Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

No start

FastFreddy1970
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8 years 3 days ago - 8 years 3 days ago #16629 by FastFreddy1970

No start was created by FastFreddy1970

2003 f250 5.4 automatic

No rpm, no injector pulse, no spark. Have power but no ground.

Tested crank sensor, did not have a ac current pattern. Replace crank sensor still no start, same issues but now with an ac pattern. Was checked at sensor and ecm both times with both sensors. Checked for 5 volt ref on other sensors all ok. No codes in ecm any suggestions?

Last edit: 8 years 3 days ago by FastFreddy1970. Reason: Added info

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cheryl hartkorn
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8 years 3 days ago #16636 by cheryl hartkorn

Replied by cheryl hartkorn on topic No start

sounds like a pcm issue if you have the ac sine wave at the pcm and still no rpm. what about cam sensor signals??

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arbez
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8 years 3 days ago #16649 by arbez

Replied by arbez on topic No start

I second the computer theory.

I have done several E/F series computers around that year. Check powers, grounds, cam & crank signals at the PCM. If all is OK, put a computer in it.

Here are some diagrams to refer to:

www.revbase.com/BBBMotor/Wd/DownloadPdf?id=38315

www.revbase.com/BBBMotor/Wd/DownloadPdf?id=38316

www.revbase.com/BBBMotor/Wd/DownloadPdf?id=38318

Let us know what you find.

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