Mustang V8-302 5.0L COBRA (1995)
Distributor Cap: All Technical Service Bulletins
Radio - Distortion/Poor Reception/Whine/Pop
Article No.
95-9-3
05/08/95
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RADIO - "DISTORTION" - "POOR RECEPTION" - RELATED TO THE IGNITION SYSTEM - 5.0L ENGINE
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NOISE - "WHINE, POP, DISTORTION OR POOR RECEPTION" IN THE RADIO - IGNITION SYSTEM RELATED - 5.0L ENGINE
FORD:
1994-95 MUSTANG
ISSUE:
Radio interference such as pops, whine, distortion and/or poor reception may be evident on some vehicles. This may be due to any one of the following
reasons:
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Influence of aftermarket devices
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Loose ground screw at the I/P fuse panel bracket that provides the sub-woofer amplifier ground
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Loose screw on the ground strap between the engine and frame rail
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Poor splice in the harness to the rear sub-woofer amplifiers
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Poor connection at the I/P audio harness connector
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Crimp over insulation on circuits within Connector C274
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Poor seating of Connectors C278 and C280
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Loose antenna connection to the radio or in-line connector behind the glove compartment
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Poor attachment of the antenna base to the fender due to loose or stripped screws
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Poor electrical continuity of the shielded hood blanket (AM noise only)
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Corrosion on terminals of distributor cap and ignition coil (FM noise only)
ACTION:
Follow the Service Procedure to determine the possible cause of the radio interference.
SERVICE PROCEDURE
1.
Disconnect all aftermarket devices and inspect for noise in the audio system. If the noise is gone, leave the device disconnected and inform the
customer.
2.
Check the ground screw at the fuse panel bracket for tightness. Refer to the 1995 Mustang Service Manual, Page 18-01-7, View A.
3.
Ensure ground screw (at the ground strap between the engine and frame rail) is tight. Refer to the 1995 Mustang Service Manual, Page 18-01-19.
4.
"Wiggle Test" the audio harness at the "Y" Splice located under the back seat. If noise can be introduced into the audio system, install the Overlay
Harness (F5ZZ-14588-B) (MACH 460 Sound Systems only) for sub-woofer amplifier.
5.
Disconnect and reconnect Connector C275. Refer to the 1994/95 Mustang EVTM, Page 151-8, Grid Area F4, for the location (MACH 460 Sound
Systems only).
6.
Disassemble connector shell and inspect all circuits in C274 (refer to EVTM, Page 151-9, Grid Area F3) for crimp-over insulation concerns. If
insulation crimp-over is found, cut off the terminal end, restrip wire and reconnect terminal. Reassemble the connector shell completely.
7.
Disconnect and reconnect Connectors C278 and C280 at the back of the radio. Refer to EVTM, Page 151-10, Grid Area A5, for locations.
8.
Check to ensure antenna connection to the radio is secure. Ensure antenna in-line connector behind the glove compartment is secure.
