7.3 tach problem

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Jul 23, 2005 | 11:36 AM

babbler

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7.3 tach problem

when the trucks idling it reads zero and when i give it some fuel it comes up and as soon i let off it falls back to zero..

Jul 23, 2005 | 02:03 PM

justblowin'smoke

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From: sycamore, illinois

mine did that and it was the sender its by the oil fill and if i remeber right it cost around 60 dollars trough ford but that was a year ago

Jul 23, 2005 | 02:42 PM

babbler

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did it affect the shifting at all?

Jul 23, 2005 | 02:44 PM

justblowin'smoke

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From: sycamore, illinois

i have a 5 sp so i couldn't tell ya

Jul 24, 2005 | 10:38 AM

bilder12

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From: Northeastern Pa - USA

All the information pertaining to the engine speed is fed into the ecm from the tach, the speed sensor and fipl (whatever its called) and the ecm determines which gear and all that crap to make it go. You may get away with removing the tach sensor and cleaning it, reinstall and see if that helps. Pay attention to the position and if it has one, the jamb nut. the tach sensor operates on the injection pump drive gear so you dont want it tight against it. Hope this helps you out.