Can a tachometer cause a misfire?
If the Tach is getting involved and any misfire problem then it is almost always your coil. Check all the connections to the coild and check the OHM on the coil. It is either the wires (usually the ground) are making bad contact or the coil is just finally giving up the ghost.
What causes a tachometer to jump?
Usually a loose or failing switch will also cause the car to run poorly, but if the problem is very minor it can begin as an erratic tach signal. Look for corrosion, a broken wire, or a loose connection anywhere between the coil terminal and the tachometer.
What does it mean when your RPM gauge jumps?
When the transmission develops a leak and fluid levels fall, a vehicle will begin to rev at higher levels as a result of the gearbox band or torque converter slipping. The vehicle may also experience irregular or delayed gear shifting. A manual vehicle experiencing this difficulty may be related to a slipping clutch.
Why is my tach jumping at 5000 rpm?
I put my MSD box and my Auto Meter tach and speedo in and mine kinda does the same thing… when first started the needle jumps about 2000 rpms and then goes away when it warms up a bit. Also, at about 3000 rpm it will jump around 500-1000 rpms.
Why is my tach jumping on my MSD?
A bad pickup coil will cause erattic tach behavior but will also cause erratic missing, bogging, engine dieing while idling, and other various ignition related problems. An MSD uses the same pickup coil that your stock ignition system uses so the procedure is the same. Ludicrous speed, GO! I had a similar problem with the tach in my 73.
Where does the misfire come from in a car?
There are times when the misfire might not even come from your engine. It could come from the transmission instead. If your car starts to jerk around like an engine misfire had occurred, your transmission may not be able to adequately shift up or down.
What to do if your Tach is jumping?
Take off your distributer cap and pull the rotor off, then locate the connecter beside your distributor where the wires connect to the distributor. Disconnect the wires at the connection, using an ohm meter check the resistance of the wires coming out of the distributor, right this number down.