pcv problem??? other problem with oil
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Senior User
Joined: Oct 2005
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From: Cincinnati
pcv problem??? other problem with oil
I have a 1992 f-150 with the 5.0 v8, I am having a few problems with my engine. maybe somebody can point me in the right direction. I have noticed a loss in power of my engine at low rpm's, almost like a plug is fouled out or something, so first I removed the air box lid, and there was oil under the air filter and got the air filter dirty with oil, there was no filter to the line coming into the box from the oil filler piece on the valve cover. I have heard multiple theories on why the truck is burning oil, from bad piston rings to seals under the valve cover. my guess to the problem is for some reason the oil gets in the air box, then gets injected into the motor, and in turn fouled a plug out, but why would the oil get in the air box in the first place???? there is nothing in the line from the valve cover to the air box to stop the oil from getting in. any help would be much appreciated on what to look for.
Hotshot
Joined: Oct 2003
Posts: 17,791
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From: Ashland City, TN
All 3 of my fords have done it, even my tempo.
The v8's have bad placement on the PCV from what i've read on here. Some of the guys have modified theirs to a different place.
When you have PCV blowby, its a sign of..... (another member needs to fill this in)
The v8's have bad placement on the PCV from what i've read on here. Some of the guys have modified theirs to a different place.
When you have PCV blowby, its a sign of..... (another member needs to fill this in)
Junior User
Joined: Jun 2006
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From: Victoria B.C
Originally Posted by Talyn
All 3 of my fords have done it, even my tempo.
The v8's have bad placement on the PCV from what i've read on here. Some of the guys have modified theirs to a different place.
When you have PCV blowby, its a sign of..... (another member needs to fill this in)
The v8's have bad placement on the PCV from what i've read on here. Some of the guys have modified theirs to a different place.
When you have PCV blowby, its a sign of..... (another member needs to fill this in)
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Senior User
Joined: Oct 2005
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From: Cincinnati
thanks for answers
hey guys, thanks for the information. is there any possibility that it isnt the rings???? because I really dont have the time to rip the whole engine out of the truck. is there any other temporary fixes?
Freshman User
Joined: Dec 2003
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i had a lot of oil in my air filter one time and it was caused by the vacuum hose for the pcv. the hose comes off a nipple on the back of the plenum. that angled nipple was clogged. removed it and cleaned it out with carb cleaner. put new pcv and hose replaced the little paper filter in the air box and put a K&N filter. havent had it again yet.
few months later i rerouted the vacuum for the pcv. i plugged off the port on the back of the plenum and t-d off of the brake booster. just remember to clean out the tree on the plenum every so often with cleaner.
hope this helps
--faceman
few months later i rerouted the vacuum for the pcv. i plugged off the port on the back of the plenum and t-d off of the brake booster. just remember to clean out the tree on the plenum every so often with cleaner.
hope this helps
--faceman
Elder User
Joined: Nov 2005
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Assuming that your rings are badly worn and causing lots of ecessive blow by, there is a tempoary measure you can take to eliminate the oil plugging the air filter. Remove the hose between the air filter box and the fitting on the valve cover. Purchase a long piece of hose the same size. Attach one end at the valve cover, and route the hose down and back towards the tranny. Keep it away from anything real hot, and get the end low as possible. Use wire ties to keep it in place. The excessive blow by will exit this tube and carry oil with it. It ain't going to pass emissions test, and it ain't good ecologically speaking, but it will keep the oil out of the filter until you can afford a rebuild. Depending on how bad the blow by is, this set up may smoke. It will definitely stink. Don't let the oil vapor blow onto the hot exhaust or the smell will be really bad.
In the old days, engines were built with a road draft tube that performed the same thing.
Good luck Frank
In the old days, engines were built with a road draft tube that performed the same thing.
