Tachometer works intermittently, what could cause this? on 1999 Ford Explorer

by in Chesapeake, VA on August 05, 2014
1 answer 3 comments
ANSWER by on August 05, 2014
Faulty tach , faulty wiring/connection or faulty sensor. Testing , may help isolate source of problem.
COMMENT by on August 05, 2014
Thanks. Just bought it and noticed tach fluctuating and then quitting on the way home. Was thinking a loose ground possibly, but will check what you said.
COMMENT by on August 05, 2014
Thanks. Just bought it and noticed tach fluctuating and then quitting on the way home. Was thinking a loose ground possibly, but will check what you said.
COMMENT by on August 05, 2014
It could be any number of things as I said , but , yes any grounds or harness connections in the circuit could be suspect with the symptoms you describe. IF it's in a connector , simply unplugging and plugging back in may take care of it(this includes where the gauge cluster plugs in). If it totally quit working , the best way to determine the cause , may be to have a scanner hooked up to monitor sensor input.