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Old 07-28-2011, 08:29 AM
howudoin7445 howudoin7445 is offline
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Default 99 p0340 help!

I was on my way running some errands today, and then all of the sudden I look at my instrument panel and my oil pressure gauge was at 0. Then i begin to lose power and the check engine light comes on. Shortly after i stall out. When i got towed home I ran my OBD II and came back with Camshaft position sensor circuit malfunction- P0340. Location of sensor? Anything else that could be causing it? Any input would be greatly appreciated!
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Old 07-28-2011, 08:35 AM
03RangerFX4 03RangerFX4 is offline
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Default Re: 99 p0340 help!

Oil pump maybe.
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Old 07-28-2011, 09:16 AM
Fordzilla80 Fordzilla80 is offline
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Default 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.
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Old 07-30-2011, 02:56 PM
howudoin7445 howudoin7445 is offline
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Default Re: 99 p0340 help!

if thats the case, then what caused it to stall?
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Old 07-30-2011, 06:16 PM
Fordzilla80 Fordzilla80 is offline
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Default Re: 99 p0340 help!

Quote:
Originally Posted by howudoin7445 View Post
if thats the case, then what caused it to stall?
Loss of oil pressure. Metal to metal creates friction, which in turn can stall the engine. Or, no input from the CPS can cause the engine to run rough, and under load easily stall. Could be plenty of things. The important thing you need to do is to check your CPS and the Cam Sync.
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Old 07-30-2011, 08:35 PM
knucklehead292 knucklehead292 is offline
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Default Re: 99 p0340 help!

the cam sync may have gone out. and that is the sync that pumps the oil. which explains the oil gauge and stall.
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Old 08-01-2011, 03:46 PM
rking4500 rking4500 is offline
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Default Re: 99 p0340 help!

Cam position sensor is exactly this. Had it happen to me .It is located on the back of the engine block. 50.00 or so for the part.
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