John One wire O2 sensors located near the head in the exhaust in order to quickly heat up are the most reliable and simplest. The multi-wire have heating elements in them to allow the manufacturer to place them further downstream for wiring convenience and for things like monitoring catalytic converter efficiency. A simple sweep needle volt meter on the 1 volt scale, or read on the 1 volt scale is all you need. If you are balanced in your mixture then the needle will hover around .5 volts. If it swings towards 1 volt or keeps swinging that way you are running lean, if swinging or staying near or at 0 volts then mixture is rich. Watch when you accelerate and you will confirm this. We used a simple volt/ohm meter to check older O2 sensors all the time to save having to remove them, only to find the problem was elsewhere. This is probably also one of the only computer sensors from earlier engines that only read 1 volt or less. All others read at least 5 volts, some 12 volts. By labeling the volt gauge ahead of time, the voltage will make sense when you are reading it, and you won't spend a ton for the parts. O2 wire pigtail can be had at AutoZone or Advance Auto Parts or equivalent auto parts house as a repair pigtail for one wire O2 sensor. These are also the cheapest O2 sensors at about $18. Hardest part is getting the nut welded on the pipe. Uses a 7/8" wrench to install. Always use alittle Permatex Anti-seize to prevent it rusting in place. Spark plug torque of 20 foot pounds works good, no more. Any more might crack it internally, or ring it off.
Colin crain...@cfl.rr.com http://kr-builder.org/Colin/index.html KR2(td) N96TA Sanford, FL Apex Lending, Inc. 407-323-6960 (p) 407-557-3260 (f) crai...@apexlending.com
