Crank no start
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5th Wheeling
Joined: Mar 2024
Posts: 43
Likes: 1
Crank no start
I have a 93 ford f150 300 I.
Have put new tank and fuel pump in.
New plugs, wires, cap and rotor.
Redone injectors has them sent out.
It will run all day on either it has 58 lbs rail pressure aneven when cranking it holds it along with holding it after I let it sit.
I put a new ecm
in it this morning it fired right up ran for 10 seconds and when I tried to rev it a little it quit.
Please any help is appreciated.
Have put new tank and fuel pump in.
New plugs, wires, cap and rotor.
Redone injectors has them sent out.
It will run all day on either it has 58 lbs rail pressure aneven when cranking it holds it along with holding it after I let it sit.
I put a new ecm
in it this morning it fired right up ran for 10 seconds and when I tried to rev it a little it quit.
Please any help is appreciated.
Fleet Mechanic
Joined: Nov 2006
Posts: 1,664
Likes: 219
From: Northwest
Fuel reset button ?
https://www.ford-trucks.com/forums/9...150-302-a.html
Does rail pressure drop off as the engine is dying ?
https://www.ford-trucks.com/forums/9...150-302-a.html
Does rail pressure drop off as the engine is dying ?
Thread Starter
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5th Wheeling
Joined: Mar 2024
Posts: 43
Likes: 1
This is the 1st time it ran on it s own without either I never had pressure gauge hooked up.Button was not popped.I pulled iac valve off it looks clean not any crud in there a little oily wet is it suppose to be like that,it is probably the original one.
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5th Wheeling
Joined: Mar 2024
Posts: 43
Likes: 1
Codes 542 and 543 it was running he was driving it since new. His eyes went bad can’t drive anymore.He was starting it every week or so till it stopped running gas was bad along with fuel pumps trashed.I put the parts on it trying to get it running for my grandson,it really needed those parts.I checked the tps it checked out with ohm meter.any help would be appeciated.This is definitely been a tough nut to crack.I just went out and fired it up a few moments ago ran for 10 seconds or so as soon as I touch the fuel petal it quits.
FTE Legend
Joined: Nov 2015
Posts: 30,955
Likes: 4,127
From: Angier, NC
I dont have a book but what do the 2 codes show?
How old are the codes as I thought you had to be up to normal temp to run the test?
So it will run but only at idle?
How long will it run at idle if you dont touch the throttle?
Any movement of the throttle it stops running?
Will it restart and idle or not even try to restart?
If it dose not even try to restart what happens if you spray a little starting fluid will it do anything? (I see you said it will run all day long with spray).
I take it it has not run long enough to get to normal temp so it is running on closed loop.
Wonder what happens when it gets to normal temp will it do the same thing?
I know you checked the TPS ohm but is it set right on the throttle?
If it to be say 2 ohm at idle and 10 at WOT is this what you get or did I read your post wrong?
Also have you checked the timing? Dose it run different with the sprot jumper in or out?
I see you changed out the ECM (inside the cab?) what about the ICM in the dist.?
I have see this do some crazy shi* in posts.
Just trying to see what could be dont that makes a change as that may be a clue where to look deeper.
Dave ----
How old are the codes as I thought you had to be up to normal temp to run the test?
So it will run but only at idle?
How long will it run at idle if you dont touch the throttle?
Any movement of the throttle it stops running?
Will it restart and idle or not even try to restart?
If it dose not even try to restart what happens if you spray a little starting fluid will it do anything? (I see you said it will run all day long with spray).
I take it it has not run long enough to get to normal temp so it is running on closed loop.
Wonder what happens when it gets to normal temp will it do the same thing?
I know you checked the TPS ohm but is it set right on the throttle?
If it to be say 2 ohm at idle and 10 at WOT is this what you get or did I read your post wrong?
Also have you checked the timing? Dose it run different with the sprot jumper in or out?
I see you changed out the ECM (inside the cab?) what about the ICM in the dist.?
I have see this do some crazy shi* in posts.
Just trying to see what could be dont that makes a change as that may be a clue where to look deeper.
Dave ----
Thread Starter
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5th Wheeling
Joined: Mar 2024
Posts: 43
Likes: 1
The 2 codes are fuel pump secondary circuit fault these are probably from both fuel pumps were bad.
It runs for 10 seconds or so then just cranks trying to fire ,if I let it rest for hour or so it does the same will fire up and run for 10 seconds.
if I remember right it was.50 at idle and 4:50 at wot.
with spout in or out no difference.
The first time when it fired up I was a happy camper when I applied throttle to rev a bit it immediately quit.
It runs for 10 seconds or so then just cranks trying to fire ,if I let it rest for hour or so it does the same will fire up and run for 10 seconds.
if I remember right it was.50 at idle and 4:50 at wot.
with spout in or out no difference.
