Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1987 Ford Mustang L4-140 2.3L SOHCFACTORY OEM SERVICE PROCEDURE
Computers and Control Systems: Service Precautions
*** UPDATED BY TSB# 90-11-06
Electronic control modules, including EEC processors, may be damaged if the negative battery ground cable is not disconnected before arc welding is done to the vehicle. This occurs because the arc welding process can produce high electrical currents in the body of a vehicle when the negative battery ground cable is left connected.
CAUTION: DISCONNECT THE NEGATIVE BATTERY GROUND CABLE BEFORE USING ANY ELECTRIC WELDING EQUIPMENT
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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