I just bought and wired up a New Sensor and it is starting to give my tiny backfires. It runs like a top without the O2 Sensor. What is wrong??/
bad wiring; blown ecu op-amps; bad grounds
variable crankshaft timing or bad timing.
you can use the boost gauge or mfa to test idle hg.
warm: 195F operating temps (no less!)
840rpm idle @ 260/268 cam 12hg
840rpm idle @ 260 cam about 13-14hg
840rpm idle @ stock cam 15hg
or use a timing gun.
example of bad timing is 5-9hg at idle; will fart alot and lower idle and loss of power.
too much timing will ping (broken pistons!), and the idle will surge up/down up/down;
I just feel it out on a warm day using my ears and the idle hg and set it up for 6-7BTDC.
variable crankshaft keyway would be really bad; i'd inspect for that.
my idle goes up & down Up & down sometimes right after I start it but it has been less pronouned lately.
Which setting is the idle Hg? and are you saying to get the car to warm temps then check? My temp gauge stays right in the middle, is that 195F?