1999 Acura CL Question: I recently had a tune up and now my milage has dropped,
my mechanic has worked on this car for 9 years can't figure it out??? new pc valve, timimg belt,gold spark plugs, new acura wires, tires great, new air filter, oil change, ozegenators. no codes come up??? - Brandi1
Could be a combination of several factors...one is the fuel is not the same you are burning before. 10% ethonol cuts mileage plus other changes in fuel blends thanks to Uncle Sam. Car is older now so that is going to be less mileage due to carbon build up on valves and normal wear in engine. Has other maintenance been done at proper intervals?.... like valve clearance checked and replacement timing belt. Some other basic things to check is wheel alignment and air pressure in tires. - milesauto
all maintence has been done. timing belt 5 months ago. The concern is that prior to "tune up" car was getting 21 mpg day after 16mpg??? tires 8 months old, first thing I checked was tires, air filter, oil, and gas. olny thing different on this tune up was the pcv valve replacement. - Brandi1
You could take it back to whomever did tune up and have them check for anything that they did that may of changed. Hard for me to imagaine what they could have changed other than spark plug gap or intervertaly distrurbed something.