MY TRUCK TRIES TO START ITSELF!

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NickC-WithTheXLT
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MY TRUCK TRIES TO START ITSELF!

Post #1 by NickC-WithTheXLT » Mon Aug 15, 2016 7:29 pm

This is absolutely insane. I have a 1988 f150 4.9 EFI. When I went to start it, it acted like there wasn't even a battery. Didn't even try to start. The battery tested 17 volts. I saw that there was a wire that would spark when I tapped it, connected to the negative part of the battery. Took it off to discover the wires were fried. I cut it back, stripped the wires fresh, and reconnected everything. Put on the negative....fine...as soon as I touched the positive to the battery it sparked and the engine tried to start itself. The key wasn't even in the ignition whatsoever. Put the key in, wiggled the ignition around, and tried to touch the terminal to the battery again. Truck tried to start itself. What. Do. I. Do. Please help...
:beer:

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MechRick
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Location: Las Vegas, NV

Re: MY TRUCK TRIES TO START ITSELF!

Post #2 by MechRick » Mon Aug 15, 2016 11:27 pm

Sounds like the fender mounted solenoid stuck on you.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam installed straight up (aluminum cam gear)
Hedman header, full mandrel bent duals, crossover, super turbos
viewtopic.php?f=2&t=73244
Bronco II with a 2.3L swap viewtopic.php?f=13&t=72863

username
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Re: MY TRUCK TRIES TO START ITSELF!

Post #3 by username » Tue Aug 16, 2016 11:34 am

MechRick wrote:Sounds like the fender mounted solenoid stuck on you.


:nod: https://www.youtube.com/watch?v=G9M6YTTX2Gk

sdiesel
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Location: NW Oregon,Buxton currently

Re: MY TRUCK TRIES TO START ITSELF!

Post #4 by sdiesel » Tue Aug 16, 2016 11:45 pm

the ford pickup has a reputation as being gung-ho for the job, but this is ridiculous!!!
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

sdiesel
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Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: MY TRUCK TRIES TO START ITSELF!

Post #5 by sdiesel » Tue Aug 16, 2016 11:51 pm

did i read somewhere there is a swap out for the fender relay?
some kind of work around
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

arse_sidewards
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Re: MY TRUCK TRIES TO START ITSELF!

Post #6 by arse_sidewards » Sat Aug 20, 2016 9:28 pm

sdiesel wrote:did i read somewhere there is a swap out for the fender relay?
some kind of work around


They changed solenoids sometime in the 80s IIRC which supposedly reduced the number of problems like yours by a lot. Tell the guy at the counter you want a solenoid for a 96.
1994 F150 4x4 8ft EEC-IV
-460 rocker arm Guinea Pig: 3rd world quality "file to fit" machining

-exhaust leak that sounds like a bucket of playing cards being fed into the radiator fan
-66" leafs ('11 Superduty), extended radius arms.

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