Rampage L4-135 2.2L (1983)
Coolant Temperature Sensor/Switch (For Computer): All Technical Service Bulletins
Engine - Loss of Power/Poor Acceleration
Models
1981 Through 1984 2.2L, 1983 1.7L & 1983-1984 1.6L Carbureted Engine Domestic Vehicles
Subject
Poor Performance/ Intermittent Loss of Power (Sag) From O2 Wire Leakage
Index
ELECTRICAL
Date
July 9, 1984
No.
08-16-84
P-2801-C
SYMPTOM/CONDITION
Vehicle may exhibit an intermittent loss of power (sag) while driving at steady speeds or exhibit intermittent poor performance accelerating off idle.
The above conditions may be aggravated in damp weather.
One or both of these conditions may be caused by electrical tracking at the eight-way engine harness connector. Voltage feeds may track to the O2 wire
and coolant sensor (for those models equipped with coolant sensor not switch).
DIAGNOSIS
This condition is intermittent and it may be difficult to diagnose using the Driveability Test Procedure.
^
Connect a voltmeter to the O2 solenoid green wire at carburetor and ground.
^
Connect tachometer.
^
Disconnect and plug ESA computer vacuum hose. With auxiliary vacuum supply, apply 14 inches vacuum to computer.
^
Start engine and operate until engine is at full operating temperature.
^
Raise engine speed to 2000 rpm.
Voltage should be fluctuating beyond 10 volts.
^
Thoroughly dampen the eight-way connector with a mist sprayer for up to one minute.
If voltage drops significantly, proceed to repair procedure.
Vehicles Equipped With Coolant Sensor Only
^
If voltage did not drop, additional testing is required.
^
Shut engine off.
^
With engine not running, again thoroughly dampen the eight-way connector.
^
Restart vehicle and wait 30 seconds.
^
Raise engine speed to 2000 rpm.
^
Note voltmeter. A steady reading indicates O2 System is in open loop. If so, proceed to repair procedure.
