Trevor Posted September 22, 2009 Share Posted September 22, 2009 Something weird in my 1992 Ford Exploder V6 5 speed 4X4 295K miles. I googled and searched the Ford truck forums and didn't find any answers there. The tach in my daily driver (factory in-dash analog) started reading about 1,500 RPM too high about a month ago. It is off that amount at any RPM (except off - still = 0) so its more of a linear error than incremental. The engine is turning normal speeds and the clutch isn't slipping. The Last work I did on it was replace the alternator 3 months ago. It didn't creep up gradually, I just noticed it from 1 day to the next. For about 10 miles this morning it was reading correct again, then I saw it bounce up and go back to 1,500 too high. Could it be mechanical? a weakened 18-year-old return spring? sticky bushings? Electrical? fading voltage regulator voltage regulator (a guess my 1966 Mustang has one - uses 5V for the dash gagaes) Ignition? coil pack sparking an extra pulse 66% of the time? thanks for any ideas! Quote Link to comment Share on other sites More sharing options...
Zerocell5688 Posted October 10, 2009 Share Posted October 10, 2009 Something weird in my 1992 Ford Exploder V6 5 speed 4X4 295K miles. I googled and searched the Ford truck forums and didn't find any answers there. The tach in my daily driver (factory in-dash analog) started reading about 1,500 RPM too high about a month ago. It is off that amount at any RPM (except off - still = 0) so its more of a linear error than incremental. The engine is turning normal speeds and the clutch isn't slipping. The Last work I did on it was replace the alternator 3 months ago. It didn't creep up gradually, I just noticed it from 1 day to the next. For about 10 miles this morning it was reading correct again, then I saw it bounce up and go back to 1,500 too high. Could it be mechanical? a weakened 18-year-old return spring? sticky bushings? Electrical? fading voltage regulator voltage regulator (a guess my 1966 Mustang has one - uses 5V for the dash gagaes) Ignition? coil pack sparking an extra pulse 66% of the time? thanks for any ideas! I had this issue wiht a 1993 Mustang and i ended up replacing the little Ignition control Module on the Intake Manifold. That sends the signal too the tach and its possible it may be going is the car acting foolish at all or running rough or anything like that?~J Quote Link to comment Share on other sites More sharing options...
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