hello
i changed the motor on my 94 f15o with 5.0/302. The motor i put in it is a 87 model that was converted over to 4 brl carb and was rebuilt 50,000 miles ago. i put my intake and other parts on it after i installed it. now the motor is missing, backfiring and doesn't have any power. i have checked over and over to make sure the plug wires are wired correctly, set timing to 10 deg. btdc and changed the plugs and wires. i heard the motor run before i pulled it and it ran good before. it sounds like one sounds when the plug wires are switched. please help

 

Check the firing order , you need to use the old 302 order , the 94 was a roller motor with the HO 351 firing order....Lew

 

thank you, isee that in the repair manual now. thanks for the quik response

 

Did you get her running right?

 

yeah thats what it was. i cant believe i didnt notice that before. thank you for your help

 

Glad you got it fixed....

 

What this means of course is that you have a low output 5.0 and not a HO... just so you know in case you bought it with the impression it was a HO.

 

yeah i thought since the motors looked the same that they were the same. i had planned on rebuilding the old motor and putting it back in anyway. will there be a big differance in HP?

 

Your losing about 20 hp , the 94 wasn't an HO but it did have a decent roller cam , could of had MAF to ....