Low Cost RX300 Oil Fix that works
#17
Moderator
I was expecting about 160psi, but really dont know the spec.
Salim
Salim
#19
Moderator
Thanks for posting the spec. I stand corrected.
Salim
Salim
#21
Moderator
Here is a fantastic thread on the VC replacement, complete with part numbers. I just did this and it went pretty smoothly. Great results too!!
https://www.clublexus.com/forums/rx-...lve-cover.html
https://www.clublexus.com/forums/rx-...lve-cover.html
#22
Moderator
And here's my thread including the VC replacement.
https://www.clublexus.com/forums/rx-...at-a-week.html
https://www.clublexus.com/forums/rx-...at-a-week.html
#24
Moderator
the Valve cover is a factory Part. You'd have to search for the part number, it's in the original thread on VC repalcement.
#25
#28
Racer
I was thinking about getting the valve covers on mine replaced w the newer design just as a sorta preventative measure; but; seeing as how I dont have any oil burning issues at the moment that i am aware of; Im not gonna go to the expense to do it as I also need the $ for other things at the moment.
#29
Driver School Candidate
Join Date: Mar 2017
Location: Ontario
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Just bought same truck same miles same problem
I have a '99 RX300 that I bought 5 months ago with 113k miles on it to do major highway driving. About 600-800 miles per week. Very quickly, I learned that, I too, had an RX300 that consumed HUGE amounts of oil, but it ran excellent! I read the forums. Called the dealer. Same message from everyone. Junk engine: $8k replacement, $3.5k for a long block. However, I was not convinced I had a bad engine. After much research and discussions with engine rebuilders, here is the long and short of it, Baseline data: '99 RX300 with 113k miles that used 1 qt of oil every 250-500 miles depending on engine load. 20 mpg. No smoke. Cyl compression varied from 145psi per cyl to 180psi per cyl. Again, it ran good. THE FIX: I ran 3 cans of Mopar Combustion Chamber Cleaner,MCCC,($8/can) in the intake with 500 miles between cans. Drove the car hard in between cans of cleaner. Once I ran the cleaner through, I took the valve covers off and replaced them with the updated ones at a cost of $400. No sludge. Cleaned out the intake (it was covered in oil) and omitted the PCV-intake hose and ran a hose to an external cone filter. Checked compression: 220psi per cylinder. Put in new plugs. I have 127k miles on it now and it has NOT used oil for the last 7000 miles. As it turns out, sticking piston rings caused excessive blow by which causes crankcase pressure which forces oil through the PCV and into the intake, which runs down into the cylinders and burns it through the combustion chamber. My research indicated that the MCCC is the best upper cylinder cleaner on the market. Local Chrysler dealer said the Ford dealer buys it from them by the case. The fix worked for me. No guarantees, but it makes sense. I did it all for $500. I'm much happier with my RX now.
Is this combustion chamber cleaner an aerosol that I will be spraying though the throttle body with the car ideling or is there more to it? Can I get a bit more info on the procedure you used for cleaning?
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