Not getting any fire
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Not getting any fire
hey yall i got a 1986 F150 5.0 efi 4x4 and it burnt up a solenoid and i replaced it and it started right up i also bought a new fuel relay for it and dropped the tank to wire it back up because i had wired it straight to the battery and now it wont start turns over fine but its not starting its not getting any fire in the motor to pick up the gas does anyone have any ideas my buddys dad came over and he checkd all the fuses and ignition switch and all that and they all have power but there is no fire picking up the gas
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From: Suffolk, VA USA
Chris, welcome to the club. I'm not saying this to be an @ss, but if you could put your post into sentences it would be very helpful to us trying to decipher things.
If I'm understanding you correctly, you aren't getting power to the fuel pumps. First, you have at least two pumps on your truck, a high pressure pump along the driver's side frame rail, and a low pressure pump in the tank(s). You also have an inertia switch that shuts off power to the fuel pumps in case of an accident. The inertia switch is located under your dash on the firewall on the passenger side just to the right of the heater duct. You should check for power at all of these places.
If I'm understanding you correctly, you aren't getting power to the fuel pumps. First, you have at least two pumps on your truck, a high pressure pump along the driver's side frame rail, and a low pressure pump in the tank(s). You also have an inertia switch that shuts off power to the fuel pumps in case of an accident. The inertia switch is located under your dash on the firewall on the passenger side just to the right of the heater duct. You should check for power at all of these places.
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ok let me try to explain this better first off i lost power to both pumps so i straight wired both pumps to my battery and i ran just fine. then i bought the fuel pump relay because that's what i thought wasn't working. so after installing the relay i dropped the tank to wire the fuel pump back up and after i wired it back up and before i strapped the tank back up i tried starting it and it cranks over but it wont start it wont even hesitate to start. so then i had my buddy's dad came over with a test light and he check my ignition switch and my fuel pressure and they we all fine but when we took off the spark plug and its not firing. usually i can spray gas into the motor and it fires right up but not now i don't know what is going on now.
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From: Dallas, GA
to get spark, you need power to both the ignition module and coil...as well as your distributor needs to be working correctly to signal the module it is time to fire the coil.
Both the module and coil gets power from different power sources in "start" and "run". You will need to check for power at these point to see where the issue is.
If you're getting power to the module and coil, then it could be an issue with the distributor or coil itself.
Both the module and coil gets power from different power sources in "start" and "run". You will need to check for power at these point to see where the issue is.
If you're getting power to the module and coil, then it could be an issue with the distributor or coil itself.
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From: Denver Metro Area, CO
An interesting situation here, something I just learned about in my own 1986 computer-controlled DD...
The fuel pump won't get power - won't even run the 1-2 seconds by just turning the key on - if the ignition module isn't hooked up and/or working properly.
This is by design, it purposely acts this way (according to my Haynes/Chilton manual for the DD).
What Bill says is also true - the inertia switch, check that, too. I've triggered mine just by pounding on the car with a hammer.
1986 EFI, I'm going to guess th TFI ignition, time for some diagnostic work.
Here is some stuff that might help:
Ford Ranger/Bronco II TFI Ignition Diagnostics
The fuel pump won't get power - won't even run the 1-2 seconds by just turning the key on - if the ignition module isn't hooked up and/or working properly.
This is by design, it purposely acts this way (according to my Haynes/Chilton manual for the DD).
What Bill says is also true - the inertia switch, check that, too. I've triggered mine just by pounding on the car with a hammer.
1986 EFI, I'm going to guess th TFI ignition, time for some diagnostic work.
Here is some stuff that might help:
Ford Ranger/Bronco II TFI Ignition Diagnostics
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From: Dallas, GA
excellent point. Not real familiar with the earlier computers but will the give a code for an electrical problem like this? Certainly worth trying.
How do you like that EcoBoost?
Posting Guru
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From: Suffolk, VA USA
There's not the library of info that you can get from an OBD II system. But it'll give you some basic ignition related codes like SPOUT circuit, fuel pump circuit, and can tell if there's a general ECM failure.
The EcoBoost is everything its supposed to be. Good fuel mileage, and incredible power across an almost flat torque curve. It just shoots right up and gives max power over a huge rpm range. Couldn't be happier with it.
The EcoBoost is everything its supposed to be. Good fuel mileage, and incredible power across an almost flat torque curve. It just shoots right up and gives max power over a huge rpm range. Couldn't be happier with it.
Posting Guru
Joined: Jan 2012
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From: Dallas, GA
There's not the library of info that you can get from an OBD II system. But it'll give you some basic ignition related codes like SPOUT circuit, fuel pump circuit, and can tell if there's a general ECM failure.
The EcoBoost is everything its supposed to be. Good fuel mileage, and incredible power across an almost flat torque curve. It just shoots right up and gives max power over a huge rpm range. Couldn't be happier with it.
The EcoBoost is everything its supposed to be. Good fuel mileage, and incredible power across an almost flat torque curve. It just shoots right up and gives max power over a huge rpm range. Couldn't be happier with it.
Have a co-worker with the EcoBoost, he loves it as well.
Posting Guru
Joined: Jun 2002
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From: Suffolk, VA USA
Sorry...didn't mean to leave you with the impression these were OBDII. They aren't. They're OBD I. I was just saying you can't get the same level of info that an OBDII setup will give you.
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