P0171 and p0174
09-09-2014, 12:16 PM
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P0171 and p0174 Hello I have a 98 ls1 trans am. Codes p0171 and p0174 are popping up on the obd2 scanner. Does kind of idle a little rough, but sometimes my engine lights turns off and then later comes back on. Codes say bank 1 and 2 are running lean. Could this be a vacuum leak?
Any thoughts? Thanks
Any thoughts? Thanks
Last edited by Ls1dirtybird; 09-09-2014 at 12:23 PM.
09-14-2014, 11:37 PM
#2
Too much air, not enough fuel, or the O2 sensors are lying. So vacuum leaks, fuel filter/regulator/pump/injectors, or O2 sensors or wiring. Possible the MAF is dirty and thinks less air is entering the intake than actually is..clean it with MAF or electronics cleaner. Also IAC could be open when it is not supposed to. That will let in more air.