Skyhawk L4-121 2.0L Turbo VIN M FI (1987)
Idle Speed: All Technical Service Bulletins
Engine - Base Idle RPM Setting
Bulletin:
88-6E-14
Date:
July, '88
Ref. No.:
88-180-6E
Corp. Ref. No.: 836521
SUBJECT:
BASE IDLE RPM SETTING
MODELS AFFECTED: 1987-88 SKYHAWKS
The "minimum idle speed adjustment" in the Service Manual, Section 6E2-C2 specifies an idle setting that is too tightly held. "Minimum idle RPM" will
depend upon miles on the engine, altitude, accessory load, etc.; thus implying a broader acceptable range than currently specified. This factory set air gap
clearance (throttle blade-to-bore) should not require any resetting UNLESS the TBI's throttle body is replaced. If the throttle body is replaced, then the
following wider setting band should be used with the setting procedure specified in Section 6E2-C2.
HOT IDLE
L-4 Engine
1987
1988
VIN Code 1
450-650
450-650
VIN Code K
450-600
450-600
NOTICE:
Once the idle air control (IAC) motor is reconnected, a higher ECM controlled idle RPM overrides the base "Minimum Idle Speed" via the
TAC controlled air path into the intake manifold.
The IAC's proper count position should be checked, refer to Chart C-2C, and if necessary, reset the IAC valve position by driving the
vehicle at its "reset speed" (45 mph) as stated in Section 6E2-2C.
Use applicable labor time and operation number.
