87 won't start
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Senior User
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87 won't start
my 87 F-150 I-6 4 SPD granny 4X4 won't start.it will turn over but not start.i don't hear the fuel pumps energize or even hear the relays energize.do relays go bad and how do i check them?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
First check the small black wire with a green stripe leaving the NEG (-) post of the battery and make sure it has a good ground. Also check the wire going to the Body (not frame) ground.
If they are OK then put you hands on the EEC Power relay and the fuel pump relay and have someone turn the key just to on.
Did both relays click when the key was turned on?
If not check the wiring under the relay sockets.
If OK check out the Ignition switch.
If not replace the relays and sockets.
If the relays did click did the fuel pump relay (the green socket one) click again one second later when it dropped back out?
If it did try pushing down on the reset button on top of the Inertia fuel shut off switch.
If the Inertia fuel shut off switch was OK check for power for one second at the Inertia fuel shut off switch wires (in & out) when the key is just turned to on with a test light.
Let us know what you find at this point.
The diagram below shows both the factory relays and the replacement relay wiring if you need to replace them. The numbers in the relays in the wiring are for the replacement newer stile relays.
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If they are OK then put you hands on the EEC Power relay and the fuel pump relay and have someone turn the key just to on.
Did both relays click when the key was turned on?
If not check the wiring under the relay sockets.
If OK check out the Ignition switch.
If not replace the relays and sockets.
If the relays did click did the fuel pump relay (the green socket one) click again one second later when it dropped back out?
If it did try pushing down on the reset button on top of the Inertia fuel shut off switch.
If the Inertia fuel shut off switch was OK check for power for one second at the Inertia fuel shut off switch wires (in & out) when the key is just turned to on with a test light.
Let us know what you find at this point.
The diagram below shows both the factory relays and the replacement relay wiring if you need to replace them. The numbers in the relays in the wiring are for the replacement newer stile relays.
/
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
fusible link "M"???
The yellow wire in the above schematic provides power -through- the relay but does not provide the pull down current.
It would click, but do nothing if the link was burnt coming from the starter solenoid.
The yellow wire in the above schematic provides power -through- the relay but does not provide the pull down current.
It would click, but do nothing if the link was burnt coming from the starter solenoid.
Thread Starter
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Senior User
Joined: Sep 2009
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the truck turns over,but doesn't start.i'm getting spark but no start.it leaves the fuel system.i'm not a mech. but like to tinker alittle.the truck is not my daily driver,but like to drive it a few times a month.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
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pedant
Joined: Jan 2008
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From: EXTREME southwest CT
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pedant
Joined: Jan 2008
Posts: 23,576
Likes: 40
From: EXTREME southwest CT
I'm not the expert here but it looks like there are two connectors in the brown wire from the fuel relay to the inertia switch.
If you have one second of power at pin 87 (coming out of the relay) then I would suggest you trace this wire and check for loose or corroded connections.
If you have one second of power at pin 87 (coming out of the relay) then I would suggest you trace this wire and check for loose or corroded connections.