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1999 f250 5.4 no spark

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Old 07-03-2014, 12:16 PM
Himboot Himboot is offline
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1999 f250 5.4 no spark

Just got the truck starts when cold once driven for an hour or so it wouldnt start wait an hour starts did that for 3 weeks now wont start at all I changed crank sensor still no spark when i did crank sensor noticed wirers where cut and plug must of been replaced if its not crank sensor where do i go next plz help
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Old 07-06-2014, 08:10 PM
carguy94 carguy94 is offline
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how did you verify the no spark at a spark plug or coil. how did you find that the crank sensor was at fault did you test more than one coil. how fast doe the engine crank and get any codes pulled from the truck.
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Old 07-06-2014, 08:24 PM
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My next move would be the cam sensor,,,
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Old 07-07-2014, 07:14 AM
projectSHO89 projectSHO89 is offline
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A cam sensor will not cause a "no spark" condition. At worse, it will cause multiple starting attempts as the PCM guesses at injector timing in the absence of a valid cam signal.
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Old 07-07-2014, 08:10 AM
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Originally Posted by projectSHO89 View Post
A cam sensor will not cause a "no spark" condition. At worse, it will cause multiple starting attempts as the PCM guesses at injector timing in the absence of a valid cam signal.
True but he hasn't told us yet how he has determined he has no spark,,,
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Old 07-07-2014, 11:17 AM
projectSHO89 projectSHO89 is offline
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Since a cam sensor won't cause a solid "no start" anyway, it doesn't much matter.
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Old 07-07-2014, 11:21 AM
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Originally Posted by projectSHO89 View Post
Since a cam sensor won't cause a solid "no start" anyway, it doesn't much matter.
After rereading his original post I would check fuel pressure next since you don't think it is cam related. Still don't have an answer on how he determined he has no spark..
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