BlkndGoldCutlass Posted July 26, 2013 Report Share Posted July 26, 2013 I have a 1993 Lumina Z34 obviously with the 3.4l lol. Ive been having trouble trying to figure out what her deal is. When i start her up she runs and drives fine. When it reaches operating temp the idle is really wacky and when driven it bucks and studders until you make it to about 20mph. When coming to a stop it may stall. In the past 1000 miles ive replaced plugs, wires, all injectors, fuel pump, fuel filter, plus the timing belt was redone 5000 miles ago. I know the O2 sensor is bad b/c it wont come out of open loop and im in the process of replacing it but im not thinking thats my issue. Any help would be great! Thanks Guys! Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted July 26, 2013 Report Share Posted July 26, 2013 If you know the o2 is bad, start there. But could be heat soak in the coil/ICM area. Quote Link to comment Share on other sites More sharing options...
BlkndGoldCutlass Posted July 27, 2013 Author Report Share Posted July 27, 2013 yeah im going to go ahead and replace that. The other possibility that ran through my head is that the Catalytic converter may be bad? Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted July 27, 2013 Report Share Posted July 27, 2013 fix o2 sensor before you actually do damage the cat, if it isn't already. Quote Link to comment Share on other sites More sharing options...
Garrett Powered Posted July 27, 2013 Report Share Posted July 27, 2013 what does the battery voltage and RPM dip down to during the event of the problem? if you have a datalog of the narrowband signal before and after replacing the O2 then you will be able to see if there is any change. Quote Link to comment Share on other sites More sharing options...
BlkndGoldCutlass Posted August 7, 2013 Author Report Share Posted August 7, 2013 i replaced the o2 sensor no change. turns out i had a faulty new fuel pump. just had to replace it again:confused: Bubinga 1 Quote Link to comment Share on other sites More sharing options...
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