Does the 1997 ford thunderbird have two pcv valves?
Does the 1997 ford thunderbird have two pcv valves? - 1
ONE and if it's defected: Replace it. Ford does not recommend cleaning the PCV valve. See the RED arrow and where it's pointing to.
I used the 4.6L picture since you've not said anything about the displacement of the engine. 
- Why is my 1997 Ford Thunderbird making a loud knocking noise as I? I bought a 97 ford Thunderbird not to long ago and it is starting to make a thumping like kknock. Sound like it is coming from under the car but only happens when I'm driving. I got an oil change n still hear the knocking why?
- What would cause an ignition coil to fail repeatedly on a 1997 Ford Thunderbird? The car has 65,000 miles on it and has received regular tune ups and oil changes but over the past year or so it leaves me stranded every 3 months or so leaving me to have it towed to the nearest mechanic--including the Ford Dealer once. Every time I'm told it was the ignition coil and it is replaced and the car runs fine for several weeks until the next incident.
- Why does my PCV valve have a wiring harness that attaches to it? 2004 ford taurus 3.0l flex? 2004 ford taurus 3.0l flex. I pulled the PCV valve out to clean/inspect it and it has a wiring harness attached to it. I have never seen one like this, the replacement part is confirmed identical with the same harness receiver. I have had no luck searching forums or the internet to explain their purpose or what type of sensor may inside this thing.
- 1997 ford thunderbird overheating 5.4 inline engine? My car is overheating when i go up hill then when i level out it runs normal operating temperature. Things I have replaced. -put a rebuild engine in -new thermostat and gasket 165 degree -new water pump -flush coolant -service transmission -new belt tensioner and pulley -new oem radiator fan (it is blowing the right way) -new radiator I'm not losing coolant. Have checked it for 2 weeks and have not added anything. There's no oil in coolant and no coolant in oil.