The first time when it fired up I was a happy camper when I applied throttle to rev a bit it immediately quit.
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5th Wheeling
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FTE Legend
Joined: Nov 2015
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From: Angier, NC
The 2 codes are fuel pump secondary circuit fault these are probably from both fuel pumps were bad.
It runs for 10 seconds or so then just cranks trying to fire ,if I let it rest for hour or so it does the same will fire up and run for 10 seconds.
if I remember right it was.50 at idle and 4:50 at wot.
with spout in or out no difference.
The first time when it fired up I was a happy camper when I applied throttle to rev a bit it immediately quit.
It runs for 10 seconds or so then just cranks trying to fire ,if I let it rest for hour or so it does the same will fire up and run for 10 seconds.
if I remember right it was.50 at idle and 4:50 at wot.
with spout in or out no difference.
The first time when it fired up I was a happy camper when I applied throttle to rev a bit it immediately quit.
I would clear the codes.
Hook up a fuel psi gauge and see what the gauge reads when you first turn the key on but dont try and start it.
It should read psi as the computer should start the fuel pump to prime the fuel system.
Turn the key on and off 3 or 4 times and see if the PSI goes up more.
Watching the fuel psi gauge start it and let it idle as long as it will, what happen to the fuel psi?
I am trying to rule out it is a fuel issue.
So you replaced the ECM (computer inside the cab) and the ICM (dist.) with no change?
Dave ----
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5th Wheeling
Joined: Mar 2024
Posts: 43
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Dave The .50 and 4.50. Is what it’s suppose to be.
I will clear codes and check rail on weekend Thks for your help.
yes I changed the icm then ecm on the weekend.
when I changed the ecm I started up and ran smooth for about 10 seconds as soon as I was going to give it throttle it quit.
I will clear codes and check rail on weekend Thks for your help.
yes I changed the icm then ecm on the weekend.
when I changed the ecm I started up and ran smooth for about 10 seconds as soon as I was going to give it throttle it quit.
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5th Wheeling
Joined: Mar 2024
Posts: 43
Likes: 1
Dave sorry for delay been under the weather
Put on pressure gauge 40 with key on then off and on then went up to 50 lbs
Tried to start fired up for about 5 seconds then quit fuel pressure stayed up tried to restart just cranks fuel pressure stays about 50 when crankin.
I checked for codes there are none.
unplugged tps no difference.
Put on pressure gauge 40 with key on then off and on then went up to 50 lbs
Tried to start fired up for about 5 seconds then quit fuel pressure stayed up tried to restart just cranks fuel pressure stays about 50 when crankin.
I checked for codes there are none.
unplugged tps no difference.
FTE Legend
Joined: Nov 2015
Posts: 30,955
Likes: 4,127
From: Angier, NC
it has to be either fuel or spark?I wonder if you "hot wire" the coil if it will stay running?
Then again you say it will run all day long if you spray starting fluid so it is getting spark if that is right, so that to me is pointing to a fuel issue.
You are showing fuel PSI but are the injectors getting a signal to open is the question now?
I would make sure it will run on spray again and if it still runs I would look into if the injectors are getting a signal.
Is there a single ground wire for the injectors that may not be hooked up?
I want to say I seen posted a ground for the computer (ECM) maybe out by the battery that fails with the acid but could be wrong too?
Yep power to the injectors is next
Dave ----
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5th Wheeling
Joined: Mar 2024
Posts: 43
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Hi Dave been so hot lately.Every day I come home I key over 3 times it fires right up and runs for 4 or 5 seconds and quits.
if I let it sit for hour or so it does the same thing.
good pressure it does not drop off when it quits
relay is good.
Good juice to injectors.
if I let it sit for hour or so it does the same thing.
good pressure it does not drop off when it quits
relay is good.
Good juice to injectors.
FTE Legend
Joined: Nov 2015
Posts: 30,955
Likes: 4,127
From: Angier, NC
I am at a loss 
Will run all day long on spray points to a fuel issue to me but.
Will hold fuel PSI even when it stalls and will not restart till it sits a few hours.
This I want to say could be spark after the above fuel PSI but it runs on spray so ????
I want to say something is telling the injectors to stop spraying and why the motor stalls and still has fuel PSI.
Is there any way to put test light(s) on the injectors to see if they are getting power and then stop getting power when it stalls?
Dave ----
Will run all day long on spray points to a fuel issue to me but.
Will hold fuel PSI even when it stalls and will not restart till it sits a few hours.
This I want to say could be spark after the above fuel PSI but it runs on spray so ????
I want to say something is telling the injectors to stop spraying and why the motor stalls and still has fuel PSI.
Is there any way to put test light(s) on the injectors to see if they are getting power and then stop getting power when it stalls?
Dave ----