05/17/2026
Definitely one that was a head scratcher, 2018 gmc sierra came in, with an issue of low.power amd not running the best, we found an aftermarket mass air flow sensor not reading to spec, installed an oe and truck definently ran better but found noise in the catalytic converter and tested the backpressue and found excessive, installed a new catalytic converter assembly and still had rich codes both banks, after some further testing and information found injectors replaced and the flow rates were not compatible, installed oe injectors and all readings were happy again. Thank you for your trust and business