Question about 1984 Ford Mustang

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My brake lights are not working. They did work but just stopped. I checked the fuse and replaced the bulbs. What other simple checks can perform and what should I look out for? I also have a, what I believe is, a vacuum leak. The idle jumps up and down from 600rpm to 2000rpm in idle every 30 minutes or so. What could cause this? Thanks for all the assistance.

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Have a look at the top of the brake pedal under the dash is a switch. It has 2 wire connections. connect these 2 wires together and see if the brake lights operate. If they do the switch is at fault. If not there is a wiring problem. You'll need a multimeter or test lamp to check if you are receiving power to the switch and to test the wiring from the switch to the lights.
Test for leaks using carb cleaner. Spray where you suspect a leak may be. You will notice the engine rpm changing.

Posted on Sep 15, 2010

  • Rene Rossouw
    Rene Rossouw Sep 15, 2010

    Another (more probable) cause would be a malfunctioning Idle air control valve. It is on the rear of the throttle body. See here :http://www.turbotbird.com/techinfo/TPS_p...
    Give the valve a good cleaning and see if this improves the situation.
    Check for 12V at the red wire on the TPS with the engine running. Switch off ignition. Disconnect and measure resistance across the IAC valve terminals. If no reading is found the IAC is faulty. Measure resistance between the IAC and terminal point 21on the ECU. No reading is faulty wiring.

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