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6-2
1977 PONTIAC SERVICE MANUAL
ENGINE
LOCATIONS
140 L4 Codes A-B
Machined pad on the right side of the block
at the head parting line.
151 L4 Code V
Distributor mounting pad.
231 V6 Code C
Machined surface on the front of the block
below right cylinder head.
301-350-400 V8 Codes
Y-P-Z
Machined surface on the front of the block
below right cylinder head.
350-403 V8 Codes
R-K
On the oil fill tube.
305-350 V8 Codes U-L
Machined surface on the front of
the block below right cylinder head.
NOTE: Engine codes may also be obtained from the
scanner labels located on the covers of most V8 and V6
ENGINE PERFORMANCE
engines.
DIAGNOSIS
See Figs. 6-2 and 6-3.
INTRODUCTION
Engine Performance Diagnosis procedures are guides
that will lead to the most probable causes of engine
performance complaints. They consider all of the components
of the fuel, ignition, and mechanical systems that could cause
a particular complaint, and then outline repairs in a logical
sequence.
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