Misfire jumping cylinders

Hi everyone this site is awesome!!
I have a 2011 Tacoma 4 cylinder that is doing some strange misfiring. It started one morning when I started it up it bagan shaking and sputtering I tried driving up an incline and no go. I turned ignition off then restarted and it ran fine for a week. Threw code misfire on cylinder 2. I changed plugs. Number 2 coil and ran lots of sea foam in gas. It has happened maybe every tenth time I start truck for about 20 sec and then fine. Just today I start truck runs rough( 3 cylinders for 20)sec. corrects itself and runs fine for 10 min until all power is gone light is flashing I have to pull over runs rough for a few minutes I turn off check codes misfire cylinder 1 and 2. New code p2433. Start truck drive away runs perfectly. I’m lost compression is good all around. Any thoughts are appreciated thanks.

 

The P2433 is for the secondary air injection system.

What the P2433 code means
The P2433 diagnostic trouble code is an indication that there is a problem with the airflow/pressure sensor circuitry of the secondary air injection system.

The secondary air injection system allows fresh air into the exhaust system. The purpose of this is to reduce the amount of harmful pollutants that the exhaust emits into the environment. The secondary air injection system sends a voltage signal to the powertrain control module (PCM). This voltage signal contains information regarding the pressure and flow of the secondary air injection system.

If the voltage signal reading exceeds the specifications that have been predetermined by the manufacturer, the P2433 diagnostic trouble code will be set by the PCM and the Check Engine Light will come on.

What causes the P2433 code?

• Faulty air injection valve
• Faulty one-way check valve
• Faulty air injection pump
• Faulty pressure sensor
• Pressure sensor wiring that is frayed, broken, or shorted
• Pressure sensor connector that is damaged or corroded
• Pressure sensor connector that has bent pins
• Faulty vacuum switching valve
• Vacuum switching valve wiring that is frayed, broken, or shorted
• Vacuum switching connector that is damaged or corroded
• Vacuum switching connector that has bent pins

What are the symptoms of the P2433 code?

• Check Engine Light is on
• Secondary air injection system may be noisey
• Engine may stall when idling
• Engine may stall when starting the vehicle
• Engine may hesitate when accelerating
• P2440 diagnostic trouble code stored in the PCM

 

Thanks I’m not sure where these check valves and pressure sensors are located but I will check it out

 

So I took apart the smog pump the foam filter was intact and everything is looking good and works well. The valve seems to be in good working order and the symptoms have changed a bit the misfire on start up has stopped but now 2 times in 24 hours when I accelerate onto the highway after driving in woods for an hour with no problems the vehicle goes into limp mode and throws flashing check engine light. I turn off restart and code gone limp mode gone hit 3500 rpm limp mode returns. I restart accelerate slowly no problems the rest of drive home. Only code misfire cylander 2. Any input appreciated

 

Move the #2 coil to a different cylinder and see if the code follows

 

I did this it does not follow the coil

 

I find it strange that pulling over turning ignition off. Then immediately restarting erases engine light stops misfire and limp mode. May not occur for a week. Strange

 

Not strange at all. Your secondary air injection system is messed up as I noted above. It resets when you restart.

 

I know the pump runs when cold can feel air going through hose is there a trick to trouble shooting the secondary air system are my symptoms most likely a valve sticking open?

 

What causes the P2433 code?

• Faulty air injection valve
• Faulty one-way check valve
• Faulty air injection pump
• Faulty pressure sensor
• Pressure sensor wiring that is frayed, broken, or shorted
• Pressure sensor connector that is damaged or corroded
• Pressure sensor connector that has bent pins
• Faulty vacuum switching valve
• Vacuum switching valve wiring that is frayed, broken, or shorted
• Vacuum switching connector that is damaged or corroded
• Vacuum switching connector that has bent pins

 

I replaced the valve assembly and still misfire slow idle on start up for about 15 seconds every 5 or 6th time I start it. Time for new air pump as well I guess lol

 

Aloha guys, thanks for sharing this thread.
I'm having a very similar problem in my 2008 2.7 4 cylinder tacoma. 91k miles. Code P0301 came up when going uphill. I drive up a hill each day here on the islands. when driving up any incline the engine starts skipping then loses power. Same thing works for me, if I shut the engine off and start up the engine regains power. I Cleared the CEL and then Changed spark plug on all 4 cylinders. Then the next day P2441 came on. Replaced cylinder 1 coil. Now I'm still getting P0301. Any help here?

 

So I replaced air switching valve and smog pump but pump still not active at start up. 2011 2trfe what relay or fuse are related ?

 

Check the pressure sensor.

That code flags if the grey wire on the pressure sensor sees above 4.8 volts.

Check the brown wire to have 0 voltage.

Really need a scan tool to monitor that sensor, but can be done without.

That code is defined as a pressure sensor issue, not a pump issue necessarily. It could still potentially be a pump, but that code points at the pressure sensor itself

 

Is that the map sensor?

 

It is not. It is a sensor used to monitor the flow of the air switching valve assembly. Check your vacuum hose as well that goes to that sensor.

 

I replaced pressure sensor and So far so good thanks guys

 

Awesome to hear! Let's hope it stays fixed!

 

Has anyone confirmed that the pressure sensor was the problem and that the problem did not return? I have these P2433 mystery symptoms now on my 2009 4 cylinder. I've changed plugs, run seafoam through fuel systems to clean injectors, and chased possible bad coil(s) that apparently don't exists. I now can start cold with no problem about 50% of the time. When it does start up skipping and misfiring, I can turn the engine off, wait a few seconds, and restart with no problem. It's frustrating replacing good parts with new parts and having the problem persist. I'm on my second Tacoma since my first 1985 Tacoma. I'm retired and living off Social Security and troubleshooting by replacement really cuts into my budget.

I assume the >4.8V on the gray wire doesn't happen during times the engine is running good.
And does the brown wire supposed to have 0V, or is 0 volt a symptom of the problem?

Just trying to save a few coins. Thanks

 

Also, forgot to mention $20 worth of Throttle Body Cleaner (which looked like it was needed) and Mass Air Flow sensor cleaner. Just checked the Pressure Sensor vacuum line, no apparent cracks or leaks.
Just fired it up and it's running smooth a a baby's bottom, but it's lied to me before.