Ok I have a 1986 Bronco I just replaced the motor with a mustang 302, after fighting with it for about three days I found another ground and grounded the motor (in the third spot) and it started, i drove it to get the exhaust hooked up and it ran fine and I drove it home and we went to time it the timing was off and it was barely turning over like before when it wasnt grounded so we cleaned up all of the grounds and moved the distributor again and it cranked hard and started up and than the headers got bright red. Turned the distributor back an eigth and it took it a little longer but they got red again. But we couldnt get it to crank in any other position, checked the exhaust coming out of the muffler and it has good pressure.............. Some one please help!!!!!!!!!!!!!!!!!!!!!

 

Sounds like the timing is retarded. Does it rev very slowly?

 

no it is actually reving very fast sounds like it is going to blow up and than when I turn it down by rotating the distributor it wont start back up it goes back to sounding like the battery is dead and barley cranks over

 

Did use the HO firing order. I believe it is different from 302 truck, but is the same as 351.

 

what would the correct firing order be should I use the truck firing order or the HO(what does this mean)????? firing order I went with the one out of the haynes manual??? do any of you suggest anything different???and if you meant reving slow as in trying to start than yes it does but once it fires it runs like a bat outa hell

 

High Output
http://www.geocities.com/cping3/late302.html

Use th HO firing order. I don't know about the injectors (or carb?). If they are seqential, they will need to be changed also. They should be fine if they are bank to bank. You may want to snoop around www.corral.net
I'm sure someone over there will know something. Also your truck is speed density if equiped with fuel injection. The HO camshaft can cause some issues for SD setups.

 

The timing for the HO and 351 are different than the 302 by enough to not make it run. I would check for a vacuum leak. Sounds like it is running very lean and this would cause the fast rev and glowing headers.

 

DO YOU KNOW.................
1. The old engine has a different fire order than the 5L Mustang.
2. The injection in the truck is 'batch fire' not sequencial.
3. The old engine is flat tappet cam, the Mustang motor is roller lifter. Not the same fire order.
4. You now have a big problem with fuel injection and fire order.
5. The ox sensor is looking to control fuel based on the 86 batch fire , now you have a different situation.
6. The fan belts are a different setup between the two motors and runs the water pump in different rotations.
Why did you not find all this out before you made the changes?
You just can't twist and turn the dist and be anywhere near correct with timing unless you are experienced. Find TDC and use a light for final timing with the Spout connector out.

 

If I changed the computer in the car would it run this motor right I do have an 86 mustang motor????????? And I check everything out with a few buddies who are good mechanics and was told it would work out now i guess i am in a jam what do you gusy suggest I can do to fix this problem, should I just take it to a tuner and have them do it?????

 

ALSO if I have already driven this truck how would it be the firing order,I am under the impression that if the firing order is wrong it wont run but I drove the truck to get the exhaust hooked up and we were using a timing light just didnt have any good results. It fires and runs just idles very high and the headers are getting bright red???????

 

If you used a roller cam motor and used the Bronco fire orfer on it, it is definately wrong.
The way around this is install a Ford motorsports Mass Air conversion kit made for that use and sort the rest of the problems out.
All the 5L 150 trucks and Broncos from 85 to 93 are batch fire, so there is no help from any of these trucks as far as parts.
I'm not trying to be a hard *** but both you and the buddys may know Mustangs but didn't know the trucks very well.
Best source of info is the Ford Fuel Injection Book by Chatles Prosbst. Cost about $30. Has all the EEC drawings and how everything works.
Good luck.

 

if i used a Mustang GT computer would this work with this setup??

 

engine, probably, everything else electrical, no, everything down to the a/c dial would most likely be off.

 

Changing the computer does not solve the problems.
Reasons why:
1. It requires mass air.
2. It requires two ox sensors.
3. Rewire for the correct injection sequence.
4. Removal of the MAP sensor function.
3. It requires changes in or replacement of the harness for the computer to incorporate these functions and changes.
All the same things the F.M. Sports kit does.

 

If you use an 86 Mustang GT computer you don't need mass air. Mass air didn't come into play until 1988. (in the stang, and its a stang motor with I assume the stang harness, er if not read below)

You need to go and get a 1986 Stang computer and harness if you don't have one. They should be cheap as 1986 was the least popular of the fox since it had the weakest HP numbers from like 1984-1993 due to crappy heads. Hook up the stang computer and harness and the engine should purrrr, but you'll still need a few other parts, like the 02 sensors etc...