Oil In the Airbox
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Junior Member
Joined: Mar 2002
Posts: 1
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From: Caryville TN
Oil In the Airbox
New Member Question...
89 F-150 4X2, 302 EFI.
I took the top off of my airbox yesterday to check the air and crankcase filter to find that my airfilter looked like someone set it on fire and put it back in the truck. And, the crancase filter has separated from the plastic that holds it to the airbox and was covered and dried out with oil. Upon taking all of this off, I noticed about 1/4 of an inch of motor oil in the airbox. I know that the tube to the crankcase filter comes from the filler neck on the engine to put oil in. But, my question is, why the #@&& and I getting oil in my airbox??? I had a similar problem on my wife's grand am (junker) and it turned out that the factory didn't use gasket between the upper and lower intakes and used silicone instead and this is what caused this. I've noticed that I've been losing oil for a while but haven't seen where it has been leaking under the veh. It doesn't smoke like a valve seal or guide. Could this be the culprit and what the heck can I do to fix it???? I replaced the PCV valve last summer and I've heard of someway rerouting the PCV to another spot on the vacuum tree.
Also, wondering if a EFI 302 could be converted to a carburated 302...easily? What would be involved? New tranny once the computer junk is gone?
Please help!!!
89 F-150 4X2, 302 EFI.
I took the top off of my airbox yesterday to check the air and crankcase filter to find that my airfilter looked like someone set it on fire and put it back in the truck. And, the crancase filter has separated from the plastic that holds it to the airbox and was covered and dried out with oil. Upon taking all of this off, I noticed about 1/4 of an inch of motor oil in the airbox. I know that the tube to the crankcase filter comes from the filler neck on the engine to put oil in. But, my question is, why the #@&& and I getting oil in my airbox??? I had a similar problem on my wife's grand am (junker) and it turned out that the factory didn't use gasket between the upper and lower intakes and used silicone instead and this is what caused this. I've noticed that I've been losing oil for a while but haven't seen where it has been leaking under the veh. It doesn't smoke like a valve seal or guide. Could this be the culprit and what the heck can I do to fix it???? I replaced the PCV valve last summer and I've heard of someway rerouting the PCV to another spot on the vacuum tree.
Also, wondering if a EFI 302 could be converted to a carburated 302...easily? What would be involved? New tranny once the computer junk is gone?
Please help!!!
Senior Member
Joined: Feb 2001
Posts: 385
Likes: 0
Poor breathing system can cause this. When is the last time you changed your PCV valve? If it gets clogged up, it will cause this to happen instantly. Are you sure you inadvertantly didn't overfill your oil pan the last time you changed your oil. I did that once, it wasn't good.
If you want to look into some high tech PCV valves, check out the krankvent systems. These things are probably overkill for an otherwise stock engine. They are made for harleys with blowby problems and cars equiped with totalseal rings (never buy these rings, they are crap!!! -- they claim 15hp but I think they mean -15hp, lol) I forgot the url but just do a search on krankvent in yahoo and it will pop up.
Check out the mustang boards on the EFI to carb swaps. I think it is fairly easy to do this, need the manifold, carb, fuel pump, and a few other wiring mods to do it. The mustang guys will help you out. Why not just upgrade your EFI system with a bigger TB, bigger injectors, larger fuel pump, etc?
kev
If you want to look into some high tech PCV valves, check out the krankvent systems. These things are probably overkill for an otherwise stock engine. They are made for harleys with blowby problems and cars equiped with totalseal rings (never buy these rings, they are crap!!! -- they claim 15hp but I think they mean -15hp, lol) I forgot the url but just do a search on krankvent in yahoo and it will pop up.
Check out the mustang boards on the EFI to carb swaps. I think it is fairly easy to do this, need the manifold, carb, fuel pump, and a few other wiring mods to do it. The mustang guys will help you out. Why not just upgrade your EFI system with a bigger TB, bigger injectors, larger fuel pump, etc?
kev
Senior Member
Joined: Jan 2001
Posts: 975
Likes: 0
From: W. Van., BC, Canada
I used to burn oil in an old hi-po Vdub at high rpm's and over 100mph. It generated so much crankcase pressure that the breather from the factory crankcase to carb was pushing oil vapours into the carbs. Trick was to use an aftermarket system from both valve covers that piped into a separate little box (to contain liquid) and then run to the carb/air filter.
Also keep in mind with older motors you will have more piston/ring blow-by gases, therefore higher gas pressures in the engine block/valve covers. If you or the previous owner wasn't doing regular oil changes then there may be oil gunk clogging the oil return passages in the heads causing oil to puddle around the valvetrain and possibly being blown through the pcv system into your air cleaning.
Anyhow, a few things to check over.
Also keep in mind with older motors you will have more piston/ring blow-by gases, therefore higher gas pressures in the engine block/valve covers. If you or the previous owner wasn't doing regular oil changes then there may be oil gunk clogging the oil return passages in the heads causing oil to puddle around the valvetrain and possibly being blown through the pcv system into your air cleaning.
Anyhow, a few things to check over.