Engine misfiring, jerking when accelerating - No Codes
Racer
Joined: Mar 2011
Posts: 1,817
Likes: 229
From: wa
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.
Racer
Joined: Mar 2011
Posts: 1,817
Likes: 229
From: wa
CL Community Team
Joined: Apr 2001
Posts: 16,560
Likes: 1,385
From: Austin, TX
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
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
Lexus Test Driver
Joined: Apr 2008
Posts: 1,058
Likes: 126
From: Illinois
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.
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.
Intermediate
Joined: Feb 2018
Posts: 339
Likes: 59
From: Illinois
Replaced coils, plugs, filters, pvc valve, cleaned MAF and IAC units. All vacumn lines are connected, no leaks found. Engine idles fine, but when you accelerate the engine jerks and seems to misfire. Slow steady application of the throttle, then engine does better. No check engine indicator activity and no codes. Any ideas?
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.
Racer
Joined: Oct 2009
Posts: 1,298
Likes: 324
From: nj
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Thread Starter
Driver School Candidate
Joined: Aug 2018
Posts: 14
Likes: 0
From: Illinois
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.
Lexus Test Driver
Joined: Apr 2008
Posts: 1,058
Likes: 126
From: Illinois
Advanced
Joined: Nov 2010
Posts: 511
Likes: 27
From: NSW
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.
Last edited by Australian; Feb 19, 2019 at 03:13 AM.
CL Community Team
Joined: Apr 2001
Posts: 16,560
Likes: 1,385
From: Austin, TX
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.
Only OEM plugs for RX please.
Salim
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