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Hello, do you mean you replaced the oxygen sensors? How many miles are on the truck?? How does it run while driving? Just a poor idle? No warning lights on? ANy diagnostic trouble codes stored?
Ok you replaced the VCT solenoids? Or the camshaft position sensors? What were the code numbers?
Is the check engine light on now? DId you remove the valve covers to replace these sensors, or pop them off the front of the timing cover on the front of the engine on both sides?
Ok but that was a year ago. So with the light on now, the first thing that needs to be done is a check for what codes are stored now. Most auto parts stores will check for codes for free. If it has to do with cam position, either P0340, P0012, or P0022 it is most likely to do with either the Variable cam timing solenoids or camshaft phasers. So you need to pull codes first. Assumign there is no vacuum leaks, this could cause a poor idle and noise.
You are welcome, If it sets these codes, the first thing to do would be to remove the valve covers ( to gain access for the vct solenoid) and inspect the internal engine condition. If it is heavily sludged up/not maintained well this can be a bigger problem. the VCT cam phaser setup is operated off of engine oil pressure. So if there is a restriction, it will affect its performance. Also as you get into this mileage range, the timing chain can start to stretch or the chain guides can break. Worse cse scenario is an engine replacement, due to a lack of oil pressure. Major is timing chains, guides, tensioners and phasers, minor is the vct solenoids which would be the first route to replace if the engine looks clean. If you need more help let me know. If I was helpful, please leave a positive rating.