truck died...help!!!
Fleet Mechanic
Joined: Sep 2003
Posts: 1,716
Likes: 15
On my Ford trucks, the inertia switch is just to the right of the front passenger's feet, behind the plastic side panel. Has a little cutout or space to reach a finger in to press the reset switch on the top of it.
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Junior User
Joined: Aug 2007
Posts: 70
Likes: 0
From: owensboro,KY
just for troubleshooting purposes I ran a hot wire to the pump side of the inertia switch, and the pumps ran. So I tried to start the truck.....but it never even hit, just kept rolling over. I sprayed starting fluid in it and it started but died as soon as the ether was gone. I let the pumps run for a second before trying to start it. Could all the fuel have drained back while it was sitting causing it to take longer to prime?
Posting Guru
Joined: Mar 2005
Posts: 2,068
Likes: 0
From: western montana
pump in the tank...i don't buy an ignition problem yet. I'd check flow...just cause you think the pumps are running doesn't mean your getting fuel.
Why would it run on starting fluid??? The high pressure pump or low pressure could cause it...I had both go out in my 89 years ago with a similar issue each time. Clogged filter or line?
I'd do everything to make sure the fuel system was ok before buying into ignition problems though who knows.
Why would it run on starting fluid??? The high pressure pump or low pressure could cause it...I had both go out in my 89 years ago with a similar issue each time. Clogged filter or line?
I'd do everything to make sure the fuel system was ok before buying into ignition problems though who knows.
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Junior User
Joined: Aug 2007
Posts: 70
Likes: 0
From: owensboro,KY
alright thanks guys, I probably wont be working on it for a couple of days biz it is outside under a foot of snow. and I snagged my grandfathers '93 bronco with sssboggers, which should get me through for now.
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Junior User
Joined: Aug 2007
Posts: 70
Likes: 0
From: owensboro,KY
alright I got a chance to go out and screw with it. I changed the fuel filter and wired the pumps up checked to make sure there was adequate fuel psi at the rail, then tried to start it. And still nothing. If you spray ether in it it starts fine. But not with gas, I dont know if the computer is just fried and is not telling the pumps to run or the injectors to pulse, but it is for some reason telling the ignition system to work. Anybody ever heard of a computer halfway crapping out?
Posting Guru
Joined: Apr 2005
Posts: 2,018
Likes: 0
From: Longview, TX
I don't know is yours is like my 94. Open the electrical box under the hood, drivers side. There are a row of circuit breakers on the right. the first two have identical part numbers, one to ignition, one to fuel. Swap them and see if your pumps run normally.
Tuned
Joined: Sep 2005
Posts: 250
Likes: 11
After initial cranking the ignition system runs separately from the computer on a SD setup. The only time the computer controls the ignition is at initial crank. It delays the spark to get a bit of oil pressure in the engine and then it releases the ignition to work separately. So the computer is not required for spark form what I understand. The computer controls injector pulse time to lean out and richen the mixture. It's probably a computer. go to FordFuelInjection.com and read the theory on the SD system. It is very interesting and I think would be helpful to diagnose your problem.
Tuned
Joined: Sep 2005
Posts: 250
Likes: 11
Ford fuel injection theory
Here is the link that explains all the stages the computer goes through.
Here is the link that explains all the stages the computer goes through.