Good luck Frank
New User
Joined: Nov 2006
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you may also have sticky oil rings or gummed up rings
dump a half a liter of atf in your engine oil, it wont hurt anything, it will actually clean your engine, i use it all the time
I have also used a cup of deisel fuel in my oil, when i buy an old engine that has alot of crud in the valve covers
the gasoline we use today, is garbage, it creates many problems
dump a half a liter of atf in your engine oil, it wont hurt anything, it will actually clean your engine, i use it all the time
I have also used a cup of deisel fuel in my oil, when i buy an old engine that has alot of crud in the valve covers
the gasoline we use today, is garbage, it creates many problems
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New User
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I just posted this earlier... sounds like we could have a similar problem. how many miles on your truck?
I have an '88 F-150 with a stock 302 w/ 5spd. 215,000 miles. it was bought with 130,000 miles and the engine was strong. My Dad had it for a number of years and I just got it back. It definitely does not run like it used to. Symptoms are: valves ping under load; less power, especially under load at 1500-2000 rpm. Engine needs to be around 2000 rpm or higher to cruise smoothly - it used to run perfectly smooth at lower revs. almost impossible to accelerate under 2000 rpm - engine really struggles. is there a typical life expectancy for a 302?
I have an '88 F-150 with a stock 302 w/ 5spd. 215,000 miles. it was bought with 130,000 miles and the engine was strong. My Dad had it for a number of years and I just got it back. It definitely does not run like it used to. Symptoms are: valves ping under load; less power, especially under load at 1500-2000 rpm. Engine needs to be around 2000 rpm or higher to cruise smoothly - it used to run perfectly smooth at lower revs. almost impossible to accelerate under 2000 rpm - engine really struggles. is there a typical life expectancy for a 302?
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Senior User
Joined: Oct 2005
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From: Cincinnati
i have about 140,000 miles on the motor. pretty close to the same symptoms. i do not know the life expectancy, but i havent been too thrilled about the 5.0, the whole overall setup is just plain stupid i think, but i dont know for sure
Senior User
Joined: Apr 2003
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From: Edmonton, AB Canada
Originally Posted by mreggball
I just posted this earlier... sounds like we could have a similar problem. how many miles on your truck?
I have an '88 with a stock 302 w/ 5spd. 215,000 miles. the is there a typical life expectancy for a 302?
I have an '88 with a stock 302 w/ 5spd. 215,000 miles. the is there a typical life expectancy for a 302?
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 99
From: Ashland City, TN
There has to be another cause of blow by.
My tempo had 59k miles on it when I got it from my grandma. It had blow by from the day i got it.
I Can understand rings wearing and such, but it shoudln't be that bad.
A compression test should be able to tell you if your rings are not working properly.
I do belive.
Havn't heard of ATF in the engine before.
Lucas or something should do the same thing.
My tempo had 59k miles on it when I got it from my grandma. It had blow by from the day i got it.
I Can understand rings wearing and such, but it shoudln't be that bad.
A compression test should be able to tell you if your rings are not working properly.
I do belive.
Havn't heard of ATF in the engine before.
Lucas or something should do the same thing.
Senior User
Joined: Apr 2003
Posts: 448
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From: Edmonton, AB Canada
A compression test will show you the general condition of the motor, but a leak down test will show you where you are losing the compression to. A compression test is still a good idea, and is simpler and a compression tester can be rented at your local parts store.
Trailering
Joined: Nov 2002
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I had a significant amount of blowby coming out of my crankcase filter that I made a bottle to collect all the oil that would drip out. The oil fill cap would always have a significant amount of white/yellow grease buildup on it as well. Over a three year period, I went through 3 PVC filters (all Canadian Tire brand) before realizing that I may need an engine rebuild.
But just this summer, I decided to replace the PVC filter with an original Ford brand ... and guess what ... it was fixed!!! No more crud and a nice clean crankcase filter. Weird, but it worked.
But just this summer, I decided to replace the PVC filter with an original Ford brand ... and guess what ... it was fixed!!! No more crud and a nice clean crankcase filter. Weird, but it worked.
Posting Legend
Joined: Sep 2001
Posts: 30,255
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95% of the time bad "apparent blowby" is caused by a bad PCV valve. Have any of you replaced the PCV valve and cleaned the system? The valves do go bad and just because they rattle does not mean they are any good. Replace them annually with a new unit. DO NOT connect the PCV to the brake booster line! Make sure the passage into the engine is totally clear and connect it at the right spot.