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I have a 06 prius with 238k on it. 't have any story on it

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I have a 06 prius...
I have a 06 prius with 238k on it. don't have any history on it though. Loud knocking present mostly with any load. very poor mileage (tankful = 158 miles), very low power and occasional stumbling. replaced all plugs, (used set of coil packs too), all fuel injectors + 2 tankfuls of gas (in case a bad batch). Noise remains. Questions: have not checked vv. filter... worth a shot? did oil change, cleaned TB and intake (little oil under TB) and did oil change + trans fluid change. when I use tech stream i see occasional misfire on 1, and for ever 20 on 1 I get one on 3. NO LIGHT. when i got it, had not been reset for thousands of miles and no light also. when i data stream i see a lot of -5 ign timing as well as no movement other than 4/-4 on knock sensor. last - i get nothing on the 4 data points on VVT - other than just ON for vv. status..... what am i missing? is it rod knock/piston slap. oil consumption is not an issue as of now... Thanks - D
Submitted: 2 years ago.Category: Toyota
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Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 39 minutes by:
9/12/2015
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago
Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 4,986
Experience: 30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
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Hello. Welcome to Just Answer. Please allow me to assist you/

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Customer reply replied 2 years ago
sorry. not a good time for phone call. can we do via message
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

Ok. Let's do this. Start the car and get it to knock by having someone press the accelerator. You disconnect the wire connector at the coil pack one at a time. When the knock noise changes, thsi will verify that the issue is rod noise/Piston slap, etc. it really sounds like you have a crank./bearing issue here. A V v t issue would set the MIL

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Customer reply replied 2 years ago
sounds good. I will get some help and get it done and let you know what I find. send you something back in 1hr or less... any need for inspection mode?
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

No. This is old style mechanic diagnosis. Old trick

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Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

WHen you take away the spark, the rods are not forced downward as hard. This is how you check them

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Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

You can have all 4 rod bearings completely shot and it will not show up on a scan

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Customer reply replied 2 years ago
Ok. Got it. Thx. Will keep u posted
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

Ok Thansk

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Customer reply replied 2 years ago
Okay I pulled each coil one at a time... the engine was idling and charging, was knocking good. Every plug disconnect had a nearly exactly the same effect. Knock remained, engine stumbled very hard and then eventually stalled. One thing. Restated and for some reason Ice was running but not charging.... dead silent. Floored the gas and Rpm climes to what sounded like 2.5k and pulsed up and down a but like an a/c engaging on and off (know not belt driven on this car).... but the engine was quiet, like normal. Any crank issue I ever had would have rattled at freespin. In sounds more and more like its in the top end. .... what next???
Customer reply replied 2 years ago
Can I send u video???
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

yes

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Customer reply replied 2 years ago
Having issues sending video
Customer reply replied 2 years ago
here is a video. I was in a drive through lane... so echo is good. car starts with charging, you hear the banging. I then throw it to neutral, you can still hear the engine running for a few, with no noise... then engine goes off.... let me know...
Customer reply replied 2 years ago
here is a better video of the car idling... no press on gas, car is just charging pack in park. noise really sounds like top end.... what do i do next? seams to get worse vs. when its cold engine... when warm it seams louder... if i accelerate hard enough, like over 4.5k rpm i cannot hear it as much....
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

Can you do another video from under the hood?

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Customer reply replied 2 years ago
first video is the car in park, no gas pedal. just idle and charging pack.
second video is in drive, power braking and floor gas - charging pack
third video is a quick start/stop with no charge. just in park and floor gas for a minute
fourth video is flooring gas, not charging
Customer reply replied 2 years ago
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Customer reply replied 2 years ago
any ideas?
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

Let's pull the cam cover off. This sounds like you either have no oil pressure to the cams or the water pump has failed.

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Customer reply replied 2 years ago
Ok. That will take me a day to do. I'll get back with you when I have it off....
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

Ok. I will be online on and off all weekend.

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Customer reply replied 2 years ago
Ok. My question is though if it was the water pump as I've read on a lot of forums that water pumps can often sound like this wouldn't it sound like that regardless of engine load for charging? Another question I have is that if there was an oil in the shoe I would expect it to have the noise at idle no matter what charging state it was... so the only conclusion I can think of is that its timing related in the ignition timing or in the valve timing... I guess what I'm asking is could this kind of knocking be so strong if it was carbon buildup on pistons? I know this is easy team is supposed to throw a check engine light but is it possible that the knock sensor or other sensor may have failed but still be providing a reading that the ECU does not determine to be outside of parameters and therefore won't turn the light on.... I'm really not sure this car is making me scratch my head... I'll follow your advice and pull the cover to check for any obvious issues and also I can check the chain while I have it off... at the same time I'm going to inspect the spark plugs again it would be my luck that I got one spark plug but the cracked insulator or some other form of damage :)
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

Carbon knock would be rare on this engine. It uses the Atkinson cycle. I have never had a Toyota product, Prius or other mode experience carbon knock in 20 years. Old carb engines...yes, all the time; because of poor combustion chamber design and inefficient carbs, etc. Plus, carbon knock would lessen the issue when removing the power to the coils

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Customer reply replied 2 years ago
Ok. Fair enough. Thanks
Toyota Mechanic: Toyota Service, Toyota Expert replied 2 years ago

You are welcome

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