This is concerning my '88 Formy, 350TPI. A couple of weeks ago I replaced my ECM, MAF, and burnoff relay while solving a code 36 and 33 problem. Car's fine for the next couple of weeks, no SES light to speak of, and then I finally get it out of the city and onto the highway. The light comes on about 20 minutes down the road. I pulled right over to flash the codes, not even 5 mins after the light came on.
First code pulled was the 32, which I was expecting to happen sooner or later, then that code 36. Is there a logical reason that these two would trigger at the same time?

 

8T4,

It's probably unrelated, unless you have a grounding problem at the engine or ECM. The '32' is for an EGR system failure.

Check the electrical connector at the EGR solenoid, and for the EGR diagnostic temperature sensor. They are very close to the distributor, and you may have inadvertently disconnected one.

The ECM will scan the sensors and loads to make sure they are connected. If there is an open load (solenoid or relay), the ECM will set a code. If there is a shorted or open sensor, the ECM will also set a code.

The more common failure of the EGR valve only occurs at low RPM part throttle cruise, when the valve should be open but isn't for whatever reason. The only way to generate a '32' right after startup is to have a failed or disconnected solenoid or shorted EGR diagnostic temperature switch.

Since it didn't occur until after you were driving, chances are the solenoid and temperature switch are O.K. The temperature switch is a little more suspect, but either way you should diagnose the EGR system from scratch to be certain.