Crank no start help please

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Jul 16, 2015 | 09:24 AM

Shaunharrod1980

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Crank no start help please

I have a 1999 superduty 7.3l manual transition it will crank but not start but it will roll start I have replaced the high preasure oil pump the cam position sensor and both batteries I am currently lost as to what is making it not start when running it after roll start it will run good but every now and then it will loose power and kick service engine soon then go right back out and pick back up anyone have any ideas ???

Jul 16, 2015 | 09:25 AM

evan1242

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From: Marietta, GA

Quote:

Originally Posted by Shaunharrod1980

pulled codes?
have good healty batteries?
sounds like maybe not enough cranking RPM to start her up.

Jul 16, 2015 | 09:33 AM

Shaunharrod1980

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Quote:

Originally Posted by evan1242

pulled codes?
have good healty batteries?
sounds like maybe not enough cranking RPM to start her up.

Brand new batteries no codes in system cranks fast

Jul 16, 2015 | 09:45 AM

evan1242

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From: Marietta, GA

any way you can pull codes when the CEL comes on, or does it go away to fast?

Jul 16, 2015 | 09:47 AM

Shaunharrod1980

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It goes away fast try ed to read it while driving but it only lasts a few seconds not long enough to kick it in cpu

Jul 16, 2015 | 10:17 AM

DND58

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Joined: Jan 2007

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From: Carbondale, CO

Quote:

Originally Posted by Shaunharrod1980

I have a 1999 superduty 7.3l manual transition it will crank but not start but it will roll start I have replaced the high preasure oil pump the cam position sensor and both batteries I am currently lost as to what is making it not start when running it after roll start it will run good but every now and then it will loose power and kick service engine soon then go right back out and pick back up anyone have any ideas ???

This is classic sign of failing CPS. You said you replaced it. Most of the aftermarket CPS's are worthless and fail. You might try one from Ford.
Also, if the CEL comes on, a code should be stored. Not sure what you're using to read for codes. Most auto parts code readers are not compatable, and won't show codes.

Try posting in the 7.3 section for more responce and good luck.