Thread: MPG gone down the crapper

Is this the PCV valve by the Oil cap?

yes that is it. shake it if it rattles its good. if it doesnt than its either stuck open or stuck closed, if it doesnt rattle iwould buy a new one they are like 10.00......you can also clean yours out anyway with carb cleaner even if its does rattle. mine rattled and i cleaned it anyway and it was dirty so eh just for safe measures...i would pull the hose too and clean it

Can you please define shaking? Like shake the whole block or just the tube?

NVM, Mr. Sneakers filled me in what to do. Didn't think about taking it off... hehe

32 front 29 rear,alignment was done about a month ago so it's good.running the heater every once in a while,and no extra weight in the car.



My MPG has been the same since I got the car up until three weeks to a month ago.I always warm the car up to at least 120 degrees before drivingThe 900rpm idle is due to Prothane motor mounts cuts down on vibration a little.When I checked the ECU this morning no codes were shown.I also put in a new Bosh o2 sensor back in June.

to check pcv with it still on the car.
Per FSM,
with the car idling, pinch the hose that connects to the PCV, your idle should drop. If it doesnt, you have a bad pcv.

just pull out the pcv valve and shake the pcv valve, if it rattlesl ike a rattle can its good. personally the fsm i wouldnt be able to pinch that pcv tube its pretty hard lol.. either way would work, i would still clean it either way becyase they can flow and still be dirty, mine was dirty and it helped with my idle after i cleaned it

Will try both methods tonight, the hose is pretty thick to just pinch haha

Well checked the PCV valve it's good.So now back to square one going to change the fuel filter tomorrow to see if that helps any.

re-ground your maf. That made a big difference for me.

Oddly...I only got about 20 mpg to my last tank of gas. I about cried. With high gas prices and the income of a cheap college student, I can't take it. The only thing I did different was add a little fuel injector cleaner...I know it's not great for the car, but I thought getting 23-24 was bad so it was worth a shot. Plus...it just started getting cold here in south east Ohio the past week or so now, so that has to come into play.

It also doesn't help that I can't figure out my High Idle for the life of me either...1100-1700rpm!!! Horrible