Oil In intake

[Yellowpnoy]

Hey guys, i have a question on oil in the intake. I have a edlebrock performer manifold on my car and i noticed that when i let off the throttle, the car will puff a grey smoke like its burning oil. I pulled all the plugs and sure enough every one of them has oil on them. I thought it was something in the valvetrain, but i decided to pull the intake, and there was a pretty big puddle of oil laying in the back of the intake and in the center where the vacuum tree is mounted, it was so deep it ran out of the back when i removed the backplate. I cleaned it out and reinstalled everything and the smoking went away, but after a few minutes it was back again. I pulled the intake backplate off again, and there was more oil which looked like it was sprayed onto the backplate. I pulled the whole intake off the car and noticed that the phenolic spacer i had installed was actually starting to soak with oil, and all the runners were coated. Mind you, since i worked on the car last time (when i installed the phenolic spacer), i have put MAYBE 15 miles on the car. The pcv system has 2 fittings coming off it, and only 1 is run to the manifold and the other has nothing on it. Is this the sign of a bad PCV system? Or do you think it is something else? Any help is appreciated, thanks guys!

Anthony

 

[RacEoHolic330]

You're blowing oil past the rings. Thicker oil will band-aid that problem. Im not sure if your problem goes deeper than that though.

 

[sgarlic]

So you didn't have this problem prior to putting that Edelbrock intake on?

 

[Yellowpnoy]

I did have the problem before, i bought the car used and the intake was already on there. The guy i bought the car off of said that the motor only had 3000 miles on it, which it actually does. I only bought the car because the body was so straight and the paint job is awesome. If its the motor, i dont really care, i was planning on changing it anyway, just not this soon.

Anthony

 

[bill302]

run a compression test on each cylinder this will tell you if you have blowby you can buy a compression guage at wal-mart for about $20 and click on link below it will tell you the proper way to run a compression test...post results...

http://www.pumaracing.co.uk/comp.htm

 

[DouglasOhio]

this is the exact same problem im having, and i never noticed the problem before installing my edelbrock performer intake. So is this definitely rings or is there other issues that could be so? my engine was supposedly rebuilt about 10k ago, (only 3k before i got it)

 

[Yellowpnoy]

I just ran a compression test on the motor. The motor is a 306ci with Trick flow heads and comp 284hr cam.

#1-150
#2-150
#3-150
#4-150
#5-155
#6-160
#7-150
#8-150

Most were spot on 150psi, except for #6&5, does this sound right to everyone, or do i have a bigger problem than i first thought? Thanks for all your help so far guys, i really appreciate it!

Anthony

 

[SeventyMach1]

Compression looks good. If you can't figure anything else out, get an oil seperator (or make one). If oil starts accumulating in very large amounts, you KNOW you have a problem somewhere.

 

[Yellowpnoy]

Thanks for the reply, i didnt think the compression was too bad either. I removed the PCV valve and the grommet and the valve are extremely loose in the port. I think i am going to put a new one in it with a grommet, and also get an oil seperator. Thanks!

Anthony

 

[Black1987Stang]

theres plenty of people that have this problem also, do a search and youll see plenty and prob see how they fixed theirs....i def. vote pcv system too....also heard if someone took off the baffle in the valve covers to install roller rockers this can do it too, although i took mine out and mine doesnt have any oil in my gt40 so maybe its a coincidence or something. btw compression looks fine, recheck all the pvc, metal strainer thats under the pcv valve, grommets, etc, u can use silicone and help seal the grommet in too

 

[Yellowpnoy]

Thanks man, i appreciate the help. I just looked everything over again, cleaned out the intake and drove it probably about 1000ft, brought it back in, took the backplate off the intake, OIL, had already started to run. I will have to go over the whole PCV System, but thanks again for all the help you guys have given me!

Anthony

 

[SeventyMach1]

One more thing ..... don't settle for the cheap PCV valves at the parts store!!! Even if they're application specific. They fit loose. Get an OEM Ford one.

 

[vristang]

I have been fighting this for a while now, so if you do a search on the subject you will most likely find a few posts by me.

Here is a summary anyway.

Find out where the oil is coming from.
Pull the Throttle Body/Valve Cover hose from the TB. If it is wet with oil then this is an entry point. The normal causes of this are excess blowby (which you already ruled out), or the VC baffle has been removed for rocker clearance.

Next pull the pcv hose. Again if it is wet with oil then that is an entry route. The best solution I have seen for this is a separator from Home Depot or Lowes. For about $25 for the separator and fittings you will be able to remove most of the oil before it gets to the intake. Also, You need to verify that the pcv screen is in place. This often forgotten part is located underneath the pcv in the back of the intake, and helps remove oil mist from the crankcase gasses.

From what I have seen the oil accumulation will be greatest when the car is left to idle for some time (stuck in traffic or idling in the driveway), then with some rpm the oil is picked up and thrown into the combustion chamber.

This is a pic I took of mine when it was at its worst. The car had been at idle for several minutes before I shut it off.
http://forums.stangnet.com/attachment.php?attachmentid=37228&d=1123979745

Hope this helps some,
jason

 

[gt90stang]

I had a performer intake and it sucked oil like crazy. The baffle under the intake is very small and doesn't cover much area and on mine it was bent such that it caused gravity to pull oil towards the PCV valve...not good. Start by bending the baffle so it will allow gravity to pull oil away from the PCV valve. Then put a restrictor in the hose that goes between the TB and valve cover as this will slow down the airflow and reduce oil being sucked by the PCV. My restrictor had a 1/16" hole in it and worked pretty good. You can see my restrictor at:

http://www.geocities.com/dbennettya/Mustang_PCM/restrictor.JPG

and

http://www.geocities.com/dbennettya/Mustang_PCM/restrictor_in.JPG

YMMV, Don

 

[vristang]

Reference:
Home Depot
This is the Fram pcv screen, even though the pic is wrong
This is the NAPA pcv screen with a correct sketch of the part

 

[795.0pacecar]

I had the same problem. Make sure the PCV screen is in place.

 

[backfocus]

The pcv system has 2 fittings coming off it, and only 1 is run to the manifold and the other has nothing on it. Is this the sign of a bad PCV??

Please forgive me if I am wrong, he said he has a 2 fitting PCV valve and one is open. Shouldn't it be at least capped of. I am not sure it will fix the oil in the intake, but it would stop it from spewing all over the back.

I have a GT40 intake, but use a one fitting PCV valve. I would check for the filter too.

I don't know maybe I read it wrong.

 

[Yellowpnoy]

The one PCV hose fitting is capped off, i will check the baffle for the intake, i guess this means removing the intake and checking everything. Oh well. The PCV Valve hose is wet with oil and the PCV Valve rattles, i know they are supposed to, but the bottom of the valve is soaked and so is the hose. That is where it looks like its coming from, and also it looks like it is coming is throught the baffle, i havent removed that baffle but i will check everything. Thanks guys!

Anthony

 

[mustangsquared]

I am having this problem also...on a rebuilt (completely machined and squared block) with only 1200 miles on it. I had the issue before I rebuilt it as well. I put a breather on the right side (under the TB) and it spits oil all over the valve covers and I get oil in the intake via the PVC. I have good compression. I just dont understand why it keeps doing it. I will get a seperator for the the PVC but the oil on the valve covers is really teeing me off....I hate smoke coming out from under the hood.

 

[backfocus]

I put a breather on the right side (under the TB) and it spits oil all over the valve covers and I get oil in the intake via the PVC.

Not suppose to do that creates less vacum in the crankcase or something like that, Do a search it has been said many times no breathers on EFI systems.