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2000 Buick LaSabre misfiring
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v.pack
New User
Mar 5, 2010, 8:35 PM
Post #1 of 2
(1800 views)
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2000 Buick LaSabre misfiring
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 2000 Buick LaSabra 121K miles, 3800 series motor, codes 0300 misfire and 0131 oxygen sensor. Have replaced spark plugs, spark plug wires, pcv valve and map sensor and fuel filter. Starts fine runs fine until gets up to 55 mi. an hour and starts pulling a hill then it starts jerking, missing, in and out of overdrive, rpm go up to 3 or 4K has no power, let up off gas it jerks forward then slows down and rpm goes up then it jerks forward will just keep going like that. Can get on secondary crooked roads up and down hills around curves running 45 to 35 miles and hour and it will run fine but soon as hit main roads and speed up and start up a hill it starts back up and once it starts up it won't quit until car is parked for a while. Transmission shifts fine, no odor to fluid before having transmission fluid and filter changed, just changed. Have checked for vacuum leak with start up fluid and could not find anything. Can't figure out what is wrong it car.
(This post was edited by v.pack on Mar 5, 2010, 8:46 PM)
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nickwarner
Veteran
/ Moderator
Mar 5, 2010, 11:40 PM
Post #2 of 2
(1791 views)
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Re: 2000 Buick LaSabre misfiring
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Oxygen sensor can make any car run like this. Since it pulled a code, it should've been changed. I believe this car has 4 of them, so the code should tell which one is the trouble.
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