Burning oil at same rate regardless of oil thickness --- What does it tell us?

The gas pedal is not mechanically connected to anything in the engine bay. You are only pushing against a spring as the pedal controls an electrical device that sends signals to the computer asking for more or less power. It is drive by wire.

John (Britprius)

 

Unrelated I'd say. Is something blocking the gas pedal? Check your floor mat.

 

Then the mechanism is binding because it's 10 years old. A strange coincidence but that's the only logical answer. Do you have the service manual on pdf?

 

It's a multi-section service manual that was available for downloading a couple of years ago and maybe still is. The mods won't allow us to post pages from it on this site since it is copyright infringement but I'll look for the pedal in the service manual and try to find out what might be hanging up the pedal on your 04 and get back to you.

 

The accelerator pedal rod is a one piece assembly that is shown in the P112 hybrid vehicle control section of the service manual (Page HV-566 in the 2006 model year service manual to be precise). You might be able to take it apart and find out what's binding inside of it but the service manual does not provide any details of the pedal rod's guts.

If it's binding and the resistance you're experiencing in actuating it bothers you it seems your only option is to replace the pedal assembly with one from a junkyard.

The pedal assembly is held to the firewall with two bolts. It looks like it wouldn't be too difficult to replace it. The manual states the 12V aux battery needs to be disconnected before disconnecting the sensor connector from the accelerator pedal rod.

 

Any way to get that pdf service manual emailed to me? I want it. Those are awesome.

 

Allen,

Glad to hear you are seeing improvement with MMO. I didn't have any luck with it but as we discussed in another oil burning thread every car can be a little different. I tried Restore, Seafoam, MMO and a couple other things for the oil. Also tried Techron, Seafoam and a couple of other things with the gas. None of it slowed down the oil burn BUT none of it made it any worse except when I used a full quart of MMO because of its lower viscosity.

Anyway, I am mentioning this because I am very familiar with "The Burn" and Ema has 364,000 miles now and it really hasn't gotten any worse in the last 60,000 miles. I'm at about 1 quart every 1,500 miles or so or I was ....

I say I was because ... wait for it ... Ema's oil burning has shown significant improvement in the last month or two. She now is burning at only 1 quart every 2,000 miles and sometimes better right after an oil change. What is the difference? The ONLY thing I have done different is a switch to ethanol free gasoline whenever possible and when not possible I add 2 oz. of Lucas Oil Ethanol Fuel Stabilizer at fill up.

That is really the only thing difference and not only has it made a difference with the oil burn but my MPG's have gone from 35-40 MPG with ethanol gas to 44-49 MPG with non-ethanol. That is a HUGE jump and right at Ema's lifetime MPG and at her "Summer" MPG numbers the last couple years. Not only are the MPG's better but the engine is NOTICEABLY smoother, quieter has more power, etc... etc... How do I know? Driving so much I routinely go up numerous hills here in the south and almost always use cruise control. With a scangauge I don't let Ema go above 4,000 since the burn started and there are now hills I can go up with ethanol free gas at under 4,000 RPM that I can't with ethanol gas.

It might be something to try. I would give it at least a tank or two. I downloaded an app called Pure Gas to help me find ethanol free stations.

Good luck and happy driving,
Chris

 

Allen,

Sorry to hear about the closest non-ethanol station being so far away. I live near Lake Norman which is a big fishing and boating lake here so lots of gas stations carry non-ethanol in various grades for the boaters. The website I use is listed below and they do have an App available, although it could be A LOT better. I wish it was like Gas Buddy with member updates and times but it is decent.

Ethanol-free gas stations in the U.S. and Canada

As far as seeing lower oil consumption with 10w-40, that is the one thing that slowed Ema's burning before the pure gas did so I think that may be helping more than you realize. I am interested in the "engine soak" if/when you do it because I may try that as well. I know I know everyone will say why waste the money on a such a high mileage engine why not replace it completely or replace the car completely. That actually make more sense financially but I am curious to see what may be the exact cause and if it can be fixed. Pure engineering curiosity at this point, lol.

Anyway, I still do put about 2-3 oz of Seafoam in the last 500 miles before an oil change but have been doing that for a long time. That may have a cumulative effect on cleaning the engine but I think the pure gas is helping more. It also makes the engine run better as I noted. Your thread and the one beloew are the two main ones I follow regarding "The Burn".

2008 Prius - burning oil at 135,000 miles | PriusChat

Chris

 

PM me

JeffD

 

Everyone,

Ema passed emissions this morning!!!!! WOOT WOOT That means I have another year and 40,000 - 50,000 more miles that I can keep feeding her oil and seeing if anything affects "The Burn", lol.

Actually from my post back in February I have more data on her diminished oil burning when using non-ethanol gas. It is down to as little as 1 quart every 2,000 miles and that is if I push her hard at times over 4,000 RPM. If I keep her below 4,000 RPM on hills I could probably do 3,000 mile OCI's and not have to add any oil at all. She would be down to the lower dimple but is certainly not burning the 1 quart every 1,500 miles she was.

And as I mentioned before the engine sounds SOOOOO much better and smoother on pure gas. The power is better and the MPG is "summer MPG" or maybe better, lol. Ethanol sucks!!!!

Happy driving,
Chris

 

Burn rate is still normal specs

SM-N900P ?

 

Yaris hybrid, I suppose.

 

Yep, the piston soaks or oil ring cleaning in general are only effective at early stages of oil consumption at lets say 1qt/3000 miles. If you keep driving with stuck oil rings, they simply wear out .

BTW, 32 oz MMO for piston soaks is way too much. I use 1 oz per cylinder at one time.

Now, while the plugs show the expected ash from oil burning, whats wrong with the upper plug? Valve cover gasket leak?