Jerking

How many miles? Any other problems or issues prior to the "jerking"?

 

When you cleaned the intake manifold and egr pipe, how much carbon buildup was there? Clean the throttle body and MAF sensor? Change the pcv valve? Any oil consumption?

 

Can you elaborate on the "jerking"? what does that behavior do?

 

Unfortunate. The pcv is right there with the intake manifold off. If you try to access it from underneath it's a tight squeeze. There is a video of how to do it though. Changed the tag fluid as well as the inverter coolant?

 

There aren't that many things that can make a Prius jerk. usually it would be related to a transmission problem or air fuel mixture problem. But I would check the following areas

1. spark plugs to make sure it's the correct Denso plugs and the gap is correct
2. make sure MAF sensor is working properly and air filter is clean
3. air fuel/oxygen sensor/catalytic converter might have a problem

Since the Prius has a CVT transaxle, I don't see this ever being jerky, there's no shifting gears

 

Is it more of a "pulse" ? I have noticed ..something ........with our 2011 w/150 at the 15-20mph mark .. it then goes away at higher speeds. It's most noticeable under light throttle as you pass the 15mph mark.

 

When the intake manifold was taken out and cleaned did u noticed the small holes at the bottom of the 4 big intakes holes ??? Did u cleared them too all the way thru???

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Some other questions about other maintenance you have done. Have you changed the atf fluid? What about further back in the intake, namely the egr pipe, egr valve, egr cooler: ever touch them or clean them? What about transition between the engines: any hesitation or rough transition? How much carbon depositing had you seen initially, and how many miles ago was your initial intake cleaning?

Some others have posted video for audio of the issue. If you can do that safely, that may help with additional troubleshooting or diagnosis.

 

Thanks for the pics . Based on the deposits found and what looks to be clogging in the egr manifold ports which is restricting air flow. These are the small holes on the lower side of the intake manifold.

What cleaning did you do to the intake manifold? Did you rod the ports out, then do a flow test to confirm the ports are clear? While the intake manifold was off, did you change the pcv valve? Clean throttle body?

 

Based on the level of carbon deposits found in the egr pipe to the intake manifold, I also suspect the egr valve and cooler will have carbon deposits.

Of course cleaning these are more involved . I have cleaned all the way from the egr cooler through the intake manifold. The cooler and egr valve took me and my old man 8 hours to do both ( I feel this is a two person operation--> 1 underneath the car and 1 above). I also planned ahead and got spare egr valve and egr cooler to ensure I had a clean system.

 

Glad to hear it worked out for you.

Keep in the back of your mind about the egr and egr cooler. Those deposits are still there if they have not been attended to and can cause the same air restricted behavior. But that's a battle for another day.

Keep driving and enjoying your Prius!

 

Hi there! I'm having the same issues with my Prius as you describe in the beginning of the post... did cleaning those intake holes out fix it indefinitely? I had an auto shop tell me it my head gasket ($75 part and $2400 labor), but I don't seem to have the symptoms of a cracked or blown head gasket. I'm hoping I just hit the jackpot in this thread!