Hey Datsun People,
Last attempt to solve before taking it up north and seeing what 5.56x45 can do to Japanese steel.
Vehicle: 1981 280ZX, AT, NA, 45,000 original miles.
Ignition- coil, wires, plugs, cap and rotor.
Fuel- pump, filter, injectors
Emmisions- TVV at ERG, O2 sensor, all vacuum lines
Engine: intake/exhaust manifold gasket
Coolant: water pump, thermostat
Tune up: filters, valve clearance (cold/hot), timing, idle speed, all new fluids
Checked: air flow meter, MAF sensor, cleaned all electrical contacts on temperature sensors, compression, fuel pressure, no vacuum leaks that I could find.
Issue: The car idles rough where the car shakes quite noticeably. The car pulls fine and is fine at driving speeds. No knocking or strange sounds coming from the upper or lower end other than typical L28 sounds. When reving the engine it does sound a little more high pitched than what I am used to hearing with engines. Why is this car idling like crap? Please help been at this for months. Thank you. Located on northwest side of Chicago if anyone local wants to take a crack at this sucker. I have beer.
Feel free to point out any errors in my thread, preferably in a constructive way. Thank you again.
Note: The EGR valve actuates when it shouldnt during warm up. So I plugged the vacuum line entry to the manifold, as well as the vacuum line entry to the EGR valve. Not sure why the EGR valve misbehaves during warm up. The TVV I replaced seems to be functioning properly and I am 99.4% sure the vacuum routing is correct.