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Tachometer Jumping/No Reading 1989 F250

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Tachometer Jumping/No Reading 1989 F250

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Old

Apr 30, 2024 | 01:07 AM

#1

futurefarmer.az

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Trailering

Joined: Mar 2023

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Tachometer Jumping/No Reading 1989 F250

Hey guys, I have an 89 f250 with the 460 and C6; the tachometer will jump sometimes, but I won't read most of the time. I've heard about faulty grounding by the coil. Does anyone know what I should look at with this first? Thanks

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Old

Apr 30, 2024 | 07:01 AM

#2

rla2005

Fleet Owner

Joined: Oct 2005

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From: Kentucky

If the engine is not skipping/missing when the tachometer is jumping, the problem is the tach itself not the signal to the coil from the PIP and ICM.

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