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Modern vehicles do not have an idle adjustment. However there are a few common things that can affect this. First, if check engine light on, you must verify any codes. These can point directly (or indirectly) to drivability problems. If there are codes refer to Toyota factory procedure to read an interpret. Or have someone qualified to extract OBD2 info with scanner. If certain no codes then often times build up on IAC (Idle Air Control) motor and/or injectors can affect idle performance and be a good start. Vacuum leaks can affect idle too, but these usually set a code...but not always. However other engine controls can influence it too. A MAF (mass air flow) sensor can be dirty or faulty and occasionally set no code in PCM. Otherwise have a professional drivability specialist monitor all sensor data to make a proper diagnosis.
Hi, Are you looking for ignition timing or valve timing marks? The ignition timing is set at 10 degrees BTC. the marks are at the front of the engine and the degrees are scaled onto a raised molding on the plastic timing belt cover. There is a line marked on the pulley. Paint with correcting fluid the 10 degree mark and the pulley mark. Correct timing is 10 degrees BTC. Before setting, open the diagnostic connector in the engine compartment and using a short piece of electrical wire and bridge between "T" and 'E' If this is not done the timing will not be corrected. If you've replaced the timing belt and you're looking for the timing marks, the mark for the crank shaft is a raised casting forming a small pointer for the crank shaft which aligns with a groove in the crank timing gear....When looking from above at the relevant section of the engine, it will appear on your right hand side just above the crankshaft timing gear. The marks for the cams are holes drilled through each and these should be aligned with punch marks on the cylinder head. The best way of doing this job is by using a mirror and illuminating between the cam gears and the cylinder head. Hope this helps Regards Johngee10
Change the cam to one with a more aggressive profile, install a performance hi flow air intake system, hi flow mufflers and a set of exhaust headers, u will have to install hi flow fuel injectors and a re-program of the computer to take advantage of the above modifications. If u really want to go all out a Turbocharger would be the ticket, but that would cost $1000's