toyota Prius misfire P0301

[@Majorleage]

One of the more educational videos due to showing how to block off egr system and diagnose the fault to a isolated system. Very smart and wonderful trouble shooting tactics 👌

[@CoolAirVw]

thanks!

[@napynap]

I've had this exact problem for months (same rattle sound!) on my 2010 Prius w/ 200K miles. I've changed the spark plugs and ALL of the coils, and also the Crankshaft sensor, but the problem is the same. I'm pretty sure after watching this video and others that I have an EGR problem like this. Thank you for the research and posting this!

[@CoolAirVw]

thanks for watching. Glad it helped.

[@calvaryassemblyofgodsouthi8046]

So did you resolve problem? I just cleaned my whole EGR SYSTEM today and rattling persists. Have a blown head gasket 2010 Prius 200k miles

[@CoolAirVw]

@@calvaryassemblyofgodsouthi8046 I dont know about napynap's car but it fixed the one in the video, just saw the car yesterday. Running great. Any misfire will cause the rattling sensation. Head gasket is common and will cause misfire as wet cylinder affects spark.

[@our5Tube]

This video went through ignition test, EGR valve cleaning, EGR cooler cleaning, and last manifold cleaning, eventually getting the problem solved. I believe I got idea how to solve my Prius engine shaking problem. Thanks!

[@CoolAirVw]

your welcome

[@raduspataru529]

Thanks a lot. Very useful video for me. It solved the problem for my 2012 Prius(120k km). I started in reverse with intake ports and rattle is gone. Thak you again.

[@CoolAirVw]

So glad it helped! I have to point out that any misfire will make the rattle noise. So spark plugs, injectors, coils, head gasket, compression as well as EGR problems and other things will make this problem and cleaning the EGR wont fix any of the other things.

[@stoneblue1795]

Well done, friend. I found your determination pretty refreshing, vs. throwing part$ at the little beast, you simply fixed it. That's cool.

[@CoolAirVw]

Just talked with the driver of this vehicle yesterday, trying to guilt trip her into getting me a coke, but she threatened to bring a DIET coke. AM I that fat? Anyway, the car is doing great!

[@konjomamush8834]

You are professional mechanic good job I learned a lot thank you🙏👁

[@CoolAirVw]

thanks!

[@morrislopez9905]

WOW thanks for the idea definitely checking this. 😊😊

[@EXOVCDS]

Good to know that a good cleaning is all that's needed!

[@CoolAirVw]

Carbon service every 180k whether it needs it or not.

[@pyronitro]

Good Job! i never tried using a wire in the intake. i'll do that next time.... i have 3 prius (prii ?) in my stable, and that is the sound of a headgasket replacement soon if the EGR isnt cleaned (and the intake also). long term fix is to change the piston rings to standard not energy saving plus a oil catch can. it will lessen the oil in the intake which clogs the EGR. similar to the TDI. if EGR isnt cleaned, all this knocking (from liquid in the combustion chamber) stretches the head bolts which results in a headgasket repair. but even that is temporary (20k -50k mi) until you do what i mentioned above. Replacing the piston rings is easy as the engine is like the brakes. its not even worn at 300k mi. hope i make sense.

[@CoolAirVw]

Great input! Thanks! Where did you get so much Prius knowledge?

[@pyronitro]

@@CoolAirVw priuschat forums. when i first got the prius. the oil usage was insane. after a year of adding oil and intermittent P0420s and a 2nd Prius doing the same. had to fix it. i tried everything to clean the rings thats available. nothing works except changing it. i tried just changing the oil ring itself on one using aftermarket standard. and that lessened the oil consumption but didnt eliminate it. dont bother with the OEM rings. ... most of the time it makes that sound on a cold morning due to condensation. causing it to have liquid its tryng to compress inside aside from the ever present oil in the intake. which is why you need a oil catch can. it also catches some of the condensate. but you dont have to believe me. maybe you can test and make a video on that. :) oh and like the vw having vcds. its best to have techstream for toyotas to see the actual codes.

[@quacktony]

I did a takedown of the intake system and it was clearly needing a cleaning. The egr ports inside the intake runners def needed a cleaning. I'll be taking apart the egr valve and cooler to clean as well. Been using simple green to clean the engine because I don't want brake cleaner to destroy the rubber hoses in the engine bay.

[@CoolAirVw]

thanks for watching

[@NaturalZBey]

Plenty help, thank you 👌🏽

[@CoolAirVw]

your welcome

[@35450gwen]

thanks a lot .i check for my ct200h

[@CoolAirVw]

thanks for watching.

[@cd7856]

2010 Prius with 230k miles. Sometimes after leaving the car in the rain and only after leaving it in the rain, the car makes a similar knocking sound for about 3 seconds. Then it stops and everything is normal. No error lights on the dashboard… has probably happened 10 or 20 times over 10 years… Then yesterday it made the knocking sound and the fine light came on. The code is P0301. What about the rain could be causing the knocking? Is there a specific part that I should investigate for failure?

[@CoolAirVw]

change coils and plugs and hope.

