salimshah

After confirming with obdII that there are no codes, if you get hesitation/lack-of-power, investigate fuel delivery and proper operation of injectors.

Salim

Jonwrench

ukrkoz

Look, it won't cost you much labor and no money to take VVT solenoids and strainer filters out and spray clean them. For the year, it should be done anyway. See what happens. It's like 20 min per set, you have 2 of them in each engine head. Right next to each other. Just be very careful with strainers, their base is made out of some brittle plastic that crumbles easily after years of heat.

ukrkoz

https://www.clublexus.com/forums/rx-...ement-diy.html

just in case

salimshah

Desperation makes us think illogically.
OCV issues should trigger check engine light.
No spark should trigger CEL.
Wrong timing of spark should trigger CEL.
Unburnt fuel exiting the exhaust would also trigger a CEL.

When a misfire is happening without CEL, the logical conclusion is there is no fuel in the chamber.

So I suggest, check that the injectors are getting triggered and there is fuel coming in. Then trace it all the way back to the fuel pump in the tank as needed.

Granted there are times when you need to leave the logic, but one must follow logic to start with.

Salim

Nad1370

Before you throw more parts on it, please check fuel delivery.
It is very likely you have a low volume fuel delivery/pressure.
Possibly a weak fuel pump or a clogged Fuel Suction Filter - (fuel pump filter) sock as i call it.
Fuel pressure should be 44 − 50 psi at idle.

Audiqv8

"Slow steady application of the throttle, then engine does better" Sound like a fuel problem. You need to get a code reader which can display live data otherwise you are just guessing. You need to see the STFT (short term fuel trim) to see if the ECU is adding or taking away fuel. You need to read the engine coolant temperature to determine if the engine is running at the proper temperature. If the ECU thinks that the engine is cold it will give it a rich mixture (more gas) to compensate. You need to see the MAF (mass air flow) see to how much air is entering the throttle. You need to read the engine vacuum to determine if there is a vacuum leak (it should hold steady at idle).

The job of the MAF is to determine the amount of air entering the throttle body. It does this but heating a wire, the ECU determines the amount of current needed to maintain the temperature of the wire. As more airflow over the wire more current is needed to main the temperature. You can see in my photo when I snapped the throttle at 61 g/s.

maxSteel

My car had low speed hesitation during acceleration for a week before the OCV code was thrown.
Could the poster be describing that as "misfiring and jerking"?

Jonwrench

Installed fuel pump, filter, regulator and strainer assembly. The problem is resolved; runs strong and smooth through all rpm ranges. Transmission shifts well. Thanks everyone for all your help with this.

Nad1370

Australian

Actually I am going to do mine I have pulled my engine down changed my plugs coils and knock sensors three times now. I am not getting too many misfires but still getting them. I know air fuel mix didnt feel right and bursts of power after lag. I even have the hollow point spark plugs now lambo style to get some bloody spark.

salimshah

Read my post #20.
Only OEM plugs for RX please.

Salim