing is warmed by engine heat.)
The later L-jet cars had a disk valve rotated by a bi-metallic lever which curled/tilted when it heated up. Either one has a rotating piece, a bi-metallic temperature-sensitive piece, and a heating element. The rotating piece can be cleaned up with solvent or a good penetrating oil, and the heating element can be checked with an ohmmeter. (Should read about 10-30 ohms between the connector and the housing or between the two pins in the connector if there are two pins.) If the cleaning fails, they can be CAREFULLY opened up and more aggressive cleaning done. --DD |
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