[Galane]

The ECM in the 1994 and 1995 Buick Century with 3100 V6 is apparently unique to that application. It's OEM number is 16196387

The inventory software that salvage yards use claims that the ECM from the 94 and 95 Oldsmobile Cutlass Ciera will work, but that's the only place I've seen that so I really don't trust it. (It has plenty of errors, such as claiming major body parts from the Chevrolet Corsica are the same as the Oldsmobile Acheiva.)

I was looking into getting one of Innova's OBD1&2 scanners, downloaded the manuals and guess what? The 94 and 95 Century is NOT supported.

What also doesn't work is any sort of jumper at the ALDL to make it blink out codes.

There must be something I can plug into this thing and at least get a trouble code number!

Digging around various web fora, the difference seems to be that other applications of the 3100 in 94 and 95 had an O2 sensor for each bank along with a MAP sensor and MAF, where the Century has only one O2 and no MAP, plus its MAF is combined with the throttle body instead of being a separate piece like other GMs of the 90's. Why would GM make a different setup for the Century instead of using the same as all the other uses of the 3100? Perhaps they were compensating for never changing the design of the dash between 1982 and 1996? Logic and automotive engineers seem to part ways quite often!

Since changing the engine (which thanks to GM's hinky engineering got collapsed piston skirts at the slightest hint of overheating) with another that has only 66,000 miles (1,000 less than the failed one) it wants to run hot too.

So I changed the 195F thermostat for a 180F one. Runs great but in traffic, even when it's cool and raining, the temp gauge will go up almost to the red, the fan kicks on then it drops down to just below halfway. Wash, rinse and repeat.

I'd like to reprogram the fan turn on temperature down a ways to work better with the lower temp thermostat. I don't care about it supposedly being more efficient running hotter, I care about the engine not self destructing because it simply cannot tolerate running near the limits of a 16 PSI cooling system, thanks to GM's too tight piston tolerances. It has a second fan in front of the radiator that is supposed to come on when the temp hits the bleeding edge of blowing the radiator hoses off, but it didn't work when it overheated and ruined the engine. I'd like to program that one to come on at the temp the main fan is set for. The fans will work, I've tested the relays and there's power to them, jumper the relay plugs and they run. I've also installed new ECT and temp gauge sensors.

Another thing it needs is reprogramming the inaccurate from the factory speedometer. It reads up to 3MPH faster than the actual speed, checked with GPS. Yes, it has the correct size tires, with only 5,000 miles.