900 L4-1985cc 2.0L (1982)
Cold Start Solenoid (For Injection Pump): Customer Interest
Fuel System - Pronounced Jerks, Charge Pressure Too High
SUBJECT:
ERRATIC OPERATION, SOLENOID VALVE 1982-SAAB APC-TURBO
ISSUE:
04/83-627
FILE IN S.I. MANUAL:
VOLUME:
I
SECTION:
2
PAGE:
151
The APC solenoid can occassionally stick in the open position. When this occurs, two symptoms are usually reported: "pronounced jerks" or "charging
pressure too high" during acceleration. Also where high charging pressure is experienced the overpressure switch may activate interrupting current to the
fuel pump.
These symptoms may be experienced with the engine warm or cold. A cold engine malfunction will be the most difficult to reproduce and diagnose.
Check the solenoid valve using the diagnostic chart in your Service Manual, Sec. 2, P.291-39. Also see "Checking the APC System in the Car",
P.291-32.
If these checks do not reveal a problem, check the hoses to the solenoid for leaks. If there are no leaks, replace the solenoid.
Road test the vehicles in the operating temperature range in which the symptoms previously occurred.