Recent Topics
Fireworks Stores
by Warstud
5 minutes 30 seconds ago
1994 Ranger fuel tank/frame cleanup & NOS part
by 01rangerxl
14 minutes 56 seconds ago
Koreans top J.D. Power qlty; Ford, GM, FCA make strides
by wemay
23 minutes 49 seconds ago
How Fast to Run a ZeroTurn Mower
by Gebo
31 minutes 38 seconds ago
Bosch 3300 C&P Yamaha FZ-07
by bmwpowere36m3
52 minutes 13 seconds ago
My FIL in hospice
by fdcg27
Today at 08:41 PM
Spraying Polyurethane
by Texican
Today at 08:37 PM
Dehumidifier icing
by Kestas
Today at 08:37 PM
Diesel lube in Petrol Engine
by Ducked
Today at 07:46 PM
New key programming cost
by 92saturnsl2
Today at 07:27 PM
When you help someone and its time to walk away
by RazorsEdge
Today at 07:09 PM
Sightly overfilled oil..ok or drain?
by flinter
Today at 07:08 PM
Wheel says 50 mph max
by pda1122
Today at 06:54 PM
15w40 Maxlife in Motorcycle
by Brian553
Today at 06:39 PM
BITOGer in Ottawa/Orleans Canada area ? ...
by Papa Bear
Today at 06:36 PM
Old Engine SOUND
by MasterSolenoid
Today at 06:06 PM
ProMotive PH 2500 CUT OPEN
by car51
Today at 04:54 PM
go green or Dexcool?
by umungus1122
Today at 04:50 PM
Latest info on ExxonMobil synthetic base stocks
by Gokhan
Today at 04:49 PM
Pennzoil Platinum 5w30 - $3.21/qt Amazon
by SnowmanCO
Today at 04:37 PM
Newest Members
bcj, Ilia, nmac9, Theraven, battleman13
65279 Registered Users
Who's Online
110 registered (01rangerxl, 4WD, 87sammy, 97f150, 2003f7, 16 invisible), 1431 Guests and 57 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65279 Members
67 Forums
285678 Topics
4767638 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 3 1 2 3 >
Topic Options
#4562902 - 11/03/17 11:13 AM MMO Piston soak Prius
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Hey everyone I'm chasing down a misfire on my wifes 2011 Prius. The issue is oil is getting into the combustion chamber and is coating the plug causing no spark/misfire. P0303 is the code. The plug looks like someone dipped the electrode/threads in a vat of oil. It's coming from underneath the plug so not an easy valve cover gasket fix frown. That means it's one of two things. The valves or the rings. I tried doing a piston soak on cylinder 3 only and still no go. I pulled the denso plug on cylinder 3, poured around 4 oz of MMO, let it sit overnight, came outside the next morning, looked down the spark plug tube, and the piston was bone dry. That means the mmo leaked past the piston. I cranked up the engine (with the plug out on cylinder 3) with a rag above the hole to see if any mmo would splash out and nothing. Is it normal for MMO to leak past the piston in 8 hours or so?

Top
#4562915 - 11/03/17 11:35 AM Re: MMO Piston soak Prius [Re: Rtstrider]
nthach Offline


Registered: 01/02/04
Posts: 3895
Loc: California
Prii are known for oil consumption as they get older - Toyota isn't really acknowledging the fact but there's reports of the 3rd gen cars using oil at lower mileages. The 2nd gen cars will start burning oil around the 150-200K mark. I suspect the piston rings and lack of engine braking are causes of this.

How many miles? If you're still within powertrain warranty, might be time to have the dealer document this and do their own oil "consumption" test which involves topping off and placing tamper seals on the oil cap and dipstick for 1000 miles. Rings don't create a perfect seal. 8 hours is a long time, if it runs out within minutes with MMO or any oil you have a problem.

Top
#4562925 - 11/03/17 11:43 AM Re: MMO Piston soak Prius [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
The car has around 160k on it

Top
#4562930 - 11/03/17 11:49 AM Re: MMO Piston soak Prius [Re: Rtstrider]
nthach Offline


Registered: 01/02/04
Posts: 3895
Loc: California
Sounds like she's using oil at that age. Nothing you can really do except find a good used engine from a wrecker(not a pick and pull) or rering the engine. You can try a thicker oil to slow down consumption, my 2nd gen uses less oil on M1HM.

Top
#4562949 - 11/03/17 11:58 AM Re: MMO Piston soak Prius [Re: Rtstrider]
Kool1 Offline


Registered: 01/25/13
Posts: 906
Loc: California
What is the condition of your other cylinders? If the problem only exists in one cylinder, I would possibly suspect a stuck ring and would consider trying more MMO. Check the spark plugs from the other cylinders, if they aren't looking to good, then it's probably time for some major work.

