redemn93
10-02-2009, 09:20 AM
so my tahoe has 125k miles on it. i just replaced the plugs with the delco replacement iridiums last night. wires also cause most broke while removing them. i am pretty sure they are the factory plugs. delco calls for a .040 gap and these were worn to .060 (some a little more, some a little less).
i am concerned because i have only gone 150 miles on half a tank. i have been driving it a little hard but nothing that should have eaten gas like that. i also dropped in a K&N and new fuel filter. next week i am going to remove and clean the TB and change the PCV valve. im reading that you guys say a tune helps a good bit with MPG?
now to the point. with 125k miles, should i change the o2's even though i have no CEL? is there a set (front or rear) that affect MPG the most? or just dont mess with it until i get a light?
once i get all the maintanance and small problems fixed i would like to do headers, exhaust, and the airbox mod with a smooth tube to the throttle body. maybe a ported TB and a tune. all in due time. thanks for any help!!
i am concerned because i have only gone 150 miles on half a tank. i have been driving it a little hard but nothing that should have eaten gas like that. i also dropped in a K&N and new fuel filter. next week i am going to remove and clean the TB and change the PCV valve. im reading that you guys say a tune helps a good bit with MPG?
now to the point. with 125k miles, should i change the o2's even though i have no CEL? is there a set (front or rear) that affect MPG the most? or just dont mess with it until i get a light?
once i get all the maintanance and small problems fixed i would like to do headers, exhaust, and the airbox mod with a smooth tube to the throttle body. maybe a ported TB and a tune. all in due time. thanks for any help!!