Re: 99 p0340 help!
Ohhh boy, this may get costly.
It sounds like your Cam sync failed. The cam sync drives the oil pump, and when the cam sync fails, it no longer turns the oil pump, hence the drop in oil pressure. What basically happens is the small shaft inside the cam sync rides on a set of bearings. Well when these bearings start to fail, the cam sync sometimes exhibits a chirping sound. After a while, or sometimes immediately, the cam sync inner shaft will begin to wobble. There is a Camshaft Position Sensor mounted directly above the cam sync that counts how many times the inner shaft revolves. Well, when the shaft starts to wobble, the shaft will sometimes lift up, and when that happens the tooth at the top of the shaft catches into the plastic of the Cam Position Sensor. Sometimes the tooth will tear the sensor to shreds. Other times, in the worst case scenario, the tooth catches and abruptly stops. This is when you lose oil pressure since the inner shaft is no longer revolving, or turning the oil pump. If you shut it off immediately, then you may be okay. However, the camshaft spins with the cam sync inner shaft, so there may be damage there too if the shaft just abruptly stopped.
Another event that happens with the cam sync is when the nylon gear at the bottom of the shaft shears off. The gear is no longer able to spin the oil pump, which results in a loss of oil pressure. To diagnose this, the cam sync itself will need to be removed and inspected.
Last edited by Fordzilla80; 07-28-2011 at 09:24 AM.