Question about 1991 Buick Regal
1991 Buick Regal with 3.1 V-6. Car ran fine, then started stalling under acceleration. It would do this spotatically for a couple of days, but then got more frequent. It would always crank back up and run. Sometimes it would do it when coming to a stop, and sometimes at highway speed. I replaced fuel filter. No change. I cleaned the air filter, and throttle body area, along with butterfly of fuel system. No change. Finally car stalled, and would only crank, then die immediately. I insalled a fuel pump. No change. I installed MAP Sensor. No change. I installed Throttle Position Sensor. No change. Put in 6 new spark plugs w/ new wires. No change. Checked fuel pressure, exactly 40psi with key turned to "on" position. I then cut the exhaust pipe in front of the catalytic converter to bypass it. The car cranked up , and seemed to run fine. I drove it around the block a couple of times, and then let it idle a few minutes in the drive way. It was extremely loud, but it ran. I welded a new pipe in place of the converter, turned the key, and back to crank and die immediately. It will run if you spray starter fluid in plenum, but not on it's own. I am now totally lost??? Any help?
You need the exhaust converter so the O2 sensor can
It sounds as though the converter is blocked,as well
as the fuel trim, if that is correct term for an OBD1 System,
is not able to report back the oxygen in the failed converter
So the ecm can not provide the correct fuel mixture by
pulsing the injectors
I would also expect the timing chain to have a lot of slop
& possibly be off a couple teeth, from worm plastic gear
Posted on Sep 05, 2012
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Posted on Jan 02, 2017
Hi, first thing, is your check engine light on? if it is, you can check the codes yourself, get a paper clip unfold it so you got 2 straight ends, find your dianostics port where you plug in the scanner, take the paper clip and stick one end into the one on the far right and the other to the one next to it and turn ignition key to on position, check engine should start blinking if not move the last end of paper clip you plug into the next one in port until it does( turning key off each time before you move paper clip end) do this procedure until the light starts to blink. When it blinks count the blinks, for example it will blink one time than a pause than blink twice quick which means 12 and so on. It will start out with a 12 which means the computer is ready to give stored codes. Just write down the codes and either take them to napa, or auto zone, or to a shop you know, and they can tell you what they mean. On a car that old it could be almost anything, parts wear out, but right now what stands out to me by your description i would check the cadalitic converter it might be plugged. Take some advise get someone that knows something about cars or at least works on them on a regulator bases. That way your not playing a gessing game.
Posted on Sep 24, 2010
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