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It could be caused by the oil control valve, it's located on the side of the cylinder head, the vvti actuator is the gear on the front of the camshaft, if it was replaced try replacing the VVTi oil control valve. It can also be caused by a worn chain tensioner.
best advice is to get a workshop manual for the engine
next
heads can generally be removed in car
next set the valve timing before removing the belt. check and record the position of the cam timing marks
don't move the crank after the head is pulled
I found this on a google search i hope it will help you as the engine is the same QUESTION: , 2001 Avalon 145,000 miles. Recently developed rough idle when warm. Today produced codes of P1150, P1354. It points to the VVT system. Can a DIY diagnose and repair from home?
Thanks, John
ANSWER: The P1354 code is for the VVTi malfunction on bank2 which is the cylinder head near the firewall, the 1150 code is for the air.fuel ratio sensor on the same head, the VVTi code can cause the A/F ratio sensor to go out of range, the main cause is the P1354 code which should be delt with first, this can be caused by a worn timing belt that has junped a tooth on the sprocket, this should be checked first, at this mileage if it has never been replaced it may be the problem. If your scanner can read live data see where the engine timing is at. If the timing is not the problem it may be a bad oil control valve for the VVTi system, to be sure it should be active tested using a diagnostic tool that is capable of doing so, activating the system at idle should cause the engine run rough at idle, if there is no effect on the engine the VVTi is not activated and the problem may be the OCV.
OCV is the oil control valve for the VVTi system, it's located on the side of the cylinder head at the front and has an electrical connector on it, the valve may the problem but it cou;ld also be a clogged oil passage that supplies regulating pressure to the valve or the VVTi gear, the system operation can be checked by connecting an intelligent tester that can activate the system to verify if the valve is the problem, before replacing expensive parts I would make sure what the problem actually may be.
it has disks and you have to pull the rocker covers and mesure each valve and find the clearance with valve closed then you have to buy the disk s you need to set it to the right clearance.
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