Cylinder 5 Not Firing

[onerchprk]

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

[onerchprk]

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

[shorod]

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

[onerchprk]

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

[jacobunderwood]

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