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  #1  
Old 05-16-2020, 03:29 PM
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PCV mod question

Hi all,
I have completed this mod on my X. I had quite a bit of oil in the old ccv system, so I assume it had failed and was sucking oil into cylinders. Now that I have completed mod, how long can I expect it to smoke a bit from purging the residual oil crap in cylinders and such? Should I run anything, like fuel system cleaner, through it to help with purging?!? Also, if the ccv was not root cause of my smoking issues, what would happen if I ran it and it does not stop smoking(can engine damage occur from me running it, trying to purge oil residue)?!?! Thanks for any help!

Steve
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Old 05-17-2020, 06:28 PM
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- I'd remove the spark plugs and inspect them, if still good re-use them ( I use a tiny of anti-seize on the threads).

- If there is any oil in the cylinder, suck it out.

- A bit of smoke is OK, but it should go away quick.

- I last did this CCV Mod (the BavarianE39 CCV Mod) a few years ago and about 20K miles ago. So far ZERO oil consumption. Unbelievable mod.
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Old 05-17-2020, 11:29 PM
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Quote:
Originally Posted by cn90 View Post
- I'd remove the spark plugs and inspect them, if still good re-use them ( I use a tiny of anti-seize on the threads).

- If there is any oil in the cylinder, suck it out.

- A bit of smoke is OK, but it should go away quick.

- I last did this CCV Mod (the BavarianE39 CCV Mod) a few years ago and about 20K miles ago. So far ZERO oil consumption. Unbelievable mod.
Any signs of excess vacuum? Any change in fuel mileage? I'm considering doing this mod myself.
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Old 05-19-2020, 04:28 AM
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cn90,
Thanks for reply. Days ago, I did remove plugs, looked in there, and also cranked over engine a bit to purge any residual liquid oil in cyls. Not much came out at all on purge attempt(a few specks on paper towel covering cyls). There was a bunch of dried gunk in cyls, in ccv tubes(after I cut them open for mod), air distribution piece, etc.(dried hot choc EVERYWHERE) and a little dripping down drain tube from oil sep. I cleaned off plugs, reinstalled them all, put everything back together, completed PCV mod and fired it up. There was a bit of white smoke still coming out. Seemed to get a little heavier when I rev'd engine, but engine sounded good. I only ran engine after a couple starts for about 20-30 secs each time cuz I got freaked about engine locking up. So, my question is.......when ya say "a bit of smoke is ok, but should go away quick", what does quick mean here......30 secs? 1 min? 5 mins? 15 mins after start???? Should I drive it around and see what happens?
Pic is of opened spark plug well, looking in, BEFORE putting it all back together and doing PCV mod
Thanks for any help. I'm learning more and more each day

Steve
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Old 05-19-2020, 04:52 AM
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Ok, so update.........I just went out and fired it up again, after letting it sit for a few days since I put it all back together. NOT ONE PUFF of smoke or anything upon startup or for a few mins, until engine began warming. Then began seeing some very mild smoke off and on, not bad at all. I'm assuming that since the car had the mod done/cyls purged a bit of residual/sat idle a few days and remaining oil residue dried up, that the light smoke was generated from leftover oil residue heating up in there and starting to burn off as engine ran?
Engine idle sounded great and smooth, revs were strong and unwavering
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Old 05-19-2020, 07:08 PM
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Another update: Ran X for a while today and drove it down the block. Smoke is definitely greatly lessening, although not totally gone yet(barely a visible trickle now-slightly increases with higher RPM). Did a pressure test on cooling system(pressurized it to 5psi-didn't wanna go higher from what I read) and it held steadfast firm and no leaks, so that should be good to go there(I used the Pittsburgh brand set from Harbor Freight---has a BMW fitting included that worked perfectly). Pulled dipstick after shutting it off upon reaching op temp and stick had a little bit of vacuum on it(not super high, but def more than before mod) topped up oil to normal, checked coolant and all looks good. Wondering if I should run a can of fuel treatment through it to help clean out residual gunk n stuff. Gonna order new plugs to have on hand. Engine sounds great

Oh, one other thing........Anyone know how to get to live fuel trims on a Foxwell NT520 Pro?!?! I had it hooked up, but couldn't find that area to see about live readings.


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Old 05-19-2020, 09:41 PM
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Quote:
Originally Posted by Blackjetvette97 View Post
Another update: Ran X for a while today and drove it down the block. Smoke is definitely greatly lessening, although not totally gone yet(barely a visible trickle now-slightly increases with higher RPM). Did a pressure test on cooling system(pressurized it to 5psi-didn't wanna go higher from what I read) and it held steadfast firm and no leaks, so that should be good to go there(I used the Pittsburgh brand set from Harbor Freight---has a BMW fitting included that worked perfectly). Pulled dipstick after shutting it off upon reaching op temp and stick had a little bit of vacuum on it(not super high, but def more than before mod) topped up oil to normal, checked coolant and all looks good. Wondering if I should run a can of fuel treatment through it to help clean out residual gunk n stuff. Gonna order new plugs to have on hand. Engine sounds great

Oh, one other thing........Anyone know how to get to live fuel trims on a Foxwell NT520 Pro?!?! I had it hooked up, but couldn't find that area to see about live readings.


Steve
Use the OBDII function, not the BMW
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Old 05-20-2020, 10:01 PM
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Quote:
Originally Posted by Fifty150hs
Any signs of excess vacuum? Any change in fuel mileage? I'm considering doing this mod myself.
- Vacuum: a bit more than stock but no big deal.
- Fuel Mileage: I did not measure it before vs after, so idk. But probably better bc engine seems to run better after mod.

@Blackjetvette97: spark plugs, even fouled with oil, can always be cleaned with gasoline. Change them ONLY if the gap is too big or they have accumulated > 80K miles.
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Old 05-31-2020, 10:27 PM
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Did this mod today. I added a catch can to be sure I won't be adding any oil to the intake. I keep records of my fuel and oil consumption so I will be able to see if this mod does anything beyond stopping or lowering oil consumption. Checked my oil level before I started and it was right between the lines. Looking forward to seeing the results.
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