O2 sensor test.

[85MercPark]

Is there a way to test them? Not getting a code for it...

How hard are they to change on a Mark 7?

They are a maint. item so I may just change them...

Does a LOPO Mark have 1 or 2?

[mrltd]

Yes
Same as any car, somewhat of a PITA.
ALL SEFI cars have 2.

[85MercPark]

Yes

How mighst I doeth that?

[mrltd]

check the voltage out of the sensor. It should be moving constantly

I'd suggest getting the EFI bible.
http://www.amazon.com/s/ref=nb_ss_gw...fuel+injection

I have the first two, and there is another version of the Pobst book that covers 1988+

here's some info on o2 sensors.

http://fordfuelinjection.com/?p=31

[gadget73]

on your car, they're probably a bastard to change. I do believe you have iron manifolds with the sensor at the back of the manifold, just like a panther. HO cars have them in the H pipe, and you can get better access to them to add heat as needed to pop them loose. The 225k mile sensors on my Mark came out pretty easy once they got a little torch treatment.

[chitownvic]

They also sell an O2 sensor socket thats very nice, they make long and short ones

[tim marks]

if you are going to replace them for sure sometimes its easier to cut the wire off the sensor and get at it with a 6 sided socket and plenty of PB blaster....sometimes the sensor sockets can be a real pain on stuck sensors that are prone to rounding off, then you are up the creek.....

[85MercPark]

Perhaps I will just wait till I throw the headers on it...