Skyhawk L4-121 2.0L VIN P TBI (1984)
Ignition Timing Connector: Customer Interest
Engine - Cranks But Won't Start/Starts Dies
Bulletin 84-6E-30C
Date
May, '85
Ref.No. 85-083C-6E
SUBJECT:
DIAGNOSTICS FOR COLD STARTABILITY REPAIR (REFERENCE BULLETIN 84-6E-30B DATED APRIL 1985)
MODELS AFFECTED:
1983-84 SKYHAWKS EQUIPPED WITH 2.0L ENGINE (VIN CODE P) AUTOMATIC TRANSMISSION AND
FEDERAL EMISSIONS SYSTEMS
83-84 Cold Start Modification - Bulletin
On vehicles repaired per cold startability (reference Buick Dealer Service Bulletin 84-6E-30B), normal check engine light procedures for trouble code
42 will no longer apply. This trouble code can no longer be set on these vehicles. On vehicles exhibiting the listed driveability conditions perform the
following:
CONDITION
Engine cranks but will not run or engine starts but immediately stops.
Disconnect "set timing" connector. If engine starts see code chart 42 for open or short to ground in EST CKT 423.
Hard start -10~F (-23~C) may hear metallic "knock" during crank.
Check:
-
Open circuit 906
-
Open relay ground
-
Faulty relay (will not close during crank)
Spark knock heavy loads, loss of performance and fuel economy
Check and note timing. Disconnect "set timing" connector and again note timing. No change check:
-
Open or short to ground in bypass CKT 424, See code 42
-
Relay contacts stuck closed
If the above procedures do not repair the condition, then the cold start repairs are not the cause and normal diagnostic procedures should be used.