marlyman

so i blew up my engine out of this 89 gt - was guna junk it but my room mate (right 4 he got arrested) had bought a completely rebuilt 5.0 engine (fresh never turned over) from some dude that workd at a car shop - now my roomate (b4 he got arrested) was goin to put this block into a 66 stang and im pretty sure he said the engine was from an 86GT - so my roomy went to jail :-) i bought the engine thinking it would go in easier in my 89 than his 66 -It came stock head 2 oil pan an had a non-egr lower intake with 4 barrel carb (rebuild was ment for a classic that doesnt need smog)- I have it in my 89 now and i will eventually need to smog it so i took all myintake / fuel injection and front accesories from my old 89 an put them on this new block - everything has gone smoothely so far - i go to start it and it runs but won't idle an it runs ruff - i realized when i set my valves that i used my old chilton manual for the firing order - which is an 89's firing order DOH! like i said it does run - kinda :-) - SSSSOOOO my question is is my problem the firing order and all i gotta do is set the valves using the right firing order? OR do i have to replace the CAM with a defferent one?? i bring up the cam because i've been told that the cams are different between 86 and 89 because 87 was the first year of fuel injection? basically i want to run this engine fuel injected and im really really really hoping i don't have to go carburated, and if worst things would i be able to just take out the CAM that only works on carb and replace it with a newer cam that is compatible with fuel injection? supposedly motor was completely stock heads to oilpan ...so if anyone could help i would sincerely appreciate it! thanks for your time.

mjr46

85-95 are roller cam blocks and all carry an h.o/351 firing order = 13726548.....you will need to have firing order in the correct sequence and the cam needs to carry that firing order so that the SEFI = SEQUENTIAL ELECTRONIC FUEL INJECTION can fire injectors arrording to h.o sequence

marlyman

I called autozone an asked for the firing order off an 86 gt 5.0 an they told me "1542378" i guess 88is when it changes to "13726548" um i really dont want to change my cam - an what you were saying is that i need a cam that has a 13726548 firing order to work with the fuel injection???? -autozone said the 86gt5.0 came with fuel injection cam so i'm hoping i could just reset my valves and spark plugs on distributer to 1542378 ..my computer tho i didnt think of that ->being the firing order is different on 86GT -u think I would need to not only reset the valves an sparkplugs but i need a computer off an 86GT aswell??? so that makes another (stupid)question : is there a difference between 86gt & 89gt's computr or r they compatible???

jtmustang

mjr is right dude dont listen to some schmuck from autozone...it is 13726548 firing order if the motor is an 86 motor built with the correct ho roller cam=13726548 firing order

are u sure valves are adjusted right...stock valvetrain?

set the tps,o2 sensors good..

did u check for any codes?