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-   -   1999 f250 5.4 no spark (http://www.ford-trucks.com/forums/1323459-1999-f250-5-4-no-spark.html)

Himboot 07-03-2014 12:16 PM

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 :-X16

carguy94 07-06-2014 08:10 PM

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.

Bigpipes 35 07-06-2014 08:24 PM

My next move would be the cam sensor,,,

projectSHO89 07-07-2014 07:14 AM

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.

Bigpipes 35 07-07-2014 08:10 AM

Quote:

Originally Posted by projectSHO89 (Post 14488072)
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,,,

projectSHO89 07-07-2014 11:17 AM

Since a cam sensor won't cause a solid "no start" anyway, it doesn't much matter.

Bigpipes 35 07-07-2014 11:21 AM

Quote:

Originally Posted by projectSHO89 (Post 14488545)
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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