HELP..No Spark......Problem Solved!!!!
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Joined: Oct 2010
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HELP..No Spark......Problem Solved!!!!
Hi guys, new to this forum..Hello everyone..
I have a 1984 F150, 4.9 straight 6, 4 spd
Suddenly quit during heavy rain in my driveway.
Tried starting fluid into carb to determine if fuel or spark problem..
Replaced:
Pickup Coil...twice brand new
Ignition Control Module...distributor mounted...twice brand new
Primary Coil
Cap, Rotor, Wires, Plugs
.....
I have 12V at Primary Coil
Checked " spout " signal between Ignition Control Module and Powertrain Control Module..3.6Vac
Motor cranks strong...Just NO spark...
I do not know what to do next...
ANY suggestions????
Thanks...Tom
I have a 1984 F150, 4.9 straight 6, 4 spd
Suddenly quit during heavy rain in my driveway.
Tried starting fluid into carb to determine if fuel or spark problem..
Replaced:
Pickup Coil...twice brand new
Ignition Control Module...distributor mounted...twice brand new
Primary Coil
Cap, Rotor, Wires, Plugs
.....
I have 12V at Primary Coil
Checked " spout " signal between Ignition Control Module and Powertrain Control Module..3.6Vac
Motor cranks strong...Just NO spark...
I do not know what to do next...
ANY suggestions????
Thanks...Tom
Thread Starter
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New User
Joined: Oct 2010
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Also hooked up known good timing light to #1 plug (re-installed) while cranking..light never comes on...never picking up spark through magnetic pickup...
Post Fiend
Joined: Nov 2005
Posts: 7,437
Likes: 4
From: Charles Town, W bygod Va
It could be a bad ecm, I was just looking at the wiring diagram at Autozone.com (all you have to do is register for free to get them) other than a bad connection somewhere thats all that's left.
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I do not see "ECM"
It's got to be the onboard computer..
..EEC-IV Module, or connection somewhere I have missed..Keep you informed on progress....Tom
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For those interested, Started checking grounds under the hood, moving inspecting wiring harness..very old and fragile, some wires with insulation breaking apart..went to the EEC-IV computer module under the dash, found only partial power to the 60 pin connector. Missing 12V on pins 37, 57. This comes from the EEC Power Relay. Pulled what I think is the EEC Power Relay, made a jumper to short, simulate contacts closed..Hit the key..Started Immediately!!!!!!!Whooo HOOO. Now the weird part...pulled the jumper off, Truck continued to run..maybe a little less RPM..Re-started the truck with Relay OUT??? Put Relay back in...ALL OK...Anyway Truck is now running and I believe I have isolated the problem to the EEC Power Relay or associated connector, wires..
Thanks to all who tried to Help me...Tom..
Thanks to all who tried to Help me...Tom..
