I have a feeling the same people that don't check their tire pressure also neglect their cooling systems.
Are those the same type of folks that refuse to take advice about changing out a water pump after about 100,000 miles of service just to save $50 over the next 100,000 miles?
Originally Posted By: Towncivilian
Yuck. You should clean the throttle body, the throttle body on my Pathfinder could use cleaning at least once a year... (pretty sure you're talking about the QX4 here) and yeah, a partially restricted or clogged fuel filter can definitely impact it, I noticed a huge difference when I changed my fuel filter the first time.
My father had the plugs replaced at Nissan (at exorbitant cost) and he supplied some sort of Bosch plugs as well. I swapped in OEM NGK w/ the specified heat range, but didn't really notice an improvement since the plugs were only about 30k mi used. I'll prolly replace the plugs again at 200k or 220k.
Yeah, you guessed the right car/customer. The particular plugs I pulled were only 'recommended' as 30,000 mile plugs, so after 50,000 on them and a moderately 'restrictive' fuel filter, no wonder this vehicle's mileage dropped an effective 25%. The other shop did use quality replacement plug wires, so with the new plugs finally all is right with the world again.