Erratic Tachometer (weird)
I'm having an issue with my tach lately.
Whenever idling in gear or in park, the tach reads unusually low. After a few seconds, it will eventually bottom out at the 0 peg and stay there. However, it may jump to ~500RPM and fall again to 0 shortly repeating this cycle as long as the engine remains idling.
The engine is not idling as low as the tach is reading. I have verified from my ScanGauge a normal RPM of ~800 in Park.
When the engine speed is raised above idle, the tach seems to function normally and read similar to the ScanGauge.
There are no CEL codes.
1999 Ranger 4.0 Sport --SOLD!--
2009 F250 XLT CrewCab ShortBed
5.4L / 6 Speed / 4.10LS