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  #1  
Old 12-06-2018, 10:05 AM
lilmrford lilmrford is offline
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Default 2004 ranger 4.0 sohc. cranks/ no start

As the title implies. Wife drove it home from work, no issues. Went to run an errand about an hour or so later, it started and briefly ran (rough), then died and wouldn't restart. Would like to do electrical checks first. Searched but couldn't find a schematic for powertrain
control for an '04. Anyone know where I might find one? The fuel pump was changed a year or two ago, can't remember, but that doesn't mean
it's ok necessarily. I am getting constant power thru fuse #23 in the underhood power distribution box, key turned ON or Off, makes no difference, 23 is always lit. This seems wrong to me, but I am totally open to any ideas or corrections you guys might have pertinate to what
I have tried so far. Thanks in advance....jim
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Old 12-06-2018, 12:31 PM
TxGasRacer TxGasRacer is online now
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

http://visualbits.net/Car%20Stuff/Fo...r%202001-2008/
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Old 12-06-2018, 08:08 PM
Bird76Mojo Bird76Mojo is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

Turn the key forward and check the schrader valve on the fuel rail to see if it has fuel pressure. If not, then check the fuel pump inertia switch in the cab under the dash. See if it got tripped somehow.. It does happen..

If all of the fuel system checks out, then check for spark at one of your spark plug wires.



GB
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Old 12-07-2018, 01:49 PM
lilmrford lilmrford is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

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Originally Posted by TxGasRacer View Post
thanks tgr.
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Old 12-08-2018, 05:09 PM
lilmrford lilmrford is offline
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Talking Re: 2004 ranger 4.0 sohc. cranks/ no start

Quote:
Originally Posted by Bird76Mojo View Post
Turn the key forward and check the schrader valve on the fuel rail to see if it has fuel pressure. If not, then check the fuel pump inertia switch in the cab under the dash. See if it got tripped somehow.. It does happen..

If all of the fuel system checks out, then check for spark at one of your spark plug wires.



GB
it turned out to be the inertia switch was tripped. It did it again later today and the same symptoms. reset switch and all is well. Must be time for a new switch. Thanks everybody
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Old 12-08-2018, 06:27 PM
Dirtman Dirtman is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

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Originally Posted by lilmrford View Post
it turned out to be the inertia switch was tripped. It did it again later today and the same symptoms. reset switch and all is well. Must be time for a new switch. Thanks everybody
Once tripped those switches are junk.... A mild fart will trip them once used.
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Old 12-09-2018, 11:49 AM
Bird76Mojo Bird76Mojo is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

Good deal! Glad to have confirmation that my suggestion ended up being the problem for once. We don't often hear back from the original poster on these threads..

Luckily the switches are an easy find/fix and easy to swap out as well.

Now, tell the wife to slow down and stop ram-jamming over those potholes so fast! lol j/k



GB
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1987 standard cab w/92 5.0/T5Z 31 spline 8.8 w/Torsen

1989 Regular cab longbed, manual 2.9 4x4 - Parts BroncoII's x 3
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Old 12-17-2018, 06:39 PM
lilmrford lilmrford is offline
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Talking Re: 2004 ranger 4.0 sohc. cranks/ no start

Quote:
Originally Posted by Bird76Mojo View Post
Good deal! Glad to have confirmation that my suggestion ended up being the problem for once. We don't often hear back from the original poster on these threads..

Luckily the switches are an easy find/fix and easy to swap out as well.

Now, tell the wife to slow down and stop ram-jamming over those potholes so fast! lol j/k



GB




Actually, in this case, I think it's from the door getting slammed every
time she gets in. WHAM!!!
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Old 12-18-2018, 02:51 AM
Bob C. of Indiana Bob C. of Indiana is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

Can a inertia switch sometimes work and sometimes not? My truck wouldn't start, had it towed to my favorite mechanic shop, they claimed the inertia switch was at fault. Ran great for a couple of weeks now returning back to a hard starting problem again. I bought a new crank sensor if it fails again and then will investigate the fuel pump, if that don't fix it. Didn't mean to hijack the thread, but I posted and didn't get a differentiate response.Thanks
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Old 12-18-2018, 05:22 PM
Bird76Mojo Bird76Mojo is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

Quote:
Originally Posted by Bob C. of Indiana View Post
Can a inertia switch sometimes work and sometimes not? My truck wouldn't start, had it towed to my favorite mechanic shop, they claimed the inertia switch was at fault. Ran great for a couple of weeks now returning back to a hard starting problem again. I bought a new crank sensor if it fails again and then will investigate the fuel pump, if that don't fix it. Didn't mean to hijack the thread, but I posted and didn't get a differentiate response.Thanks

Any switch of any kind can work intermittently whenever it decides it's had enough. It would be a cheap part to replace just to eliminate that as a possibility. In your case it could be the inertia switch, a bad ground, or a wire that has some corrosion inside of it, a pinched or almost broken wire, etc..

If it were me, when the truck was refusing to start, I'd listen for the fuel pump kicking on first. Then go from there.



GB
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2001 Edge Regular cab, auto 4.0L 4x4 4.10LS 8.8

1987 standard cab w/92 5.0/T5Z 31 spline 8.8 w/Torsen

1989 Regular cab longbed, manual 2.9 4x4 - Parts BroncoII's x 3
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Old 12-18-2018, 05:43 PM
Bob C. of Indiana Bob C. of Indiana is offline
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Default Re: 2004 ranger 4.0 sohc. cranks/ no start

Quote:
Originally Posted by Bird76Mojo View Post
Any switch of any kind can work intermittently whenever it decides it's had enough. It would be a cheap part to replace just to eliminate that as a possibility. In your case it could be the inertia switch, a bad ground, or a wire that has some corrosion inside of it, a pinched or almost broken wire, etc..

If it were me, when the truck was refusing to start, I'd listen for the fuel pump kicking on first. Then go from there.



GB
Thanks for your help!
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