Crank, no start. please help
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
Crank, no start. please help
Sorry for the long post in advance. 95 f350 460
In the beginning, the battery light came along with a slow crank to intermittent no start. I had the battery and alternator checked out, all good. I replaced the starter, thinking that was it. Now, it just cranks fine but no start. Neither of the fuel pumps are turning on when I turn the key.
The fuses and relays have all checked out, the inertia switch is pressed down, I've bypassed the electrical by jumping from the battery to the fuel switch. I can hear both of the fuel pumps turn on this way, but I have zero pressure with a gauge at the fuel line. I'm not sure if this would be a fuel pump problem or not.
I went ahead and replaced the switch since I was there. I'm getting ready to replace the fuel filter and the fuel pressure regulator as a shot in the dark. I have no idea on what else to do. Any input would be greatly appreciated.
In the beginning, the battery light came along with a slow crank to intermittent no start. I had the battery and alternator checked out, all good. I replaced the starter, thinking that was it. Now, it just cranks fine but no start. Neither of the fuel pumps are turning on when I turn the key.
The fuses and relays have all checked out, the inertia switch is pressed down, I've bypassed the electrical by jumping from the battery to the fuel switch. I can hear both of the fuel pumps turn on this way, but I have zero pressure with a gauge at the fuel line. I'm not sure if this would be a fuel pump problem or not.
I went ahead and replaced the switch since I was there. I'm getting ready to replace the fuel filter and the fuel pressure regulator as a shot in the dark. I have no idea on what else to do. Any input would be greatly appreciated.
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
Just did the spark plug test, no spark. Took the ignition coil off and it tested zero ohms with multimeter. Maybe that's the issue?
Last edited by PattyCakes60; Aug 10, 2025 at 09:41 AM.
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
What can I do to further narrow this down?
Tuned
Joined: Jan 2021
Posts: 377
Likes: 81
EDIT: Major update, Does the fuel pump run for a few seconds when you turn on the ignition? Sounds like it does not. Sounds like you checked the fuses, all of them?? How about the relay? You can swap one of the other relays as a test. Say the wiper relay, if the wiper still work and the pumps do not come on, it's not the relay, but still could be the fuse. Are you getting power to the pump(s), sounds like if you bypass the system, they are working. So, I would pull the ECU, and see what it look like inside. This can be a bit of a head ache, I loosen up the wheel cover to allow more movement.
Do you have fuel pressure at the rail? Probably not, is the pumps are not coming on at all. Remember, they will only run for a few seconds when you turn the key to the start position, you do not have to go to the crank position.
As for the no spark:
You say you tested the Coil with no resistance? Does kind of sound like the coil, but go through this Guide, It is long, but it will get you the answers you need.
https://easyautodiagnostics.com/ford...n-module-tests
If you have both no spark and no fuel, My money is on the ecu.
Do you have fuel pressure at the rail? Probably not, is the pumps are not coming on at all. Remember, they will only run for a few seconds when you turn the key to the start position, you do not have to go to the crank position.
As for the no spark:
You say you tested the Coil with no resistance? Does kind of sound like the coil, but go through this Guide, It is long, but it will get you the answers you need.
https://easyautodiagnostics.com/ford...n-module-tests
If you have both no spark and no fuel, My money is on the ecu.
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
EDIT: Major update, Does the fuel pump run for a few seconds when you turn on the ignition? Sounds like it does not. Sounds like you checked the fuses, all of them?? How about the relay? You can swap one of the other relays as a test. Say the wiper relay, if the wiper still work and the pumps do not come on, it's not the relay, but still could be the fuse. Are you getting power to the pump(s), sounds like if you bypass the system, they are working. So, I would pull the ECU, and see what it look like inside. This can be a bit of a head ache, I loosen up the wheel cover to allow more movement.
Do you have fuel pressure at the rail? Probably not, is the pumps are not coming on at all. Remember, they will only run for a few seconds when you turn the key to the start position, you do not have to go to the crank position.
As for the no spark:
You say you tested the Coil with no resistance? Does kind of sound like the coil, but go through this Guide, It is long, but it will get you the answers you need.
https://easyautodiagnostics.com/ford...n-module-tests
If you have both no spark and no fuel, My money is on the ecu.
Do you have fuel pressure at the rail? Probably not, is the pumps are not coming on at all. Remember, they will only run for a few seconds when you turn the key to the start position, you do not have to go to the crank position.
As for the no spark:
You say you tested the Coil with no resistance? Does kind of sound like the coil, but go through this Guide, It is long, but it will get you the answers you need.
https://easyautodiagnostics.com/ford...n-module-tests
If you have both no spark and no fuel, My money is on the ecu.
I pulled the ECU and nothing really looks abnormal. If I have to go this route, where would I get one from that would be reliable?
