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For a 1987 mazda i think there is only one o2 sensor thats located in the exhaust manifold if not follow the exhaust down and it will be in the exhaust pipe before the converter, heres a picture of it and this will help you find it.
In the 87 model the check EGR light was triggered by mileage to get you to have the EGR cleaned and serviced. In 87 they didn't have differential pressure transducers or smart computers to monitor EGR performance. On the right Side of the dash there is a square hole plug about 1 X 1.5 inches square it's behind your key ring if the keys are in the truck looks like it's for a factory option switch that you don't have it matches the one on the left side for the emergency flasher switch. Pull it out and look in the back of the hole at the top there is a black switch I can't remember if it resets the EGR Light or just checks the light Play with it and see of it turns off your EGR light.
when you do a tune up check all engine fluids check the cooling system.inspect and test battery.check all underhood hoses. check and adjust the drive belt.check the air filter.check pvc valve. replace the spark plug wires.replace spark plugs.replace air filter. replace fuel filter.check the fuel system.check the ignition timing.check the charging system.and check the egr valve.
hello, if you have a vacuum pull off choke, you can try replacing your thermal vacuum valve on the intake manifold, it fits with the slow rpm..s at cold start!! Good luck, cheap repair if it works for ya. marty