bigpapiray
Newbie
Okay so I have. 97 K2500 burban 454 bbc 7.4l...
I put Gibson headers, new 02 sensors up stream cat delete, 3” exhaust to a black widow muffler 3” single out the back, egr delete err o2 delete. Full tune up, reprogrammed/tuned(sinister performance), FPR, motor man 4squirt injectors, new knock sensors. With doing all this my mpg went from 10-11 all the way down to 6-7..... not sure why. That’s why I’m asking...
PC says knock when you are in over drive going up a hill under a load if it’s on flat land or going around town doesn’t do it. Truck has 168k miles.. runs fine, ran fine before I did all this, all the time the mileage was 10-11...
Any and all help is amazing.....
I put Gibson headers, new 02 sensors up stream cat delete, 3” exhaust to a black widow muffler 3” single out the back, egr delete err o2 delete. Full tune up, reprogrammed/tuned(sinister performance), FPR, motor man 4squirt injectors, new knock sensors. With doing all this my mpg went from 10-11 all the way down to 6-7..... not sure why. That’s why I’m asking...
PC says knock when you are in over drive going up a hill under a load if it’s on flat land or going around town doesn’t do it. Truck has 168k miles.. runs fine, ran fine before I did all this, all the time the mileage was 10-11...
Any and all help is amazing.....
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