No start condition
Thread Starter
|
Mountain Pass
Joined: Jan 2004
Posts: 112
Likes: 0
From: niantic, ct.
No start condition
here's the story, i have a 95 ford 250 scab 4x4 7.5 that i bought used about a year ago. I believe it was a theft recoveryor a repo, anyway the ignition switch on the column is very loose and i dont have the normal ford key(the black plastic one). (this could be part of my probelm).
The truck has been fine until this last week when the rear brake line popped which dumped fluid from one end to the other. once that was repaired things were good unitl yesterday, stopped for gas and when i restarted it run for only a few seconds and shut off. then it would crank over. I put a scan tool one it and it said system ok, no spark though and the fuel pumps are running up to pressure. I installed a new cap, rotor, coil pack, ignition module and still nothing. I shook a few connectors here and there and the truck started. once i had it home, i changed the power distribution solenoid by the battery and the truck failed again. no power to the coil. with the key on after many retries to start i unplugged the fuel pumps and plugged them back in and the truck started and has been running since. Do the fuel pumps have something to do with power the coil? I need the truck but can not depend on it at the moment. thanks for any input
The truck has been fine until this last week when the rear brake line popped which dumped fluid from one end to the other. once that was repaired things were good unitl yesterday, stopped for gas and when i restarted it run for only a few seconds and shut off. then it would crank over. I put a scan tool one it and it said system ok, no spark though and the fuel pumps are running up to pressure. I installed a new cap, rotor, coil pack, ignition module and still nothing. I shook a few connectors here and there and the truck started. once i had it home, i changed the power distribution solenoid by the battery and the truck failed again. no power to the coil. with the key on after many retries to start i unplugged the fuel pumps and plugged them back in and the truck started and has been running since. Do the fuel pumps have something to do with power the coil? I need the truck but can not depend on it at the moment. thanks for any input
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
NO, the FUEL PUMPS have nothing to do with the power to the coil and the COMPUTER (PCM) has nothing to do with the power either.
The path for the power to the coil is:
Batt+ post to Starter Relay on finder.
Relay Terminal to FUSE Link A & B.
From A & B over 37 Yellow wire to Engine Compartment Fuse Box, FUSE P 50AMP
From Fuse P over 37 Yellow wire through connector C202 & Splice S234 to Ignition Switch C269 & B5.
From B5 out I1 through C269 over a Red/Light Green (16) wire through S206 & C202 to Engine Compartment Fuse Box Fuse U 20 Amp.
From Fuse U over R/LG (16) through S148, C101, S199 and C1008 at Ignition Coil.
COMPUTER (PCM) are either good or bad, they are never in the mode of going bad. They are made up of solid state components with a life expectancy of about one million years. They fail in a instance when they let the smoke out.
The path for the power to the coil is:
Batt+ post to Starter Relay on finder.
Relay Terminal to FUSE Link A & B.
From A & B over 37 Yellow wire to Engine Compartment Fuse Box, FUSE P 50AMP
From Fuse P over 37 Yellow wire through connector C202 & Splice S234 to Ignition Switch C269 & B5.
From B5 out I1 through C269 over a Red/Light Green (16) wire through S206 & C202 to Engine Compartment Fuse Box Fuse U 20 Amp.
From Fuse U over R/LG (16) through S148, C101, S199 and C1008 at Ignition Coil.
COMPUTER (PCM) are either good or bad, they are never in the mode of going bad. They are made up of solid state components with a life expectancy of about one million years. They fail in a instance when they let the smoke out.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Originally Posted by subford
COMPUTER (PCM) are either good or bad, they are never in the mode of going bad.
Given the original poster's description, I would start looking for bad grounds first. Bad grounds can lead to all sorts of electrical problems, some of which you wouldn't ever guess.
Thread Starter
|
Mountain Pass
Joined: Jan 2004
Posts: 112
Likes: 0
From: niantic, ct.
Then the possible source could be a bad ground or maybe the Ignition switch assembly on the column?
the biggest reason for my concern is safety, I would not want to be on the highway when it cuts out.
the biggest reason for my concern is safety, I would not want to be on the highway when it cuts out.
Last edited by kenjan61; Sep 26, 2005 at 12:32 PM.
Trending Topics
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by kenjan61
Then the possible source could be a bad ground or maybe the Ignition switch assembly on the column?
the biggest reason for my concern is safety, I would not want to be on the highway when it cuts out.
the biggest reason for my concern is safety, I would not want to be on the highway when it cuts out.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
Thread Starter
|
Mountain Pass
Joined: Jan 2004
Posts: 112
Likes: 0
From: niantic, ct.
well so far it is still running, not sure what change to keep it going. I installed a new ignition switch last night just so i could rule that out as a possiblity if it happens again. I think the only thing left would be the grounds. Does anyone have the diagram that tells you where they all are?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by kenjan61
well so far it is still running, not sure what change to keep it going. I installed a new ignition switch last night just so i could rule that out as a possiblity if it happens again. I think the only thing left would be the grounds. Does anyone have the diagram that tells you where they all are?
However make sure that the two grounds coming from the NEG side of BATT are good G103 (ENGINE) and G101 (BODY) as if you lose the ground going to the PCM the engine will quit.
Also make sure both BATT Terminals are clean.
Thread Starter
|
Mountain Pass
Joined: Jan 2004
Posts: 112
Likes: 0
From: niantic, ct.
well it is down again, my daughter broke down in the middle lane of the highway. it just shut off. we had it towed home. same problem. new solenoid at the fender same, no power to the coil or at the solenoid.(old and new). turns over with no problem until the battery is dead.
Thread Starter
|
Mountain Pass
Joined: Jan 2004
Posts: 112
Likes: 0
From: niantic, ct.
any input on the obd1 scan tool, I have check the truck using the tool and it says the system is ok. would such a tool check fuel pumps, fuel regulator, and ingintion stuff?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Originally Posted by kenjan61
well it is down again, my daughter broke down in the middle lane of the highway. it just shut off. we had it towed home. same problem. new solenoid at the fender same, no power to the coil or at the solenoid.(old and new). turns over with no problem until the battery is dead.
How are you checking for power, test light, meter?
Check to see if you have power at Fuse "U" with the key on. It is in the Engine Compartment Fuse Box, the fuse is in a square box under the hood on drivers side. Check both sides of the fuse.
If nothing there check fuse "P" in the same box.
