Frosty

iTrader: (17)

What are they?

My MPG has dropped a bit lately..plus have like 10K on them...wires are in good shape(MSD's)

I did just run seafoam a few weeks back..maybe it fouled the plugs? Not sure.

But I'm trying to narrow down the parts so I'm not just throwing money at the car. What are the symptoms of a bad pcv? Thanks!

****I tried a search and nothing useful came up****

2000 TAWS6

iTrader: (1)

PCV is a one way valve. Should flow freely in one direction, and not flow at all in the other. Typically, if you shake them and they rattle, there're good.

Have never seen a bad pcv valve.

I don't know where you live, but if it has been really cold there lately, that will crash you gas mileage quickly.

Frosty

iTrader: (17)

Ok, thanks. I wasn't sure if it had anything to do with my gas mileage

....and yeah it's been cold up here

RPM WS6

iTrader: (3)

Yep. I see it happen like crazy on all my cars, when the temp drops much below freezing, the MPG goes way down.

Cody Brooks

iTrader: (2)

the shake/rattle test is not a good test. I forgot the correct test procedure I believe its to apply a measured amount of vaccuum to it to make sure that the spring inside is operating correctly. I need to get my gm engine performance book out of my box to know for sure the exact procedure.

RPM WS6

iTrader: (3)

A PCV valve is very cheap (less than $7 from the dealer). Is it really worth testing? If I ever were to suspect in the slightest that it was bad, I wouldn't even waste my time testing it....just get a new one.

Frosty

iTrader: (17)

I guess my basic question was will it/can it effect gas mileage?

Cody Brooks

iTrader: (2)

thats why i can't remember the test for it. the only times I put one on is whenever I do a tuneup on a customers vehicle and they ask for it. I had a chyrsler van that would die at stop signs because the pcv hose was kinked and putting a new pcv hose fixed that running problem.