Not exactly a mustang but still same general idea.
93 5.0 in f150 ate a plug, broke a valve and scratched up cyl wall on top of that cam was all scratched up.
I got a 95 5.0 out of another truck. Refreshed block new bearings rods/mains all new seals and head gaskets ford racing lifters and a timing set.
I was not aware they changed firing order after 93. Almost every where said it was old firing order. So it misses on 4&5. Plug 4 is soaked and 5 is dry.
Do i have to get a 93 cam or just get a pcm out of a 95? Any ideas? I am asking this here figuring it was same idea of a ho cam into a non ho 5.0 if it was just a pcm and plug wire change needed.
Sorry to ask here but f150.net was more interested in dizzy cam gear and wanting more info even tho i listed every thing i did. I listed how and when i changed out the broken dizzy so i wouldnt loose time with lifters and chain off of block, Even down to compression test with pics.
Sorry so long but any ideas or help would be appricated.
If you wanted to do this the hard way....you could just run the injectors according to the new firing order. Rewire the injectors to fire in the new sequence ....and move the plug wires to correspond. The computer has no way to know which camshaft is in it or the firing order. There are two types of fuel injector firing....batch fire....and sequential. If your intake says SEFI on it then its sequential and the injector wires need to be swapped to the new firing order. If it doesn't say SEFI then its batch fire....meaning the injectors fire in sets. The injector wiring can still be swapped around and should have the same affect.
I've done this before when installing a mustang 5.0 in a 90s f150. Truck ran great with the 5.0 HO.
I do understand sequence and batch fires but it doesnt hurt to add that info in especially when figuring out a issue such as this.
I can pick up a 95 5.0 pcm out of another truck for $25 from a yard. I am hoping the 93 and 95 harness is the same and it was just different pcm program. If for some reason it doesnt work i will just rewire. Thankfully i have the old injector harness that came on the 95 motor.
This was compression on 5&4 so cam timing had to be lined up correctly.
Besides the injectors, make sure the plug wires are in the new firing order.
If it is batch fire EFI, (all injectors squirting at once per cycle), injector timing is not an issue between the HO and regular cams.
If it fires each injector in sequence Like it fires the spark plugs, make sure the plug wires are in the new order, and change the wires to the right injector order, too. Solder and shrink wrap any extensions for best results. Butt end connectors can get water in them under the hood and cause issues.
I am not familiar enough with the truck computers to know when they did what, except it seems the systems were behind the cars, like when they ditched carbs for EFI.
If it was mine, I’d use the sensors, EFI computer and all, and wiring that came with the truck. I’d just change the firing order and swap the two injector’s wiring. We did that type of swap on a 460 my dad towed with, and sold the extra parts off the newish take out engine on flea bay.
There is another current post about an engine swap, HO and not H.O. that is talking about O2 sensors and computer swaps.It has bigger problems, but some of the info overlaps. After reading it, you might want to tag or PM Mustang5L5 about this to be sure.
I have a 85' mustang with 88' sd efi. Acquired another engine for it recently; 30 over pistons, edelbrock performer heads, cobra upper and lower, 1.6 roller rockers, and a trickflow stage 2 cam. The cam is a non H.O. firing order so I've already done my homework for this fix, change to non H.O...
95 automatic f150 5.0 is maf 02 sensors and sequential injectors.
95 f150 mt 5.0 is bank fire and map sensor.
1-5-4-2-6-3-7-8 is old 93 order. 1-3-7-2-6-5-4-8 is new 95 order i just swaped 5&3 4&7 injector trigger wires along with 95 plug wire firing order and kept 93 pcm. No issues with 02 sensor on 93 because their is only 1 sensor before the cat so it controls both banks the same as before. I appriciate all the help and info. Hope this might help some others even tho its a f150 and not a mustang.
No problem. I hope this and the pics of diagrams i put up will be able to help others.
I went to see if i could use the harness that came off the 95 motor i had. Then it hit me when the trigger wire was not tan or white. Idk why i didnt see it or think it before but bank fire injectors only use 2 diff colors for trigger. Sequential is different color trigger wire for each injector. At least on the f series of this era.