no spark... anywhere
Thread Starter
|
New User
Joined: Dec 2011
Posts: 5
Likes: 0
no spark... anywhere
I'm hoping someone can help me. I have a 77 ford f-250 with the 400 in it. I have replaced the solenoid, coil, ignition control module, plugs, wires, cap, rotor, and distributor. I still have no spark, the ignition switch is new and installed correctly. I have spent the last few hours chasing wires and they all go where they should with no shorts or loose connections. If anyone has any ideas as to what to check next i would be very appreciative.
Junior User
Joined: Nov 2011
Posts: 87
Likes: 0
red wire on the duraspark box should have 12v key on. white is 12v when cranking. look at the connectors. i had a bad one on my 01 mustang dura spark box and it pissed in my pepsi for a couple hours, looked fine but i had zero fire till i built a new harness from the dizzy to the box and junked the early 80 wiring.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Two questions:
(1) How are you checking for spark?
(2) If you crank the engine over with the distributor cap removed, does the rotor actually turn?
Also:
That's hilarious, gonna have to rememeber that one
(1) How are you checking for spark?
(2) If you crank the engine over with the distributor cap removed, does the rotor actually turn?
Also:
That's hilarious, gonna have to rememeber that one
Trending Topics
Thread Starter
|
New User
Joined: Dec 2011
Posts: 5
Likes: 0
im checing spark by pullin the coil wire off the distributer and inserting a screw driver and cranking the motor. And yes the rotor is moving. I have power to the coil but nothing coming out. the coil is brand new but i was wondering if i should go have it tested cause that seems to be where my power is getting interupted.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Elder User
Joined: Dec 2010
Posts: 600
Likes: 1
From: New Carlisle, Ohio
There is a ground wire at the back. It hooks from the firewall to the intake manifold. Unbolt it from the mainfold and rub sandpaper over the end of the wire and the manifold. See if that fixes your problem.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Next test: keep the coil connected, and connect a test light from the negative (TACH TEST) terminal of the coil to clean, unpainted metal on the engine (ground). Crank the engine over with the key, and the light should BLINK. Report your results.
Thread Starter
|
New User
Joined: Dec 2011
Posts: 5
Likes: 0
I hooked my test light to the negative coil lead and grounded it on the block. While cranking the test light just stays on it doesn't flash does this mean i am getting no signal from the distributor?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
That's one possible explanation. If the light stays ON and does not BLINK, then the ignition module is not switching the coil. Possible explanations:
1) Faulty ignition module
2) No power to ignition module
3) Pickup inside distributor not sending trigger signal to module
4) Wiring bad in between.
1) Faulty ignition module
2) No power to ignition module
3) Pickup inside distributor not sending trigger signal to module
4) Wiring bad in between.
Thread
Thread Starter
Forum
Replies
Last Post
Manchester79
1973 - 1979 F-100 & Larger F-Series Trucks
8
Jan 10, 2013 08:54 AM
TheBlueMule
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
11
Dec 8, 2008 09:55 AM
keld
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
15
Dec 5, 2004 10:27 PM
