No Spark...
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Junior User
Joined: Jun 2014
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From: Ohio
No Spark...
Last week I was driving down the expressway in the fast lane, of course, when my truck hit a bump and shutoff. After I got it pulled over and looked under the hood I found that the negative battery cable had come loose from the terminal connector. I reinstalled but unfortunately I could not get it restarted and had to call for a tow.
I finally got a chance to check a couple thing yesterday and after little checking and I can hear the fuel pumps cycle when the ignition is turned on. After a little more checking I found I had no spark. When I bought it about two years ago it was not running and I ended up replacing the plugs, wires, coil, distributor module and even the ECM and it ran fine.
I am wondering if the battery cable shorting out as it became disconnected could have shorted or killed the ECM?
Any thoughts?
Thanks!
I finally got a chance to check a couple thing yesterday and after little checking and I can hear the fuel pumps cycle when the ignition is turned on. After a little more checking I found I had no spark. When I bought it about two years ago it was not running and I ended up replacing the plugs, wires, coil, distributor module and even the ECM and it ran fine.
I am wondering if the battery cable shorting out as it became disconnected could have shorted or killed the ECM?
Any thoughts?
Thanks!
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Junior User
Joined: Jun 2014
Posts: 53
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From: Ohio
Sorry.
1990 F-Super Duty, 2 WD, 460 Gas, Automatic.
Today I checked the harness plug the goes to the coil and while I don't have any spark coming out of the coil I do have 10.58 volts at the plug. I changed the coil but no luck. I am going to look at the ICM to see if its bad or not. If its good I don't see any other choice than to replace the ECM unless anyone has any other suggestions.
Thanks again!
1990 F-Super Duty, 2 WD, 460 Gas, Automatic.
Today I checked the harness plug the goes to the coil and while I don't have any spark coming out of the coil I do have 10.58 volts at the plug. I changed the coil but no luck. I am going to look at the ICM to see if its bad or not. If its good I don't see any other choice than to replace the ECM unless anyone has any other suggestions.
Thanks again!
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
What may have happened is the voltage spiked when the negative lead came off the battery, or if it shorted to the (+) terminal.
Definitely check the ICM, but also - make sure you have voltage at the ECM, you might want to just check all the fuses (and fusible links) before you go too far.
Report back
Definitely check the ICM, but also - make sure you have voltage at the ECM, you might want to just check all the fuses (and fusible links) before you go too far.
Report back
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Does the spark return if you unhook the ECM (PCM) and crank the engine?
Yes if the battery is disconnected with the engine running the voltage can spike higher than 100 Volts and fry a lot of items.
Yes if the battery is disconnected with the engine running the voltage can spike higher than 100 Volts and fry a lot of items.
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Junior User
Joined: Jun 2014
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From: Ohio
I'll check tonight. I didn't realize the spark could come back to the coil/plugs if I disconnected the PCM and tried to crank the engine.
Does this mean the PCM or the ICM is bad or both?
Does this mean the PCM or the ICM is bad or both?
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
If spark returns when the PCM is disconnected it means either the PCM is bad, no power to the PCM or no ground to the PCM.
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