Scoupe L4-1468cc 1.5L SOHC VIN J MFI (1994)
Good, clean grounds are essential for proper engine control management Poor or dirty grounds can produce false sensor signals to the ECM that can
result in driveability problems.
1.
Remove and clean the three ECM ground bolts on top of the intake manifold. Apply dielectric grease to the bolts and ground terminals.
2.
Remove the negative battery cable to the engine block mounting bolt. Clean the threads and cable contact surfaces, apply dielectric grease to the
cable ends and bolts then reinstall.
KNOCK SENSOR
The knock sensor effects ignition timing. When a knock signal is detected, the ECM retards the timing which will reduce the power of the engine.
Correct knock sensor torque is critical to its proper operation. If the torque is too high, the knock sensor may pick up false signals.
1.
With the engine at operating temperature, measure resistance between pins 1 and 2 of the knock sensor connector (component side). Resistance
should be between 4.75 and 5.0 M ohms. If resistance is not within specification, check knock sensor torque.
2.
With the engine at operating temperature, loosen the knock sensor from the cylinder block and re-torque to 12-14 lb.ft.
If re-torquing the knock sensor does not remedy the problem, re-route the knock sensor wiring to prevent EMF induction. See TSB 93-36-012 for
complete diagnosis of the knock sensor.
