possilbe casue
Thread Starter
Instructor
Joined: Jun 2010
Posts: 165
Likes: 0
From: concord ohio
possilbe casue
1978 w/ cruise control. Speedometer works when I first start driving and then goes dead in about 3-5 miles. I was thinking transducer? The cruise control hasn't worked in a few years but the speedo always did. I would prefer to replace the transducer instead on running the one piece cable. Any thoughts?
thanks,
thanks,
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
Disconnect the upper cable from the cruise transducer and hook the drill up. If the speedo works fine, hook the cable back up and disconnect from the trans- or get another cable and plug that into the transducer and run it from there.
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Lube bottom cable with graphite, light oil or grease. Pull cable" all the way out" with needle nose pliers. Make sure both ends are still square, lube it and slide it back in. Upper cable requires disconnecting it from speedometer to lube. See it helps. Car can stay on ground. If ends are rounding transducer could be binding hot. A small philips screwdriver will spin transducer it should spin freely, with or without upper cable attached, if it doesn't transducer is faulty. When speedometer stops would be best time to check it. There still a chance speedometer gear is worn, because car has to raised to check it; I would check last if everything else checked ok.