Top
#4562962 - 11/03/17 12:12 PM Re: MMO Piston soak Prius [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Hey Kool it's just cylinder 3. The plugs foul crazy quick on that cylinder. The plugs on the others have no issues. Should I do another piston soak with mmo at the tail end of this oil change even though mmo is already in the oil?

Top
#4562964 - 11/03/17 12:13 PM Re: MMO Piston soak Prius [Re: Rtstrider]
nicholas Offline


Registered: 08/20/03
Posts: 728
Loc: ottawa
Try BG 109 or BG EPR <Same product>

I had great results unsticking some audi rings that were seriously gummed up.

Amazon or ebay are your best bet.

Top
#4562968 - 11/03/17 12:18 PM Re: MMO Piston soak Prius [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
Hey Nicholas I'll try that at the tail end of this change. Right now we are just keeping an eye on the oil level and color.

Top
#4563030 - 11/03/17 01:49 PM Re: MMO Piston soak Prius [Re: Rtstrider]
CR94 Offline


Registered: 03/20/16
Posts: 1120
Loc: Western S.C. since 1996
Probably coked rings and plugged oil drain holes in the piston, same as with many other Toyotas (e.g., 2007-10 4-cylinder Camrys) and others susceptible to that problem. What kind of oil has been used in it? Change intervals?
_________________________
2011 Toyota Prius now at 88K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K

Top
#4563051 - 11/03/17 02:08 PM Re: MMO Piston soak Prius [Re: Rtstrider]
nthach Offline


Registered: 01/02/04
Posts: 3895
Loc: California
Originally Posted By: Rtstrider
Hey Kool it's just cylinder 3. The plugs foul crazy quick on that cylinder. The plugs on the others have no issues. Should I do another piston soak with mmo at the tail end of this oil change even though mmo is already in the oil?

In that case what I did was run Lubro Moly's engine flush with the car in maintenance mode for 20 minutes. I then changed the oil with Castrol Edge HM, the oil usage got better. About 500 miles out from an OCI, I ran a pint of MMO and changed the oil when it was time. This time I used M1HM and I saw a marked change in oil consumption.

I think running MMO in the oil will help it do its work longer than a piston soak. The Lubro Moly flush works in the same concept as BG EPR 109.

Top
#4563056 - 11/03/17 02:16 PM Re: MMO Piston soak Prius [Re: Rtstrider]
cjcride Offline


Registered: 11/06/09
Posts: 1814
Loc: Ontario Canada
Rtstrider, did the car get a steady diet of synthetic oil and still develop the oil burning?

Top
#4563077 - 11/03/17 02:49 PM Re: MMO Piston soak Prius [Re: Rtstrider]
andyd Online   content


Registered: 09/25/04
Posts: 7143
Loc: Marshfield , MA
Have you done a compression test?
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

Top
#4563086 - 11/03/17 03:01 PM Re: MMO Piston soak Prius [Re: Rtstrider]
Rtstrider Offline


Registered: 10/14/06
Posts: 460
Loc: Southeast
The car was new to us as of March this year. The previous maintanence was all done at the dealer. Since we have had it it's been on mobil1 0w20 for a 10k mile change (dipstick was bone dry but that was the recommended interval I found online), the next 2 changes were bulk oil 0w20 from a mechanic that was troubleshooting this issue for 5k miles, mobil1 0w20 high mileage for 3k miles untouched, piston soaked and ran a pint of mmo for 1k more miles. Oil was drained and it's now on 3.5 quarts supertech 5w30 high mileage and 1 quart mmo. This change is going to be run to 3k max or when the oil darkens (which ever comes first). The first mechanic supposedly did a compression test and said it looked good. The plan was to run mmo for the next couple of oil changes to see if that helps. I don't mind doing an oil flush at the end of this change. I had eyeballed kreen due to previous reviews on bitog but I'm game for bg and lubro moly if those are just as good.

Top
#4563106 - 11/03/17 03:36 PM Re: MMO Piston soak Prius [Re: andyd]
CT8 Offline


Registered: 10/09/14
Posts: 10963
Loc: Idaho
Originally Posted By: andyd
Have you done a compression test?
This !
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

Top
#4563130 - 11/03/17 04:07 PM Re: MMO Piston soak Prius [Re: Rtstrider]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
With that kind of oil showing up on the plug I would suspect the rings are so bad in the cylinder that it would show much lower compression and if it does no matter of quick fix it going to solve the problem other than yanking out the bottom end and putting new rings in. If compression is fine suspect the valve seal is the culprit on that cylinder and that isn't an easy fix. You could try High Mileage oil in that situation.

I also wouldn't use thicker oil especially in a Prius if the engine isn't running all the time. (Not sure if that is the case with your model).



Edited by StevieC (11/03/17 04:08 PM)
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

Top
Page 1 of 3 1 2 3 >