Ryan Pederson Posted December 18, 2023 Share Posted December 18, 2023 I have a 2015 sierra 1500 5.3 started running horrible unhooked neg battery cable let set 10 min hooked back up and runs good drove around for about 20 min parked truck let set overnight now runs horrible again stft goes in the negative also ltft also goes in the negative and truck dies Quote Link to comment Share on other sites More sharing options...
rav3 Posted December 19, 2023 Share Posted December 19, 2023 How many miles? Any work done? Last tune-up? Ever clean throttle body? And codes? Are you in the rust belt? This could be from many things. Quote Link to comment Share on other sites More sharing options...
Ryan Pederson Posted December 19, 2023 Author Share Posted December 19, 2023 181000 miles cleaned maf and throttle body new plugs and wires new oxygen sensors Quote Link to comment Share on other sites More sharing options...
rav3 Posted December 19, 2023 Share Posted December 19, 2023 (edited) When you cleaned the TB, did you reset the adaptation? Edited December 19, 2023 by rav3 Quote Link to comment Share on other sites More sharing options...
Ryan Pederson Posted December 19, 2023 Author Share Posted December 19, 2023 Not sure I drove it for 20 min let it set over night and it runs terrible again Quote Link to comment Share on other sites More sharing options...
rav3 Posted December 19, 2023 Share Posted December 19, 2023 I found these videos, might help you Quote Link to comment Share on other sites More sharing options...
Ryan Pederson Posted December 19, 2023 Author Share Posted December 19, 2023 Thanks will give it a try Quote Link to comment Share on other sites More sharing options...
Ryan Pederson Posted December 19, 2023 Author Share Posted December 19, 2023 Did tb relearn idling at 600 rpm drove for 20 miles and these are my readings Quote Link to comment Share on other sites More sharing options...
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