Hi, I have a 92 Explorer 4 wheel drive and i am not getting fire at cylinder 5. I pulled the plug when the truck is running and i am getting spark but the engine does not change.I have new wires and plugs also.Could a bad injector cause this?What should i check for?Can the injectors be tested with a ohm meter? Thanks

I am also getting the codes 112,122 and 212 Could any of theses cause #5 not to be firing?Thanks

Yep, a misfire can be caused by lack of spark, improper air/fuel ratio, or low compression. You can probably borrow a noid light set from your local auto parts store. These are used to verify that the injector is getting a pulse to activate. You can also use an ohmmeter to get an idea if the injector is short circuited or open circuit, but I don't have the specification on what the proper resistance range should be. Probably in the neighborhood of a few ohms.

While at the auto parts store to borrow the noid light set, see if they have a compression tester that you can use to measure the compression.

-Rod

I am pulling the plenum but what size torx or whatever they are are the bolts that hold the 2nd part of the plenum together? Thanks

yes you change the injector thats about all you can do for that.