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99 B4000 4.0 4X4 - NO SPARK

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Old 05-16-2018, 02:02 PM
signal34
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Angry 99 B4000 4.0 4X4 - NO SPARK

My dreadful story begins after loading the truck up to head off onto vacation and when I went to start the truck, the motor turned over but did not catch. Not the least. I thought that maybe I was having fuel pump issues again after just having it replaced just a few months ago. So... I sprayed some starting fluid into the intake and attempted again. Nothing, just turned. Fast forward past vacation I checked for spark with a spark tester, nothing. I thought that maybe my camshaft positioning sensor had crapped out (for the 2nd time) so I replaced that and well... that's why I'm here. It should be noted that I have already replaced the coil pack and up to last week I had no codes showing. Any advice would be much greatly appreciated.
 
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Old 05-17-2018, 12:55 AM
pawpaw
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Welcome to FTE.
When you turn the ignition to On, before cranking the engine, do the dash warning lights turn on & go through their checks & do you hear the fuel pump run for a couple seconds to prime the system & turn off? If not, look in the under hood power distribution box, drivers side back against the firewall & thump the PCM power relay, or maybe try swapping it for a like one not needed to run the engine, like the horn, or AC power relay & see how it goes.
You should have trouble codes, the only reason you wouldn't is if the ECM isn't getting power & relays are a known Ford problem part, or if the ECM has gone belly up & that's Not common.

If no joy with the ECM power, with the ignition On, check for 12 volts B+ at the coil pack electrical connector & let us know what you find.
 
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Old 05-18-2018, 04:09 PM
signal34
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PAWPAW,

Prior to seeing your post, I had taken off the crankshaft positioning sensor to test but after seeing your post, I reconnected said sensor then proceeded to give the PCM a good thump and.... would ya just look at that. It did the trick. So I took that as a telltale sign and purchased a new relay and swapped them out. I do appreciate the information you provided.
 
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Old 05-18-2018, 05:12 PM
pawpaw
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Good trouble shooting find, fix, feedback & to hear all now seems well & your on the road again!!!
 
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Old 05-18-2018, 07:26 PM
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If you still have the parts you've replaced, they're likely good, so now maybe you have some spares!!!!
 
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