Engine starts when cold wont restart after operating tempature

SOURCE: buick lesabre nightmare 2

• The PCM doesn't even see the O2 sensor until engine temp has reached operating temp,the vehicle goes from open loop when cold,to closed loop when warm,where the PCM uses the O2 sensor to measure the rich/lean of the exhaust content,and from that,adjust fuel richness to achieve 14.7 to 1 air/fuel ratio.So when cold,the O2 sensor is out of the picture anyways.When unplugging sensors,it can be deceitful.The PCM has a program whereas,if a critical sensor (such as the mass air flow) is somehow damaged and out of the picture,the PCM will substitue a generic value that will allow the engine to stay running.So,by unplugging the MAF,it did try to run on it's own better than plugged in,there's the problem area.The vehicle is running better with the MAF unplugged,because the MAF is likely bad,and the PCM is substituting it's generic value when it IS unplugged.Something to recheckThe PROM update is a newer program for the PCM,and likely won't fix it unless the PCM is bad.I would try a good used PCM as a last or later resort,because i have seen my fair share of defective PCM's too.I have taken some PCM's apart,and found capacitors that had gone bad and leaked all over the circuit board,mostly Honda and Mitsubishi and Chrysler though.Good luck,keep me posted.

SOURCE: 1992 Buick Park Avenue - car runs great..when it runs.

The crank sensor is located on the side of crankshaft damper/pulley it mounted on a bracket. However it think that you may have a map-sensor problem that's very common with this vehicle. The crank sensor is not hard to change at all. Good Luck get back in contact if you need more help

SOURCE: 1996 buick century 3.1 L,

unplug your mass mass air flow sensor an see what happens when running and let me know

SOURCE: Mass Air Flow Sensor - 92 Buick Century

Remove it and clean with some carb cleaner and a Q tip. Be careful with it so you don't do any damage. 9 of 10 times this will get you running again! Since signal from there is variable low voltage, you cant really bypass it!

SOURCE: car starts and runs fine then dies

ya could be a bad filter. or maybe your injectors are getting bad.