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Mine also had minimal carbon on the valves at 90k miles without doing anything. Though I have just started adding valve cleaner to my car maintenance routine.
I use it as instructed on the can of CRC valve cleaner & turbo. Basically I slowly sprayed can’s contents down a vacuum line while running at designated rpm range (I used the vacuum line that runs to the supercharger boost bypass valve). Then I turned off the car and let it heat soak for some time. Turn the car back on, smoke comes out the back similar to seafoam (though I didn’t have very much smoke). I think I then drove it at 60 mph for a while afterward.
What helped was buying a long piece (~6 ft) of vacuum hose from an auto parts store with the same ID as the original vacuum hose. Then I could sit in the car with the hose stretching to my drivers seat window. Hold the gas and squirt the stuff down the hose. Reconnect old hose when done.
I've just seen my intake valves for the first time and they're not too bad. I've used the CRC cleaner twice, the last time being nearly a year ago, but as I have no idea what the valves looked like before, I can't say whether the cleaning had any effect. I also have no idea if the prior owner ever did any cleaning...so I guess this post is meaningless.
said he got ~ 6oz over 4K miles. So perhaps not insignificant.
it's definitely slowed down how much oil the engine consumes. when i first got the car at just under 80k, I'd add a quart every 1500 - 2000 miles. now maybe only about 30% of that consumption. and every time i open it up, i get plenty of oil out of it. i built horizontal setup as i couldn't find a spot for a conventional setup.. tight in those engine bays!!
only other option would be make room with custom air intake / filter setup and remove factory filter air boxes.
what do you all experience for oil consumption? i used to think engine burned it via piston ring deficiencies, but i think it all goes into cylinders via intake air flow... i had lots of carbon barnacles on the valves
it's definitely slowed down how much oil the engine consumes. when i first got the car at just under 80k, I'd add a quart every 1500 - 2000 miles. now maybe only about 30% of that consumption. and every time i open it up, i get plenty of oil out of it. i built horizontal setup as i couldn't find a spot for a conventional setup.. tight in those engine bays!!
only other option would be make room with custom air intake / filter setup and remove factory filter air boxes.
what do you all experience for oil consumption? i used to think engine burned it via piston ring deficiencies, but i think it all goes into cylinders via intake air flow... i had lots of carbon barnacles on the valves
In my case I never had to top up until now between two oil changes on my XK (every 10.000 KM), and hope it will be the same on the XJ (both 5.0 NA).
Same here. My charge coolers were coated so I started to install a moroso catch can. I have it mounted but I am looking for so line connector that connect to the pcv valve but are straingt and not 90 deg.
I'm considering installing an oil catch can. I searched this Forum for detailed installation advice and recommended products without success.
Does does anyone have any experience with this company and its products? They appear to offer different kits for different years and models, but is this just marketing hype and it's really a one-size-fits-all catch can? https://www.repairmanuals.co/product...-oil-catch-can
Can you recommend a particular catch can and post installation advice with photos? Thanks in advance for your help.
these catch cans are junk. I had one and just threw it away a few weeks ago while cleaning my shop. I couldnt even bring myself to sell it to someone bc I have more integrity than to saddle some unknowing schmuck with that piece of crap
With a 4.2 SC engine there are significant benefits. On the 5.0 not so much because of better oil control.
On the 4.2 SC it will not just help alleviate the soft carbon build up in the TB but more importantly that build up in the charge cooler matrices which can all but block them after 60K miles and render them useless.
Many threads in here on this topic. Use Google to find them.
Not all catch cans are equal certain designs are better than others.
The other benefit beyond keeping throttle body and charged air cooler clean is keeping clean sensors measuring air temperature and pressure. When their are fouled with oil they will not measure correctly and DPF regeneration cannot be started. That was my case. I cleaned a sensor behind TB and issue was gone. With oil coming to combustion you will have more soot and carbon. DPF has finite number of regenerations. Less soot means less regenerations thus longer lifetime. I am going to install oil catch can too and clean everything between turbocharger and intake manifold. I’ve already bought catch can but not sure how efficient it is.
DPF is for Diesels only?
They are talking about DI Gas engines with buildup on the backside of the intake valves.
Diesels run so differently I am not sure how or where to rig up a catch can? The PCV system is so different between the two?
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). Found a home for it near the drivers side air intake.
I bought a used partial load breather line from a forum member who was parting out their car and cut it in half to use as a hose adapter. Connected rubber heater lines over these new adapters and linked up to the oil catch can.
Attached the aluminum bracket to the aluminum frame using aluminum rivets (3/16 inch). Had to drill a new hole in the included bracket, but everything is holding tight. Will update periodically with how much I collected from this setup.
Up close, near drivers side air intake. Used aluminum rivets to install the retaining bracket. Whole engine bay for reference.
03-29-2020, 12:46 PM
