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oil in intake and power loss at high rpm

Old 09-07-2015, 01:42 PM
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Exclamation oil in intake and power loss at high rpm

I have a 2006 MT with 100k miles and theres a lot of oil in the intake (the box was dripping) I bought it a few days ago expecting to have to pour some money into it eventually, on the test drive I didn't get above 6k rpm because the town it was in was very congested/ no open roads. on the drive home I hit the freeway and opened it up only to see that when i hit 6-7k in second gear it fell flat on its face. huge cloud of smoke behind me too. i drove about another hour calmly just trying to get home and when I was nearer to my home town i decided to press the clutch in and try to replicate the cloud, i revved to 8k a couple times with the clouds getting smaller each time and clearing up after 4-5 revs. at this point I had hoped that after sitting the engine just needed clearing out... I may have been wrong. later that day after i got home and took care of some personal matters I took the car out again because this issue was still concerning me. I went to a low traffic backroad and stopped then checked a few high revs in neutral again, first two revs had large clouds but pretty clear after that, I cycled through the gears hitting 7500 rpms each shift up to a 7k shift into 5th and everything was fine so i headed back home. it was roughly a mile to the interstate and when I hit the interstate the problem came back, i was at 7k in second gear on an incline when it stumbled and blew another cloud, this time the smoke continued through 4th gear with an extra large puff after each shift. setting that problem to the side I decided to go ahead and clean the maf and ecc / check my air filter. i cleaned the maf and pulled the airbox to find that my airbox was dripping oil and the air filter was missing (likely because the previous owner found it soaked with oil) what are the likely causes of this? I've heard it could be blowback from a clogged cat which imho would be the best case scenario. also maybe something to do with the "pcv like system" the 06 has? I can't find much info on how this system works and whether or not it actually has a pcv valve. the (solenoid?) on the left backside of the airbox is wet with oil but idk if thats just from me getting oil on my hands from pulling the box and then handling it, ill clean it up and see if new oil shows up. My first guess (which I really hope is wrong because I didn't plan on rebuilding for at least 5 more months) was that I had a bad oil seal in the rotor which could be causing the blowback but Id like to look into gutting my cat first and then learning more about this so called "Pcv like" system to see if a clogged valve or punctured hose or something is causing oil to be blown into my intake.
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Old 08-20-2017, 11:30 AM
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Just trying to revive this thread

Originally Posted by WranglerFan View Post
I have a 2006 MT with 100k miles and theres a lot of oil in the intake (the box was dripping) I bought it a few days ago expecting to have to pour some money into it eventually, on the test drive I didn't get above 6k rpm because the town it was in was very congested/ no open roads. on the drive home I hit the freeway and opened it up only to see that when i hit 6-7k in second gear it fell flat on its face. huge cloud of smoke behind me too. i drove about another hour calmly just trying to get home and when I was nearer to my home town i decided to press the clutch in and try to replicate the cloud, i revved to 8k a couple times with the clouds getting smaller each time and clearing up after 4-5 revs. at this point I had hoped that after sitting the engine just needed clearing out... I may have been wrong. later that day after i got home and took care of some personal matters I took the car out again because this issue was still concerning me. I went to a low traffic backroad and stopped then checked a few high revs in neutral again, first two revs had large clouds but pretty clear after that, I cycled through the gears hitting 7500 rpms each shift up to a 7k shift into 5th and everything was fine so i headed back home. it was roughly a mile to the interstate and when I hit the interstate the problem came back, i was at 7k in second gear on an incline when it stumbled and blew another cloud, this time the smoke continued through 4th gear with an extra large puff after each shift. setting that problem to the side I decided to go ahead and clean the maf and ecc / check my air filter. i cleaned the maf and pulled the airbox to find that my airbox was dripping oil and the air filter was missing (likely because the previous owner found it soaked with oil) what are the likely causes of this? I've heard it could be blowback from a clogged cat which imho would be the best case scenario. also maybe something to do with the "pcv like system" the 06 has? I can't find much info on how this system works and whether or not it actually has a pcv valve. the (solenoid?) on the left backside of the airbox is wet with oil but idk if thats just from me getting oil on my hands from pulling the box and then handling it, ill clean it up and see if new oil shows up. My first guess (which I really hope is wrong because I didn't plan on rebuilding for at least 5 more months) was that I had a bad oil seal in the rotor which could be causing the blowback but Id like to look into gutting my cat first and then learning more about this so called "Pcv like" system to see if a clogged valve or punctured hose or something is causing oil to be blown into my intake.
​​​​​​

I'm have a very similar issue except I do not have oil throughout my upper intake manifold. I'm just curious if you made any discoveries as to what it was?
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Old 08-28-2017, 08:59 AM
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its not a good sign tyler...

Mine did not last long. I made it about two months knowing I was replacing the engine in the spring anyways before I decided to hook up and OBD-II reader and log the data while replicating this power loss. I now have a data log in dash command labeled "snuff film" because this idea was the death of my engine.

It seemed that I had some worn seals and the oil backspray was blowback causing exhaust to get forced into the oil pan and then vent back out up the oil neck and onto the back of the filter and into the intake which was choking the engine out causing the power loss and smoke. I blew a seal, which in turn took out just about every other seal in that housing. My engine was grenaded.

If it comes to that and you have the means to do so, I can definitely recommend Kevin at rotary resurrection. I bought a reman off him and he was very fair on the price, he tolerated my insane amount of questions, did a lot of extra maintenance while he was under the hood, (most of which was at no additional labor expense) and had my car finished and back on the road in no time. 5 stars. Still running strong today.
Best to go to Kevin while your engine still runs as he will buy the working parts off of you if they aren't completely shot yet. in the case of mine he showed me the ruined cover plate, rotor, housing, and center plate that the fragments of seals had completely destroyed and he bought the other rotor, housing and end plate. Mine were fairly worn and I knew that so it wasn't much but better than what I would have gotten trying to sell them on eBay. He grades all of his parts and I believe mine were C.

The engine I bought from him was built with all A parts and he actually even suggested saving me some money with a B he had on the shelf that he said was a negligible difference for a decent amount less but I had taken a loan to get my car fixed and budgeted based on the top grade engine so I stuck to my word and took it and I am not disappointed in doing so. Like I said, still going strong today. Only Non standard maintenance I've had to take care of since is a dirty fuel filter that caused fuel starvation leading to detonation (I didn't let it do that but 2 times before I took action, its the most awful sound ever)

I'm no specialist, but you asked for an update on mine and that is my story. best of luck to you.

Edit: As for my CAT suspicion, I pulled the exhaust that weekend to find that my cat had already burned out. Not a hint of catalytic material to be found. Which means constant Check engine light for me :/

Last edited by WranglerFan; 08-28-2017 at 09:04 AM. Reason: Added info
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Old 11-05-2017, 08:40 AM
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RX8 engine & auto 4speed ecu wiring pinout
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Old 11-05-2017, 09:35 AM
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A compression check is needed for verification, but generally speaking puking oil means a new engine is needed. Or at least I’ve been trying to convince everyone here that’s the case for the last 8 or 9 years.

There still may be other issues, but bad internal engine seals are bad seals regardless
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