I have a 79 ford F-150 and i was wondering where the pcv valve was my truck will start but it wont idle until its reached normal operating temp i was told that it might be my pcv valve is that correct or what else could it be. thanks
You have a classic symptom of a bad EGR valve. The EGR valve lets exhaust gas bleed back into the intake manifold. I'm not sure exactly where it's at on your model truck, but there not hard to find. They usually have a vacuum diaphragm on the top. An actual Ford shop manual should have detailed instructions on how to troubleshoot.
Could also be your choke is not working properly. Your pcv valve will not cause an idle problem . But if you need to find it , it`s attached to a hose that is on one of the rocker covers. Hey Mana ! WTF is that crap? Mule
I would not start at the PCV valve but check with your cooling system first. Check and replace the thermostat
You didn't say what type of engine but it's on the valve cover the a black hose attached to it, on a v-8 it should be on the passenger side. A PCV valve isn't expensive and it's easy to change, to check it pull it off and shake it, if it rattles it's good. It could be a bad choke if it isn't fuel injected, a common problem before fuel injection. I don't think it's a thermostat because it does warm up, I'd check the PCV valve because it so easy to check, then the choke if there is one, or the mass air sensor if it has one. I don't remember when Ford when with fuel injectors on the F series, but I'm betting on the choke. EDIT You should see a black hose going from the air filter to the valve covers, the PCV should be on the filler cap, if I remember right.
