Pontiac Fiero 1988 Service Manual page 1162

R A D I O
For more detailed noise repair procedures con-
sult the Delco Sound Service Guide. Service
procedures are given for:
• Accessory noises
• CB Antennas and noise
• Computer noise
• Windshield Antennas
° Shielding of wiring and components
• Locating vehicle noise
BRAIDED GROUND
STRAP
TO S T E E R l i G
COLUMN
Figure 1 - Cut the B L A C K (ground) wire from
the black plug at the back of the Radio and
run a braided ground strap from the case of the
Radio to a good, unpainted body ground.
TO GROUND
(TRY GROUNDED AND UNGROUNDED)
TO FUSE BLOCK
OR SOURCE OF NOISE
POWER OR ACCESSORY
(IGNITION OR MEMORY)
Figure 2 • Install a 1224205 filter package.
ALTERNATOR
OUTPUT LEAD
2 1 0
MFD
100W C A P A C I T O R
Figure 3 - Install a 250 MFD 100V capacitor on the
alternator output lead to ground.
IGNiTOM NOISE
Try the following fixes in the given order.
1. Check for loose or defective spark plug wire.
2. Check for defective spark plug.
3. Move all wiring away from HEI and spark
plug wires.
4. Reroute spark plug wires laying against any-
thing that could possibly transmit noise to
the Radio (car wiring or sensor leads that
travel into the passenger compartment).
5. Replace distributor cap and rotor.
6. Check the ground from engine to firewall;
install a braided ground strap if necessary.
7. Install a braided ground strap on the hood.
8. Check heater core ground; clean or install
braided ground strap if necessay.
9. Check air conditioner accumulator ground;
clean or install a braided ground strap if
necessary.
(Continued on next page)