I got this car for free and just got it running. The tach did work when I first fired it up, but is no longer doing so. Any wire I should look for? Maybe I knocked something loose when I replaced the oil filter?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
1981 Corvette has an electical tachometer that is driven by impulses from the distributor. First, check for blown fuses, next make sure the tach wire is plugged into the distributor. Next bypass silver tach filter or capacitor located by manifold to see if the tach moves at all. If these steps do not reveal a change in tach operation, then the most obvious next step is to remove the tachometer and get a new board for the tachometer. Unscrew and remove cluster lens and then unscrew tach bezel, and gently pull out the tach noting position of insulators. I believe these boards are available still at local autoparts locations. Replace board, note position of insulators and reinstall tach, bezel and lens. Old corvette are cool and are pretty easy to work on! Should be fixed, enjoy!
bad tach, seems .
bad tach, or bad wires to it or power to it bad.
i dont know what engine option you have
but most use the ignitor signal to do this.
later about 1996 the ECU uses CKP sensor to run the tach directly
in that case bad tach, bad wires to tach or bad power feed to it.
it only has 3 wires.
one is bad, or its bad.
If the tach was an option for your corolla, it is very likely that the wiring harness in your car would have the connector for the tach. They would use the same wiring harness to cut costs, and whatever is not used would be left open on a car without a tach. You will have to find a wiring diagram to check for the tach connector-it would be up under the dash leading to the cluster. In earlier days, tachs were connected to the coil's negative side of the primary circuit.
The tach runs off the coil voltage. One of the tach wires would go to the neg side of the coil, I think. You may need to look for a shop manual to get the wiring diagram. Car clubs would be a good place to start.
Yes it can be what it is doing is called hunting, As for your RPM tach it has nothing to do with it, Now your transmission is a 4L60 and YES it does need a tach signal or the RPM signal it doesnt matter if your Tach gauge doest work but it need the tach signal for the transmission to work. And NO there is NO VSS it needs TACH. or it will hunt for a shift that is why its doing this.Youll need to restor the TACH to the transmission so it can shift properly, Now youll either have a 4pin connection,1 wire or youll have a 4 pin 2 wire connection or youll have a 4 pin 3 wire connection This transmission need tach signal so bear with me i am going to some how draw it pretend your looking at the switch. connection
I A B I
I C D I Okay the C is TACH that has to work
wire that goes to the starter not the main wire there is a smaller wire that sends electric from the switch to the starter solinoid might be shorting out (skinned wire between the starter and the ignition switch/fusebox