5.0 Help in a truck

StangChik · 12-29-2008, 08:58 AM

I have an 86 Ford F150 with the 302 fuel injected engine. I could really use your guys help, because we cannot figure this thing out.

We put a new (used) engine in the truck a while back. It ran great, better than it ever did before. Then all of a sudden it quit and we haven't been able to get it running since. We did a full tune up on it, and its getting plenty of fuel pressure. However it will not fire consistently. When you put a timing light on it, its blinks randomly and you can get a read on it( Yes the light is good, we checked it on my cobra). So then someone told me to put a new coil on it. This made it better, but still no constant fire. Its tries to fire up, but just doesn't have enough to get it going. BTW, i also took the module off and it tested good.

I really need to figure this thing out, because we need it. And advice and suggestiong would be very helpful. There may be some other things that i left out, but hopefully someone can make sense of this. Thanks

militarymustang88gt · 12-29-2008, 09:37 AM

check the gear on the distributor. if it is ground at all or if the bearing is loose it will cause the rotar button to wobble and not hit every cylinder on the cap. just take the cap off and see if the shaft moves at all. it shouldnt and if it does it should be so minimal you would have to be paying hard core attention to it.

StangChik · 12-29-2008, 09:42 AM

well, we thought at one time it may have been a distributor problem, so we swapped it out with one from another running truck. No change and it looks ok, from what i can tell. We though about buying a new one, just to be sure. But it seems like we are spending a lot of pointless money, when we still don't know what the problem is.

militarymustang88gt · 12-29-2008, 09:54 AM

get a set of jumper cables and hook a red and black to the motor and then a red and black on the other side to the body. cause a ground issue for the motor could be the problem. that is just easy to check and everyone has jumper cables, so you dont have to find or make one and find places to bolt it up if it doesnt need one.

StangChik · 12-29-2008, 09:56 AM

ya i was thinking about ground problem at one time too, because of all the swapping we had to do. I'll look into that.

StangChik · 12-29-2008, 10:01 AM

so you just hook the cables up anywhere to the motor and the body? ANd you use both ends, pos and neg?

militarymustang88gt · 12-29-2008, 10:02 AM

or just one of them. both will ensure it is grounded good.

StangChik · 12-29-2008, 10:12 AM

k i think we are gonna try that.

Also, is there a way something could be turning backwards? I'm not sure if i understand it right, but someone said if the wires are not in the right order, it will fire backwards. But i'm pretty sure we have the firing order correct.

militarymustang88gt · 12-29-2008, 10:19 AM

is it an HO or a regular 302

casue the HO firing order is 13726548
and the regular one is 15426378

you might have an ho and have the regular firing order or vise versa.
had a problem with a crown vic motor being put in a mustang and was wondering why it was stubbling when we finally got it to crank.

EHardy1971 · 12-29-2008, 10:27 AM

Sounds like it jumped time to me.

Quote:

Originally Posted by militarymustang88gt

is it an HO or a regular 302

casue the HO firing order is 13726548
and the regular one is 15426378.

She said it ran great to begin with,so I doubt it's the firing order. On a side note,the Ford truck/van 302's started coming with the HO/351 firing order in '95.

12-29-2008, 08:58 AM	#1
StangChik Senior Member Join Date: Sep 2006 Posts: 194	5.0 Help in a truck I have an 86 Ford F150 with the 302 fuel injected engine. I could really use your guys help, because we cannot figure this thing out. We put a new (used) engine in the truck a while back. It ran great, better than it ever did before. Then all of a sudden it quit and we haven't been able to get it running since. We did a full tune up on it, and its getting plenty of fuel pressure. However it will not fire consistently. When you put a timing light on it, its blinks randomly and you can get a read on it( Yes the light is good, we checked it on my cobra). So then someone told me to put a new coil on it. This made it better, but still no constant fire. Its tries to fire up, but just doesn't have enough to get it going. BTW, i also took the module off and it tested good. I really need to figure this thing out, because we need it. And advice and suggestiong would be very helpful. There may be some other things that i left out, but hopefully someone can make sense of this. Thanks

12-29-2008, 09:37 AM	#2
militarymustang88gt Senior Member Join Date: Jun 2007 Location: bham and auburn Posts: 337	check the gear on the distributor. if it is ground at all or if the bearing is loose it will cause the rotar button to wobble and not hit every cylinder on the cap. just take the cap off and see if the shaft moves at all. it shouldnt and if it does it should be so minimal you would have to be paying hard core attention to it. __________________ finally got my avatar. it is the white one.

12-29-2008, 09:54 AM	#4
militarymustang88gt Senior Member Join Date: Jun 2007 Location: bham and auburn Posts: 337	get a set of jumper cables and hook a red and black to the motor and then a red and black on the other side to the body. cause a ground issue for the motor could be the problem. that is just easy to check and everyone has jumper cables, so you dont have to find or make one and find places to bolt it up if it doesnt need one. __________________ finally got my avatar. it is the white one.

12-29-2008, 10:02 AM	#7
militarymustang88gt Senior Member Join Date: Jun 2007 Location: bham and auburn Posts: 337	or just one of them. both will ensure it is grounded good. __________________ finally got my avatar. it is the white one.

12-29-2008, 10:19 AM	#9
militarymustang88gt Senior Member Join Date: Jun 2007 Location: bham and auburn Posts: 337	is it an HO or a regular 302 casue the HO firing order is 13726548 and the regular one is 15426378 you might have an ho and have the regular firing order or vise versa. had a problem with a crown vic motor being put in a mustang and was wondering why it was stubbling when we finally got it to crank. __________________ finally got my avatar. it is the white one.

12-29-2008, 09:42 AM	#3
StangChik Senior Member Join Date: Sep 2006 Posts: 194	well, we thought at one time it may have been a distributor problem, so we swapped it out with one from another running truck. No change and it looks ok, from what i can tell. We though about buying a new one, just to be sure. But it seems like we are spending a lot of pointless money, when we still don't know what the problem is.

12-29-2008, 09:56 AM	#5
StangChik Senior Member Join Date: Sep 2006 Posts: 194	ya i was thinking about ground problem at one time too, because of all the swapping we had to do. I'll look into that.

12-29-2008, 10:01 AM	#6
StangChik Senior Member Join Date: Sep 2006 Posts: 194	so you just hook the cables up anywhere to the motor and the body? ANd you use both ends, pos and neg?

12-29-2008, 10:12 AM	#8
StangChik Senior Member Join Date: Sep 2006 Posts: 194	k i think we are gonna try that. Also, is there a way something could be turning backwards? I'm not sure if i understand it right, but someone said if the wires are not in the right order, it will fire backwards. But i'm pretty sure we have the firing order correct.