My names Joel Reisinger and I am the owner of a 1987 Buick Electra Park Ave with a 3.8l V6. It has about 86000 miles on it.
When I got the car it didn't really run at all because the pre owner messed everything up. He began tinkering with the car because of black exhaust gasses. All sensors were disconnected, a lot of vacuum hoses were unplugged and there were six different spark plugs in the engine.
I connected all the sensors and vacuum lines back up and replaced the spark plugs, the spark plug wires and the oil (the old oil had a strong petrol smell).
Now the car runs but only very bad and smokey (still a lot better than when i got it). When i press the accelerator pedal sometimes it revs right up and sometimes it just doesn't want to rev and backfires into the intake. The pre owner mentioned that the car runs worse when it gets warmer which would indicate a problem with maybe a water temp sensor. But measuring them with my multimeter it looks as if they are ok (I replaced one that gave a bit of a suspicious reading). Disconnecting the MAF doesn't change how the car runs.
Actually it seems to run far too rich. Disconnecting the injectors, one at a time, didn't change the black smoke. So i don't think its a stuck injector.
Unfortunately I don't have an OBD1 tester so i can't check for any codes.
Does anyone have an idea what to check next? I am really clueless right now...
Thank you very much!