1994 F150 4.9 PCV Valve Question - Ford Truck Enthusiasts Forums

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1994 F150 4.9 PCV Valve Question

 
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Old 02-17-2017, 02:34 PM
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1994 F150 4.9 PCV Valve Question

Hey what's up everyone, I just bought a 1994 Ford F-150 4.9l with ~138000 miles and I have some work to do on it. I plan on using it as my daily driver and to tow a small trailer with landscaping equipment. I bought it knowing I would have a couple of gasket jobs to do on it and any other maintenance that needs to be done. I have minimal mechanical knowledge, but my previous two vehicles taught me a lot (valve covers, trans pan, drum brakes, belt, fluid changes, etc.).

Anyways, the PO said the truck had been sitting for a month and wouldn't start. They weren't sure what was wrong and after replacing a bunch of ignition related parts they finally replaced the computer and it worked. So I test drove it and the truck drove great. Today, I started it and after idling for about 3 minutes the idle surged a bit and then stalled. I pulled off the PCV valve and saw a plastics piece (see picture) had cracked off and must of fell down into the valve cover. It looks like the original PCV valve so I'm not sure if this happened recently or what, it also doesn't rattle at all.

So I was going to replace it along with the hose, but as you can see my PCV valve has just a single hose connection that turns 90 degrees and connects into the PCV grommet. All of the PCV valves I've seen at advance auto, autozone, and oreillys have two hose connections coming from them (I'll include a picture). However, while searching online I noticed that the 5.0L engines have the PCV valve with just the single hose connector coming off of the valve like mine. Is it ok to use the PCV valve for the 5.0L on my 4.9L engine?
 
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Old 02-17-2017, 02:39 PM
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Bottom of PCV valve where I saw the broken piece of plastic (part that enters the grommet). Not sure when that broke off since I just bought the truck, but could that damage the engine?
 
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Old 02-17-2017, 02:42 PM
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Top of PCV valve and engine. I see that I need to replace the valve cover gasket as well, but I was also wondering why there would be oil on top of the valve cover? How could oil be getting up there?
 
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Old 02-17-2017, 02:45 PM
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Also does anyone know what that plastic electrical connector next to the PCV valve in that picture above is for? I just noticed that wasn't connected to anything
 
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Old 02-17-2017, 03:44 PM
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This is the one they say online goes with my engine the 4.9L, but as you can see in the pics I only have one hose connection
 
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Old 02-17-2017, 03:46 PM
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Mine looks similar to this one which they say is for the 5.0L engine. So I'm wondering if I could just use the 5.0 PCV valve on my 4.9L?
 
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Old 02-17-2017, 04:11 PM
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Originally Posted by LowcountryF150 View Post
This is the one they say online goes with my engine the 4.9L, but as you can see in the pics I only have one hose connection
As I recall when I did mine, you break off the tab between the two hose extensions and use the attached plug on the top extension. Problem solved.
 
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Old 02-17-2017, 04:13 PM
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Originally Posted by LowcountryF150 View Post
Bottom of PCV valve where I saw the broken piece of plastic (part that enters the grommet). Not sure when that broke off since I just bought the truck, but could that damage the engine?
That is the crankcase breather, not the PCV.




On a 4.9L engine the PCV is located on the passenger side of the engine on one of the intake runners.

 
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Old 02-17-2017, 04:16 PM
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Originally Posted by sandymane View Post
As I recall when I did mine, you break off the tab between the two hose extensions and use the attached plug on the top extension. Problem solved.
X2.....
 
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Old 02-17-2017, 04:18 PM
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Ok thanks, do you know what the point of the capped off connector is? Also do you have anything connected to that electrical connector next to the PCV valve on your truck? If you look at my second picture it's just hanging there not connected to anything.
 
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Old 02-17-2017, 04:20 PM
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Originally Posted by rla2005 View Post
That is the crankcase breather, not the PCV.




On a 4.9L engine the PCV is located on the passenger side of the engine on one of the intake runners.

Ohh ok thanks I'll go check that out right now
 
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Old 02-17-2017, 04:21 PM
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Originally Posted by LowcountryF150 View Post
Ok thanks, do you know what the point of the capped off connector is?
Most PCV valves are universal in nature meaning they fit various vehicles over a span of years. When you see dual ports like that it's usually a vacuum tie point. Therefore it eliminates another tee fiting.



Originally Posted by LowcountryF150 View Post
Also do you have anything connected to that electrical connector next to the PCV valve on your truck? If you look at my second picture it's just hanging there not connected to anything.
Ford had a fan blowing on the fuel rail at some point in time. Your fan is gone or it never had one. Best guess on that plug at the moment.
 
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Old 02-17-2017, 04:37 PM
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Originally Posted by rla2005 View Post
Most PCV valves are universal in nature meaning they fit various vehicles over a span of years. When you see dual ports like that it's usually a vacuum tie point. Therefore it eliminates another tee fiting.





Ford had a fan blowing on the fuel rail at some point in time. Your fan is gone or it never had one. Best guess on that plug at the moment.
Oh ok so nothing important, do you know why there would be oil on top of the valve cover? I wouldn't think the oil could get that high of it was just the valve cover gasket.
 
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Old 02-17-2017, 05:05 PM
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leaked oil moves backwards. Your VCG is leaking so bad it has accumulated there. Any leaks on the floor can be caused by the excess oil going backwards or other oil from other VCG or other areas. Fix that and then if you still have leaks, clean it all up underneath and start fixing. Felpro gaskets work very well IMHO. In Texas we fix everything. Fixing to go fishing. Fixing to eat etc. Regards Sandy
 
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Old 02-17-2017, 05:06 PM
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Originally Posted by LowcountryF150 View Post
Oh ok so nothing important, do you know why there would be oil on top of the valve cover? I wouldn't think the oil could get that high of it was just the valve cover gasket.
On many vehicles the crankcase has some pressure under load. The oil is pushed out along the gaskets, valve cover, breather, etc. Replace the PCV and gasket you will see if the pressure remains. Which means blow-by passed the rings.
 

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