Trending Topics
Tuned
Joined: Jan 2021
Posts: 377
Likes: 81
Sure.
So, lets get the fuel flowing before we mess with anything else. When you pulled the ECU, did you open it up? Pictures by chance? often times the Capacitors will leak and cause problems you can't see from the outside.
Depending on your skill set, you can get a set of replacement capacitors and solder them in. If that is not something you are comfortable with, you will need the code off the ECU. There are several numbers, take a photo of the connector and post it so we can get you the right one.
So, lets get the fuel flowing before we mess with anything else. When you pulled the ECU, did you open it up? Pictures by chance? often times the Capacitors will leak and cause problems you can't see from the outside.
Depending on your skill set, you can get a set of replacement capacitors and solder them in. If that is not something you are comfortable with, you will need the code off the ECU. There are several numbers, take a photo of the connector and post it so we can get you the right one.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
Sure.
So, lets get the fuel flowing before we mess with anything else. When you pulled the ECU, did you open it up? Pictures by chance? often times the Capacitors will leak and cause problems you can't see from the outside.
Depending on your skill set, you can get a set of replacement capacitors and solder them in. If that is not something you are comfortable with, you will need the code off the ECU. There are several numbers, take a photo of the connector and post it so we can get you the right one.
So, lets get the fuel flowing before we mess with anything else. When you pulled the ECU, did you open it up? Pictures by chance? often times the Capacitors will leak and cause problems you can't see from the outside.
Depending on your skill set, you can get a set of replacement capacitors and solder them in. If that is not something you are comfortable with, you will need the code off the ECU. There are several numbers, take a photo of the connector and post it so we can get you the right one.
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
Sure.
So, lets get the fuel flowing before we mess with anything else. When you pulled the ECU, did you open it up? Pictures by chance? often times the Capacitors will leak and cause problems you can't see from the outside.
Depending on your skill set, you can get a set of replacement capacitors and solder them in. If that is not something you are comfortable with, you will need the code off the ECU. There are several numbers, take a photo of the connector and post it so we can get you the right one.
So, lets get the fuel flowing before we mess with anything else. When you pulled the ECU, did you open it up? Pictures by chance? often times the Capacitors will leak and cause problems you can't see from the outside.
Depending on your skill set, you can get a set of replacement capacitors and solder them in. If that is not something you are comfortable with, you will need the code off the ECU. There are several numbers, take a photo of the connector and post it so we can get you the right one.
Tuned
Joined: Jan 2021
Posts: 377
Likes: 81
HA, so, remove the 6 screws holding the cover plate on, so we can see the inside of the ECU. Also, is there a tag on the connector of the ECU, if yes, send a photo of that as well.
That glob of silicone on the #1 wire is a concern. That is the power that supplies voltage to the keep alive memory (used to help with fueling)
Anyway, open that puppy uppy.
That glob of silicone on the #1 wire is a concern. That is the power that supplies voltage to the keep alive memory (used to help with fueling)
Anyway, open that puppy uppy.
Thread Starter
|
Trailering
Joined: Aug 2025
Posts: 16
Likes: 2
HA, so, remove the 6 screws holding the cover plate on, so we can see the inside of the ECU. Also, is there a tag on the connector of the ECU, if yes, send a photo of that as well.
That glob of silicone on the #1 wire is a concern. That is the power that supplies voltage to the keep alive memory (used to help with fueling)
Anyway, open that puppy uppy.
That glob of silicone on the #1 wire is a concern. That is the power that supplies voltage to the keep alive memory (used to help with fueling)
Anyway, open that puppy uppy.
Here it is
Tuned
Joined: Jan 2021
Posts: 377
Likes: 81
Ok, so it does look like there is an issue with at least one of the capacitors. If you look closely at the little red capicator next to the orange blob, you will see what looks like corrosion. This almost certanly a part of your problems.
What you need to do is get another ECU with the F5TF-12a650-ALA and or DOE0
Now, there may be some that are really close to those that may work, but if you can find an exact match, that would be best. Another option is to send this one off and have it rebuilt.
Should not be that expensive.
Get this sorted, and then on to the next step.
What you need to do is get another ECU with the F5TF-12a650-ALA and or DOE0
Now, there may be some that are really close to those that may work, but if you can find an exact match, that would be best. Another option is to send this one off and have it rebuilt.
Should not be that expensive.
Get this sorted, and then on to the next step.
Logistics Pro
Joined: Aug 2014
Posts: 3,573
Likes: 855
Start looking for another SD-48E computer.
i just picked one up, remanufactured, caps replaced, but doesn’t get second gear in drive.
so, even if your caps are replaced, there could be other problems with the ecu.
i just picked one up, remanufactured, caps replaced, but doesn’t get second gear in drive.
so, even if your caps are replaced, there could be other problems with the ecu.