Engine idle too high.

You should look at replacing your suction control valve.

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.

the easiest way to find out the answer is to go to Something like
www.eurocarparts.com

put in your reg No or model & Look up timing chains/belts

The first thing is to have the computer scanned for codes. the check engine light should also be on with the engine idle too high.Scanning for codes is the best first step in finding the problem.
this could be caused by a vacuum leak or bad throtle postion sensor or mass air flow sensor and more.Go to an auto zone or other auto parts store ,they will scan the codes and give you a print out of the codes. get me the codes and i will try to help you solve this problem.

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.

first check for a vacuum leak.....

Two things I would check. first I would pull the Idle air control motor off and clean it and make sure it is working properly put lube on it i necessary. Next would be the engine coolant sensor. But I think the first will take care of your problem The IAC motor is mounted on the throttle body.

This could be caused by dirty or over-aged power steering fluid, it's not flowing enough when the engine is cold (so the fluid) lack of enough fluid flowing through power steering pump can cause the power steering pump to start whining. Change the fluid and you should be good. Hope it helps and please don't forget to rate the answer if it was helpful, it helps me, thanks!

Try cleaning your engine with an engine flush such as AMSOIL engine flush and then draining your oil once the flush is complete. It will clean the interior of the engine and drain out the contaminants. Once this has been perfomed replace the old oil with completely synthetic AMSOIL or Mobil 1. These oils are know for there ability to clean an engine and to reduce the chances of sludge formation in toyota engines. This is a good place to start before you go spending thousands on a new engine!!

Put key in ignition. Hold down one of the key buttons and hold it down while you turn the ignition on. Door locks should pop up and down. Then release button and remove key.