Quote:
Originally Posted by 98koukile
Not on an S14 my friend. I don't even have a speed sensor and my tach works. Check the CAS on the top of the transmission right behind the engine. It measures the flywheel speed to show your RPM
|
Oh shit! How the hell does my rpm gauge work? I don't have that on my tranny! Lol.
On an S14 the RPM signal comes from the distributor (internal coil). Check your distributor plug and look for any pins that may not be making contact. I believe the problem itself may lie in that or your cluster. If you have a spare distributor, just install it and see if that's it. If it's not then it's the cluster. If that doesn't work then the problem must lie in the wiring itself. Download the FSM and check the wiring. That's what I'd do.
Also, the CPS (Crankshaft Position Sensor) does not read RPM. This was taken directly from the FSM:
"The crankshaft position sensor (OBD) is located on the transmission housing facing the gear teeth (cogs) of the flywheel (driveplate). It detects the fluctuation of the engine revolution. The sensor consists of a permanent magnet, cor and coil. When the engine is running, the gap between the sensor and the gear teeth (cogs) will periodically change. Permeability near the sensor also changes. Due to the permeability change, the magnetic flux near the core is changed. Therefore, the voltage signal generated in the coil is changed. The ECM receives the voltage signal and detects the fluctuation of the engine revolution. The sensor is not directly used to control the engine system. it is used only for the on-board diagnosis of misfire."