on my 1985 f250 351w carburated truck, Should I have a OBD system? If so which one, what would it look like. I'v looked in the eng. compartment and under dash but can't find anything that shouts out "OBD" hardware! Any help will be appreciaed.

Also, I believe I have a duraspark II ignition sysstem, but how can I tell for sure?

Thanks,
Chuck M.

 

You should have the HO engine - the one with the Holley/Autolite 4bbl. If so then you have DS-II and no computer so no OBD or codes. The DS-II module should have a blue grommet where the wires come out of it.

 

Thanks for clearing that up. I'v been working out of a Haynes manual for 1980-1996 trucks and Broncos and there is a ton of extra stuff that doesn't apply to this truck. Even the electrical diagrams seem to be doubled up with sensors and devices that don't exist in carburated engines.
I get confused enough with what I do have, don't need to spend time on what isn't even here.

 

You have one of the simple setups.