His car should have a 7730 which is a pretty decent ecu for OBD1 american cars.

Does your car have a temp gauge? I had a thermostat stuck open on a Fiero with a 60* and it would never go into closed loop.

I did that a few days ago and it was bone-dry... and then I realized that I would probably be better off doing it right after running the car, and not when it's been sitting for a few days. So I'll do it again today.
:D
I'll check & see what the FSM says about the O2.

The car has a temp gauge, and the temp is absolutely spot-on.

The FSM says the the PCM will tell me if the O2 sensor shows a lean or rich condition.

Take a fuel pressure reading then call me in the morning.A fuel pump can become weak before giving out all together.Not the same car but A Mercedes 190e common issue ,I dont know if thats why they started installing 2 pumps on their setups after 1985 but Ive owned a few to find out how this can become an overlooked issue.Do this if your check list starts to dwindle down .I believe a diagnostic cost from a shop is just one hr of labor ,this would be well worth the cost for the fact they might catch other items that might leave you stranded paying for a tow, older cars are great as long as their not on back of a tow truck for simple small shi% .Does a Buick have a flux capasitor?:)

i had a camry that had the same symptoms.the pcv valve was plugged.

i would normally agree, however i had a 190e a few years back that never set a dtc or lit the o2 sensor light. was running so rich, it burnt the cat out. i had even hooked a meter up to the sensor and saw it changing between rich and lean. threw everything else at it. finally decided at the last to replace the o2 sensor. completely different car after that.

the o2 sensor is constantly changing between rich and lean. a lazy sensor could be favoring the rich side. ( higher voltage)

you need to find someone with a scanner that will do live mode, preferably mode 6 data. often times there will be a misfire present, but it doesnt cause enough misfire counts to trigger a dtc.

also, the fuel pressure regulator test can be done while running.

Sell it and beat around in the Camry.

Or beat around in the SD. :D

Ah, I forgot to mention that I checked that, too, using to the FSM procedure (make sure it rattles, make sure it's got vacuum). It's 100% good.
Well, I already have the IM gaskets (I wanted to do them anyway, since I figure they're bound to fail at the most inconvenient point otherwise), and I already have seals for the injectors, so I'll do the gaskets and injectors first, but if that doesn't help, I may try the O2 sensor.
I'll look into that if the problem persists.
I did it right after shutdown after a 20-minute highway trip that was preceded by 15 minutes of city. Bone-dry. I assume I can put it out of my head for now?
I thought you were going to tell me to chop the roof off :D.

Oh, and I ran it up and down the highway for 20 minutes today, but just could not get it to smell like gas. I came in and was like, "Man, I just went up and down Rt. 3 in the Buick for 20 minutes but just can't get it to smell like gas! It's frustrating." My dad then asked, "Well... isn't that a good thing?"

So there's an outside chance I may have fixed by playing with the EGR. I'll be doing a 70 mile trip tomorrow, so I'll measure my gas mileage and see if it improves.

Well, good call on your part... the air filter was full of crap (just like me). I replaced it (I haven't replaced myself yet, though).

My bet is on a plugged/partially clogged converter. The test procedure is pretty simple in theory, but pita in practice. A tool exists for checking the backpressure via the o2 sensor port to see how much pressure it takes to go through the exhaust. something that runs progressivly worse when warming up screams a bad converter to me.

Chop the roof off?

That's reference to what "somebody" posted a few days ago. :D

http://www.peachparts.com/shopforum/open-discussion/358634-we-were-drunk.html