Cylinder 1 misfire and other codes

Like many other members posted here....look for that....and you mentioned seafoam addative.....there could be water and contamination reached your injector

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Don't ever trust pre-gapped statement.....i have worked for many years like mechanic and this is one easy overlooked mistake....and i have found a lot of wrong gap on them

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Take look cylinder that misfire and measure gap......and connector to coil and boot to spark plug.....make sure that you have used properly torqued spark plugs

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Error code getting on O2 sensor is not what you should look first if you have misfire....eliminate first misfire

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With spark plug gap .....they are not expensive.....

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This may have been true in the good old days, but if the correct plugs have been purchased the gap will be correct. Doubly so if iridium plugs (recommend OEM Denso or NGK) were purchased do not even attempt to slide a feeler gauge in the gap. You will damage the iridium tip.

Your focus should be on why cylinder 1 is misfiring. It can only be the coil (connectors, wiring, etc), the injector (connector, wiring) or the signal from the ECM to fire the spark or the injector. Eliminate the components that are working, which should leave the bit that is broken.

 

I will disagree about spark plugs gap.....and i do this for living....
But don't wanna start off topic...
My experience and time i spent in petrol and electric engines ....
And Iridium spark plugs can be adjusted with proper tool's
So for the member that have problems please don't hesitate to ask questions we are here to help

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There's a chain store called Harbor Freight that sells torque wrenches and all other automotive tools at ridiculously low prices. Not the highest quality, but there's no excuse for not having the right tool with the prices they have. I think you can pick up a 3/8" AND and 1/2" torque wrench for $40 for both. Just be sure to return it to its low setting each time you use it.

Second, the Haynes manual is for the Gen II. It won't help you much. The NutzAboutBolts videos will help you much more; they're in the Sticky area of this board.

If you're having a cylinder one misfire that's repeatable, try swapping components with cylinder two and see if the problem follows the component. Try the fuel injector, and separately the ignition coil with wire.

I'm still suspicious about battery voltage. Measure it in the morning, when your car is cold, and measure it up front, from the jump points, not the battery terminals. I also have a 2012 and our batteries are reaching the point of replacement. As soon as I have any issue, that 12V is getting swapped.

 

I was just typing exactly the above reply when Rebound beat me to it.

 

Hey Matt, my name is Ethan, I am having the exact same problem as you with my 2010 prius, that has only 48k miles. Left the lights on, got a jump start and immediately noticed a misfire/knock in motor. That was about a month ago. Since then, I have taken it to 4 shops and spent about $700 on this issue so far. I have replaced the 12v battery, cleared all codes with techstream at dealer, cleaned intake manifold, cleaned throttle body, cleaned egr pipe. Ecm tested fine. Dealer says they think its a blown head gasket which makes no sense and it will cost between 3-6 grand to fix. If you get to the bottom of this issue, PLEASE POST ON HERE SO I CAN REMEDY MY CAR AS WELL AND I WILL DO THE SAME.

 

Welcome to Prius Chat!

Did they give you any background on why they think it is a head gasket? Is your coolant low? What does the oil look like and smell like? Is there any white smoke coming out of your tailpipe?

Are you the original owner? If not, how long have you owned your Prius? When they cleaned all the intake plumbing, what did they find? Are the same codes @mattdhurley12 has the same ones you have? If not, what codes were thrown? Have they tried moving the components from one cylinder to another like @Rebound said? Does it follow the problem component?

Keep us posted

 

They said there was some coolant in the throttle body which is why they think its a head gasket issue. From leaving my lights on? Oil is normal with no coolant in it. I am right at the time for an oil change. No smoke from pipe. I am fourth owner. I have owned this car for about 10 months and have put 20k miles on it with no other issues except the hv battery being replaced under warranty 7 months ago. My buddy/mechanic and I cleaned that stuff because dealer refused to unless I agreed to have head gasket replaced. It was very dirty, throttle body creamy in consistency, egr pipe was caked in carbon, we did a very thourough cleaning and drove it 40 miles, then looked back inside throttle body and found it to be spotless. Nothing else leaked in there... I did have the same codes as Matt. We haven't moved the components yet...

 

I believe there are coolant lines that run through the throttle body. Could your throttle body housing be internally compromised? Ever have anything hit the front end? 4 owners with 48 k miles is an awful lot of owners with very little miles IMO. Any idea why so many owners? Salvage title?

Sounds like you have the ability to DIY. Down south I am sure there is a salvage yard to 2. If the oil does not smell like it has coolant at the dipstick or it doesn't appear to be the consistency of a milk shake, you might want to look at the throttle body as the source. How much coolant was the engine side low, or to say how much did they add?

Step I would do first though is swap the components of cylinder 1 to another cylinder and see if it follows to that cylinder. If not and still at cylinder #1 with different components, I would look closely at the throttle body as sucking some coolant mix would cause improper ignition and misfire. If it is the throttle body, I would find a salvage yard for the replacement as new they are pricey and no different than a used throttle body from a rear end hit.

Keep us posted .

 

I guess I also should have asked why the HV battery was replaced under warranty? And there might be something to this as the 12v, HV battery and now an engine misfire is an awful lot for 48 k miles. You may be dealing with separate issues and it was coincidental that the 12v went and the coolant was found in the throttle body.