Originally Posted by resmn12
i have a tach problem. sometimes it works and sometimes it dont. i read on hear someone said it was a cam position sensor so i replaced it but the tach is still acting up. i checked all the wiring and found nothing wrong. so what could it be now i have ran out of things to check.any help would be nice. thanks
If your not getting a code, then check the "tach test port" near the EEC test port at the passanger side firewall, make sure the plug is firmly in place. I beleive, it is a jumper plug. First and cheapest thing to check.
My tach would jump and drop out from time to time. I replaced the cam position sensor and it didn't help, I replaced the crank sensor and that didn't help. I replaced the DIS and fixed the problem. Every time the tach would quite I got a "SPOUT grounded" code from the computer, code 212 (for my 91 with EEC-IV) I think. DIS is the most expensive fix, dealerships want as much as 325 bucks for a DIS.