87 5.0 No Fire Problem... tried many different things but nothing
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Senior Member
Joined: Jul 2005
Posts: 1,463
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From: off the path in Louisiana
87 5.0 No Fire Problem... tried many different things but nothing
ok guys here's what i'm working on
87 Ford Bronco 5.0 xlt automatic transmission.
here's what i've replaced:
ignition switch
ignition coil
ignition cylinder
starter
starter solenoid
its cranking over fine but isn't getting any spark. i took my test light and at the harness (a 2 wire harness) that plugs into the ignition coil, i'm getting a strong 12v and on the other a weaker voltage (which from what i've read about the ignition coil is correct). i can unplug the distributor wire and get a VERY VERY weak light (almost too low to see) when i'm cranking it. i'm thinking it's GOT to be a ground problem but made sure no paint and it has good contact when i mounted it.
any ideas? yea this is f150, and i know all about fullsizebronco. yes, i've searched. i've been on this forum FOREVER
87 Ford Bronco 5.0 xlt automatic transmission.
here's what i've replaced:
ignition switch
ignition coil
ignition cylinder
starter
starter solenoid
its cranking over fine but isn't getting any spark. i took my test light and at the harness (a 2 wire harness) that plugs into the ignition coil, i'm getting a strong 12v and on the other a weaker voltage (which from what i've read about the ignition coil is correct). i can unplug the distributor wire and get a VERY VERY weak light (almost too low to see) when i'm cranking it. i'm thinking it's GOT to be a ground problem but made sure no paint and it has good contact when i mounted it.
any ideas? yea this is f150, and i know all about fullsizebronco. yes, i've searched. i've been on this forum FOREVER
Senior Member
Joined: Nov 2006
Posts: 5,495
Likes: 7
From: Memphis, TN 38135, USA, Earth
Why did you replace all that other stuff? If it was for this issue, then I hope you kept it all since it's probably still good.
Do you have a Haynes manual & a digital mutimeter? They're good investments, but read this caption first:
The ignition diagnostic procedure for your truck is in Ch.5, usually Sec.5 or 7, and if you follow what it says & jump to the correct step for your symptoms & results, it WILL pinpoint the fault. Known problems on that truck include the ICM, PIP, EEC, engine wiring connectors near the firewall, FP & EECPWR relays, & alternator.
Do you have a Haynes manual & a digital mutimeter? They're good investments, but read this caption first:
The ignition diagnostic procedure for your truck is in Ch.5, usually Sec.5 or 7, and if you follow what it says & jump to the correct step for your symptoms & results, it WILL pinpoint the fault. Known problems on that truck include the ICM, PIP, EEC, engine wiring connectors near the firewall, FP & EECPWR relays, & alternator.