• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Not able to accelerate after about 25 to 30


85_Ranger4x4

Forum Staff Member
Forum Moderator
Article Contributor
V8 Engine Swap
OTOTM Winner
TRS Banner 2010-2011
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 7, 2007
Messages
27,796
Reaction score
8,280
Points
113
Location
SW Iowa
Vehicle Year
1985
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Manual
A '96 F-150 with the factory cam IS NOT a HO firing order.

 


Rock Auto 5% Discount Code: F9A1A579ACFAD1: October 1st, 2021
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
It has a roller cam in it, was the same when I got it from the dude, only changed a collapsed lifter and my pushrods
 

85_Ranger4x4

Forum Staff Member
Forum Moderator
Article Contributor
V8 Engine Swap
OTOTM Winner
TRS Banner 2010-2011
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 7, 2007
Messages
27,796
Reaction score
8,280
Points
113
Location
SW Iowa
Vehicle Year
1985
Make / Model
Ford
Engine Type
V8
Engine Size
5.0
Transmission
Manual
It has a roller cam in it, was the same when I got it from the dude, only changed a collapsed lifter and my pushrods
Roller is just roller, they came in both flavors.
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
I'll try the other firing order an see what goes down, when I was first tryna fire it up I tried both orders and it sounded off time on the non ho order, and turned over fine with the ho one
 

RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
20,155
Reaction score
3,963
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Then I would stick with HO firing order it would barely idle with wrong firing order

As said this is strictly a CAM issue, it sets the firing order you use, i.e. does the intake valve on #3 or #5 open after #1's intake valve, either way works, its just how the cam was cut when it was made
There is no benefit in either firing order over the other, just depends on the cam that was used in that 302 V8
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
Im gonna do some rewiring for the injectors an see if that's gonna help
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
I'm hoping it's something easy to fix, it's almost all done, then improvements will be made to it
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
Injectors all get 12volts with key on from a wire they all share
Computer has one ground wire for each injector to open it, sequential injection, follows the firing order

Earlier EFI computers did use Batch Fire, just 2 computer grounds each opening 3 injectors(V6) or 4 injectors(V8)

V6 engine wiring would only have 6 injector plugins, V8 computer would have 2 extra
Look at the original injector wires
There would be a red wire on each thats the 12v
If each injector has a different color Ground wire(6 colors) then its a Sequential injection harness
If there are just 2 colors shared then its Batch Fire harness

Mustang V8 wiring here: https://www.stangnet.com/mustang-forums/attachments/88-91_5-0_eec_wiring_diagram-gif.113534/

It has the 8 different wire colors for injector grounds

You could add those 2 extra wires to computer connector

302 has this firing order, applies to injectors as well as spark plugs, 1 5 4 2 6 3 7 8

1 thru 6 wires should be there, just in the wrong places if still in the V6 harness tape
1, 2 and 3 would be on the passenger side and correct, but 4 would have to be moved to passenger side rear injector
Then 5 and 6 at the front of drivers side
7 could be hooked to 6 and then 8 to 3

But I doubt thats your issue
So if I rewire the injectors in a proper layout its 1-3 already good to go, 4 needs to be extended and moved to the back and 5 an 6 get moved onto what would be 5 an 6 injectors, would 7 branch from 6 an what about 8
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
Injectors all get 12volts with key on from a wire they all share
Computer has one ground wire for each injector to open it, sequential injection, follows the firing order

Earlier EFI computers did use Batch Fire, just 2 computer grounds each opening 3 injectors(V6) or 4 injectors(V8)

V6 engine wiring would only have 6 injector plugins, V8 computer would have 2 extra
Look at the original injector wires
There would be a red wire on each thats the 12v
If each injector has a different color Ground wire(6 colors) then its a Sequential injection harness
If there are just 2 colors shared then its Batch Fire harness

Mustang V8 wiring here: https://www.stangnet.com/mustang-forums/attachments/88-91_5-0_eec_wiring_diagram-gif.113534/

It has the 8 different wire colors for injector grounds

You could add those 2 extra wires to computer connector

302 has this firing order, applies to injectors as well as spark plugs, 1 5 4 2 6 3 7 8

1 thru 6 wires should be there, just in the wrong places if still in the V6 harness tape
1, 2 and 3 would be on the passenger side and correct, but 4 would have to be moved to passenger side rear injector
Then 5 and 6 at the front of drivers side
7 could be hooked to 6 and then 8 to 3

But I doubt thats your issue
Its setup to be batch fire from the v6 currently and I'm pretty sure the comp I have is batch fire as well
 

RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
20,155
Reaction score
3,963
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Yes, you would need to know what the computer was programed for, regular or HO 302 firing order for sequential injection

But if its Batch fire then Ford used this injector map for "most V8s"
1 4 5 8 injectors on one ground wire, 2 3 6 7 on the other ground wire

Generally Ford with use a Tan wire for #1 and White wire for #2 on Batch fire
These wires come from pins 58 and 59 on computer

And if its a Batch Fire computer, then its probably running Speed Density software so needs a MAP sensor instead of a MAF sensor
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
Yes, you would need to know what the computer was programed for, regular or HO 302 firing order for sequential injection

But if its Batch fire then Ford used this injector map for "most V8s"
1 4 5 8 injectors on one ground wire, 2 3 6 7 on the other ground wire

Generally Ford with use a Tan wire for #1 and White wire for #2 on Batch fire
These wires come from pins 58 and 59 on computer

And if its a Batch Fire computer, then its probably running Speed Density software so needs a MAP sensor instead of a MAF sensor
I did some swapping on the injectors and it feels rougher than before I moved the 4th injector wire onto the passenger an wired the 7th to the 6.th and the 8 to the 3, but on the v6 harness seems to be wired as a batch with 1 an 2 firing with one from the other side and 3 firing with the other 2 from the drivers , I'm gonna prolly go score a 2.9l harness from the jy
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
I have the f150 map sensor and it runs terrible with that not hooked up
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
The idle when I push the clutch in when moving down the road after it starts chugging or losing 2 cylinders Is what I think, it's dropped down to like 800 or lower not entirely sure but it feels rougher running now than before as well
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
Yes, you would need to know what the computer was programed for, regular or HO 302 firing order for sequential injection

But if its Batch fire then Ford used this injector map for "most V8s"
1 4 5 8 injectors on one ground wire, 2 3 6 7 on the other ground wire

Generally Ford with use a Tan wire for #1 and White wire for #2 on Batch fire
These wires come from pins 58 and 59 on computer

And if its a Batch Fire computer, then its probably running Speed Density software so needs a MAP sensor instead of a MAF sensor
Is sequential fuel specific for ho motors?
 
Joined
May 27, 2021
Messages
58
Reaction score
4
Points
8
Location
oklahoma
Vehicle Year
1991
Make / Model
Ford Ranger XLT
Transmission
Manual
Upon inspection the v6 harness has the first 2 injectors wire together and then the 3 isnt tan but white an wraps to the other wire junction and 2 on the drivers are white and one tan the tan on the drivers wraps back to the first 2 injectors,1,2,4 are tan and 3,5,6 are white but as i was working I found a wire not connected am gonna fix that and check it out from there
 


Top