PROM - Detonation During Throttle Movement
Bulletin 85-6E-5ADate Apr. '85
Ref. No. 85-126A-6E
SUBJECT: DETONATION (SPARK KNOCK)
MODELS AFFECTED: 1983 SKYHAWKS EQUIPPED WITH 2.0L ENGINE (VIN CODE P)
NOTICE: This bulletin supersedes Bulletin 85-6E-5 dated Mar. '85. Please discard bulletin 85-6E-5 and replace it with this one, 85-6E-5A..
This bulletin should be used when detonation (spark knock) is encountered on some 1983 Skyhawks. It should be noted that "burst" detonation (very short period following a quick throttle movement) is considered acceptable.
ELECTRONIC FUEL INJECTION 6E2-35:
1. Check base timing 0~ (by-pass disconnected).
2. Check for proper EGR per chart (Figure 1).
3. If timing and EGR system checks are satisfactory.
A. On Manual Transmission Vehicles:
^ Retard base timing to 4~ ATDC.
^ Install tune-up label, P/N 14086563.
B. On Automatic Transmission Vehicles:
^ Install PROM package:
- With Federal emissions - P/N 1226823.
- With California emissions - P/N 1226984.
^ Set base timing to 6~ BTDC.
^ Install tune-up label that is included in PROM package.
Use applicable labor operation.