Re: another p0300 question
I agree a better scanner will help but why not buy a programmer instead of a scan tool. My Diablo Predator help me to diagnosis alot of codes,, besides checking and clearing codes it has live feed. It also a programmer and corrects tire sizes, changes shifts point, etc...It was about $350 great all around investment.
My P0300 code was a clogged cat which I replaced both with Magnaflow high flow cats that I got on amazon.com for $75 a piece and just had to cut the old ones out and weld the new ones in.
What year and how many miles on your Hummer.
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Rancho 4" lift-Rancho Dual Shock-MC2 Rims-Mud Grapplers-Gobi roof rack-Piaa Offroad light-Piaa FU lights-10"TV-Brushguard-Gobi ladder-Taillight guards-Hi-Lift Jack-PC Swaybars-Custom stereo-Blacked out taillamps, blinkers, marker lights and Roof marker lights-Purple Cranium Spider-License plate mod-Magnaflow Hi-Flow Cats & Cat Back Exhaust-DRL Mod-Cb w/Dual Whips
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