Identifying Sensors - 1993 Geo Metro 3 cyl TBI 5 speed

[Woodie83]

That's a coolant temperature sensor for air conditioning. Most cars have it, only A/C cars have it connected.

[dags123]

on the title of the thread it should say92 ge metro ""XFI"" not tbi lol...
thank you for your reply so much. i asked this in another forum and was told dont worry about it get a beer.lol. any how now the big question as i thought the same thing.(coolant sensor)
a xfi never had ac sssoooo ,could it be said this is not a xfi..i had questioned wether i had a swaped engine because i had 195 psi on all cylenders.(cherry)i did compression tests on like 10 cars this month to finally choose this one.did full tune up . has alot better power now but my best 100% highway is only 48 mpg far from xfi mpg i thought id get..do i need to do that rolling test to test gearing(engine makes 2 full revolutions an d after marking the tires the tires should go areoun almost but not a full revolution) i thinki gotthat right
or can i check id on the engine block number.(what numbers do i look for)

thank you alot for your reply. your further insight is greatly antisipated..have a GREAT day ,,,,,,,,,,,,,,bill

[Woodie83]

It's very possible that XFIs had that sensor too, sometimes it's cheaper to just build them all the same even if a couple of parts aren't going to be used in that particular car. My XFI got 52 mpg with the timing advanced, 35 psi in the tires, and a lot of highway in the mix. 48 isn't far off from that when you consider that every car, driver, and road is different. A lot of people you see quoting mileage are running dangerous air pressures and unrealistic driving practices like pulse and glide or 50 mph. 48 is far above what any car available today will do, not bad with an 18 year old car.