5.0 on truck missing

[blk93notch]

my cousin bought a 94 f150 from a guy at work and its missing pretty bad. they guy that he bought it off said that the old 5.0 took a crap and he replaced it with a shortblock from a carbed 302. ive replaced the plugs and tried to set the timming but its still running like crap. it smoothes out alot when the rpm's go up. it has no power at all. im stumped. any ideas?

[1992MustangDW]

are the firing orders diffrent from an 5.0 h.o to a regular 5.0?

[Johnson1134]

they are different but i dont know what they are?someone on here will know!

[mustang3091]

Firing order for a H.O. is 1-3-7-2-6-5-4-8.Firing order for Non H.O is 1-5-4-2-6-3-7-8.Hope this helps you

[1992MustangDW]

I was just thinking maybe thats what was wrong with it, Mine was backwards a long time ago had no power but cleared out a little in the rpm's

[blk93notch]

i have tried bith firing orders. the ho will run and the non ho wont fire at all. they put the fuel injection back on the truck if that helps.

[k062693w]

Not a fuel injection expert, But if the FI is for an HO and it's not one wouldn't the injectors be firing in the wrong order ??? And vice versa..

[mustang3091]

Did they put the right ecm back in it and checks for grounds being not connected by the ecm

[Adam@S&MMotorsports]

Not a fuel injection expert, But if the FI is for an HO and it's not one wouldn't the injectors be firing in the wrong order ??? And vice versa..

Yup you would have to tune it on the Non H.O. firing order for the injectors and switch the plug wires on the cap for the ignition.

[blk93notch]

they did put the ecm back in but i havent checked the grounds yet. i dont hing they even touched the ecm at all.



thats a good point aaron i didnt think of that

[blk93notch]

how would i tune it for the injectors and would i wire the cap for the non ho? i tried the non h0 firing order and it would turn over but not fire.

[k062693w]

I'll call you Matt

[blk93notch]

thanks aaron. it should be fun tommorrow. lol

[mustang3091]

Pm me your number and will see if i can help you out.

[mustang3091]

Where is bridge port i have a computer that i can hook up to it and tell you what is wrong.

[blk93notch]

bridgeport is right next to wheeling wv. we have a scanner at work but cant find the port at all.

[k062693w]

If it's a 94 it should be under the dash on the left hand side.. It's a small port, not like the one on newer vehicles.. At least that's where it was on my 94..

[1992MustangDW]

also check the orange fround coming off of the injector harness needs to be grounded to the motor.

[facemelter71]

There were plenty of roller and non roller 302's that were carbed.sounds to me like you have a non roller block with a fuel injected roller firing order.

[blk93notch]

tried the 2 different firing orders and nothing. cant find the port either lol. ill check the ground

[mustang8998]

One word, cam.

If it's a H.O. block, the cam is different. Changing the firing order, won't work. Your computer is sending non-H.O. firing for the injectors. So, timing is all wrong anyway.

[blk93notch]

its not a ho block. the engine came out of mid 80's truck. but the firing order that is on the sticker under the hood is the ho firing order. if i have the ho order it will start up and run there but over loads with fuel and misses.

if its the cam is there anything i can do to solve this without switching cams or breaking the bank.

[mustang8998]

Okay, flip what I said then.

Non-H.O. block, H.O. firing order for injectors. Timing is still off!

[k062693w]

SEE I TOLD YOU MATT !!!! LOL

[blk93notch]

i understand what you are saying but im having a senior moment today. im just trying to figure out what i can do. would switching the injector firing order to non ho firing order work? or could it just be 180 out?

[blk93notch]

ok i just read it again. never mind.. im going to reroute the injector firing.

yea aaron you are the ford god right now. lol

[k062693w]

ok i just read it again. never mind.. im going to reroute the injector firing.

yea aaron you are the ford god right now. lol

More of a JESTER if you ask me !!!! :lol:

[facemelter71]

There were plenty of roller and non roller 302's that were carbed.sounds to me like you have a non roller block with a fuel injected roller firing order.

No,I didnt already say it???????????:bigthumb

[mrstang-gt-46]

check compression