[@Soccers242424]

Hey, what did you use to lubricate the egr valve, I believe mine is stuck open? Thanks for the video

[@CoolAirVw]

I didn't lube it.

[@shamskl3245]

you can use break cleaner or EGR valve cleaner

[@CoolAirVw]

@@shamskl3245 Neither of those is a very good lubricant.

[@Buff_Dave_Oprtr]

Great Video! My daughter has a 2006 Prius. Very bad "knock" sound at idle. Loss of power,and,check engine light. OBDll scanner showed misfires on cylinders,1,3,and 4. Knock goes away in drive and reverse. Only while in park. Changed plugs,cleaned MAF sensor,and,intake. I believe the "EGR pipe" is internal,or, software driven on gen 2s. Maybe,the igniters or injectors? There was also a 4th code shown. "po446". ANY help would be very appreciated. I'd hate to think motor is shot.

[@HummerClubTV]

2006 prius without EGR.

[@CoolAirVw]

did you solve this problem?

[@Buff_Dave_Oprtr]

@@CoolAirVw Unfortunately no. Car is gone.

[@Fit4FreedomLLC]

That's alot of down time and work for my daily driver, I got just over 200k and started getting the same problem, I diagnosed by unplugging the EGR and misfire went away, I plan to just block it off. My car did not throw any codes until I unplugged the EGR

[@CoolAirVw]

thanks for watching my channel

[@calvaryassemblyofgodsouthi8046]

Check for coolant in the oil. Will look like mayonnaise or milky. Blown head gasket on mine

[@douglasnolan4858]

Wouldn't you want to change the PCV valve as well?

[@CoolAirVw]

Did you watch the video? It clearly fixed the problem. Car is still on the road, I mentioned it was a friends car. They still getting down the road, with no new pcv valve. But maybe I'll call them and tell them to get one. Are you noticing a high failure rate at 180k plus on the pcv valve?

[@douglasnolan4858]

Just thought it would say be a point of carbon buildup as well as the egr

[@douglasnolan4858]

Thanks for the helpful video

[@CoolAirVw]

@@douglasnolan4858 Ok.

[@CoolAirVw]

you are welcome

[@joeczubernat6119]

How did you clean the valve?

[@CoolAirVw]

Mechanically. (Scraping and maybe some wire wheels on a drill)

[@jamest163]

any updates after 4 months on this prius? my 2013 prius show same symptoms as yours. im going to work on mine in tomorrow.

[@CoolAirVw]

Car is running great. Misfire fixed. Make sure you address this as a misfire and not as just needing EGR cleaned. Although it probably needs EGR cleaned if it has similar mileage.

[@jamest163]

my prius has 200,000 miles, same exactly symptom that you show on video. hopefully it is the EGR, and i saw on another video po301 on prius gen3 can be blown head gasket.

[@CoolAirVw]

@@jamest163 Lots of stuff can cause misfire. coils, spark plugs, yes, head gasket

[@jamest163]

i just spent whole day to clean EGR and changing spark plugs, after changing both of them, i have been testing 4-5 times to start the car. no more knocking and shaking. just waiting for early morning to get some pink coolant from dealership. thanks for replying!

[@CoolAirVw]

Read my update on JP stone's comment above. Its doing great.

[@JoseGarcia-px9xj]

when you assembly the egr valve it does no mater the position of the move part on the screw

[@CoolAirVw]

I dont understand. Sorry its been months since I've seen this prius.

[@amaljinadasa6695]

did flash check engine light or not

[@CoolAirVw]

yes

[@awaisateeq]

My Prius doing same with engine light flashing this trick will work for me too?

[@SalemAbuOmar]

great work but the easiest way to clean it pressurized diesel fuel spray in all that's junk

[@CoolAirVw]

good tip.

[@iankelly2110]

well that was a change from the normal.

[@CoolAirVw]

It was fun.

[@johnmwangi6291]

What's the position sensor for if it can't flag a position sensor code 🤔🤔🤔

[@CoolAirVw]

Yeah!

[@zero2three1]

Hasn't been too long but are there any updates on this Prius?

[@CoolAirVw]

the prius is fixed and still motivating down the road.

[@zero2three1]

@@CoolAirVw Thank you. I'm waiting for the intake manifold gasket to arrive to start the project.

[@CoolAirVw]

@@zero2three1 Is yours doing the same thing?

[@zero2three1]

@@CoolAirVw Cold start rattle in the morning occasionally. Had and cleared a P0301 last week. Fluids are OK. Spent a lot of time researching. The car drives fine for the most part but...

[@CoolAirVw]

read update on jp stone's comment above. Its doing great!

[@brandondelahoussaye299]

Never explained if it fixed the problem or not

[@CoolAirVw]

The video shows a fixed car I believe. Cleaning egr components fixed it.

[@Tuck_Frump]

Did the head gasket fail yet like all gen 3 prius's do? Or did the owner traded the car for an EV?

[@CoolAirVw]

Not yet. Same folks still driving it. Still been very reliable.