1987 ford E350 460 7.5L backfires
acquired a 87' E350 econoline w/ 460 7.5L EFI cab over motorhome. this thing sat for some time owner told me "the fuel pump needed to be replaced, parts are there" replaced parts given (fuel pump, ...
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Shortlist for that engine, been there done that.
1. New sparkplugs
2. New plug wires, distributor cap, rotor- went with MSD, low resistance wires
3. New ignition module (yeah, it burns off, pull the distributor wire off it and check- went with MSD
4. Test/replace fuel pump relay, it likes to eat them up
5. Delete Catalytic converter (to "test" -up to you what you replace it with or leave it off). As soon as you have firing issues, raw fuel dumps into the cat and clogs it. (You could disconnect exhaust pipe from the manifold on driver's side so there is about 1/4"=1/2" gap and see if it starts and stays running. If so, cat is clogged)
I've done all the testing and isolation, chased it round and round. Everything I found was fixed and now runs like new!
1. New sparkplugs
2. New plug wires, distributor cap, rotor- went with MSD, low resistance wires
3. New ignition module (yeah, it burns off, pull the distributor wire off it and check- went with MSD
4. Test/replace fuel pump relay, it likes to eat them up
5. Delete Catalytic converter (to "test" -up to you what you replace it with or leave it off). As soon as you have firing issues, raw fuel dumps into the cat and clogs it. (You could disconnect exhaust pipe from the manifold on driver's side so there is about 1/4"=1/2" gap and see if it starts and stays running. If so, cat is clogged)
I've done all the testing and isolation, chased it round and round. Everything I found was fixed and now runs like new!
