Why is my Toyota quantum 2.7 vvti stalls for power and suddenly gains power randomly. I've changed all the sensor's and the vvti unit. Please help.

lost your scan tool???
buy ,rent or barrow one
or many shops do it for free.
ask.
hint, modern car engines can not be diagnosed lacking scan tool
scan it and look first
guessing risks adding bad or wrong parts to cause 2 problems. now.

has only one , located on center of engine block

Might be a fuel problem. Low fuel pressure the best thing to do is take to your local mechanic to have things checked. It can take some time to figure out

Check the valve clearances . They may need adjustment. Do a compression test to find the condition of the piston rings. Check the cam to crank timing. It may have slipped a tooth on the chain.

My Toyota Quantum 2.7GL idles but does not rev up. i ve ...

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-What do you try to tight...?
-Always follow its repair manual.

Good Luck

Mai Lor

Maybe this AUGOCOM Engine Timing Tool can help you.

We do not have this model in US, but I assume it is a new model 2016-17. You throttle (and the "rev" ) is controlled by the computer. The fact that your car is idles - should mean that your computer is fine! There are two types of idle control: 1st- when you have a bypass of the throttle, which lets the throttle flop stay close while idling and let's the air into the motor through a bypass and electronically controlled idle switch. Inspect your throttle - the electronic/metal unit located on the large pipe through which the air gets into the motor: if you have a "bypass" for the air then you need to inspect your throttle body as it could be your problem.
2. most likely you do not have a bypass and your idle is controlled by your throttle body, then it is sure working fine and your only issue is that your engine computer does not know that you press the accelerator. Your gas pedal has an electrical unit on it which connects to the engine computer- inspect the connector/wires if all looks fine most likely your accelerator sensor does not work- you need to change the gas pedal unit ( I think it called accelerator sensor).
Good luck.

how to set the timing marks on the timing sprockets on a vvti quntum