Engine - Miss on Number Five Cylinder
86cadillac05Bulletin No. T 87-41
File in Group 6D
Number 30
Corp. Ref. No. 716401
Date Dec. '86
SUBJECT: ENGINE MISS
MODELS AFFECTED: 1985-87 DE VILLE AND FLEETWOOD 1986-87 ELDORADO AND SEVILLE
Figure 1 - Distributor Assembly:
Some 1985-87 De Villes and Fleetwoods or 1986-87 Eldorados and Sevilles may experience a condition of an engine miss that can usually be pinpointed to number five cylinder with an ignition scope or cylinder balance test.
This condition may be caused by the EST wire intermittently grounding against the distributor rotor hub (Figure 1). If the EST wire is chafed and contacting the rotor hub, the circuit will short to ground, thus producing a miss. To correct this condition, replace the terminal block (P/N 1987621, includes connectors and wiring).
The terminal block and harness production routing as shown in Figure 1 may not allow the wires to lay flat in the distributor housing. When installing a new terminal block, use the following procedure:
1. Connect the wires from the terminal block to the H.E.I. module.
2. Orient the terminal block and wires to the position shown in Figure 1 with the wires separated and not overlapping.
Figure 2 - Distributor Assembly:
3. Rotate the terminal block 360~ counterclockwise (1 turn CCW) as shown in Figure 2.
4. Assemble terminal block to opening in distributor housing and install ground/hold down screw.
For warranty purposes, use Labor Operation J4430 at .4 hour to replace the terminal block.