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Of course you CAN use Seafoam. Here’s a likely follow up question for several days later. Just copy and paste: “Why is the oil pressure light flickering? Everything was fine until I flushed the engine with Seafoam.”
SHOULD you use Seafoam on a high mileage engine that otherwise seems to be okay? Heck no! With the PCV system back to normal, just change the oil and filter and keep an eye on it. Don’t risk loosening up crud all at once and having it clog the oil pump pickup screen.
Slowly clean the engine with frequent oil changes. Don’t rush the process.
Earlier this summer I had to get the seals on the valve covers replaced since oil was leaking
Assuming a competent person did this job, it's most likely that the PCV valve was reinstalled at the time (it will have been removed as he changed the gaskets).............so it has probably only been hanging loose since sometime more recently.
On the other hand, if the person doing the valve cover replacement was less than competent, the PCV valve may have been left out at that time. Either way, one has a probable timeframe.
I'm going to say you're wrong and I'd even go so far to say that if you left the pcv valve out of the valve cover, flow would go the opposite way. Incoming air rushing through air cleaner would create a Venturi and draw gasses from the crankcase into the intake. That would also cause some oil residue on the pcv filter inside the air cleaner. I bet it flows better than a road draft tube. Back to my first reply, crankcase IS vented, but trash can get in the valve cover.
Fine with me. An opinion is similar to an as$-hole, everyone has one.
If you find the spare time, GOOGLE PCV and report what you draw from it.
Having the PCV (valve) missing out of the hole like above just means the crankcase is not actively scavenged, it is still vented.
Now considering the inlet for the PCV system in EFI engine is after the air filter the will be a pressure drop in that spot due to the air filter so it will be scavenging into the induction tract, or flowing in reverse.
The issue is the hole from the missing PCV will be sucking in air and any debris also.
I'd say the way I did originally. It's venting, but will suck in dirt and debris. I would probably look into why it came out. Did it get tugged on or did excess pressure build and blow it out.
On the other hand, if the person doing the valve cover replacement was less than competent, the PCV valve may have been left out at that time. Either way, one has a probable timeframe.
Hi David.......good down here thanks! Just waiting for the sun to shine!
Not sure what there is to respond to. Pretty straight forward. The Inlet or fresh air feed for the PCV on EFI engines is AFTER the air filter or on the filtered side. To draw air through the air filter you have to reduce the air pressure on the filtered side , this is true of ALL air filters in ANY application, In this application, the pressure is reduced by the engine to lower than ambient to draw air through the filter Since feed air for the PCV is also post filter the surrounding ambient pressure will cause air to be drawn in through the hole for the PCV through the engine and into the induction tract,. In doing so it may very well suck in dirt and debris.
The engine is obviously in not bad condition as the surrounding area is clean and not covered in an oily mess as would be the case with an engine with moderate or even minor cylinder wear with the PCV missing or the air filter is badly plugged causing a significant reduction of pressure in the induction tract and creating a rather large flow through the missing PCV's hole.
I would not worry too much about it, the oil in the engine will grab all of the crud that was sucked in and it will be captured by the oil filter, the only issue could be is if the oil filter plugged up and it by-passed.
Thanks for your insights. I learn a lot from you guys - and I have a big learning curve since no one in my family ever worked on their cars. I find it fascinating what you all know and can do to your trucks.
Not sure what there is to respond to. Pretty straight forward.
I am not sure either. Your understanding of a PCV SYSTEM is something else.
As for the other reply stating that the open rocker cover may suck dirt in is not likely as the excessive crankcase pressure (as a result of the non-functional PCV SYSTEM) will expel crankcase fumes, not create a vacuum. The only dirt that may be ingested would be from a very dusty air condition and/or hard rain.
Going back to the original post (unless I'm missing something...)....
Based on the picture, the PCV valve has just been hanging out in space. The system from the PCV to the intake has been operating "normally" all this time if the valve is functional. All it does is create a metered vacuum "leak" that takes in "air" during particular vacuum situations. The PCV/Intake system doesn't care where this air came from.
The only thing that has NOT been happening is scavenging of the crank case vapors via the bung in the valve cover. This has probably caused zero problems with the motor.
Based on what I read, it appears that whomever replaced the valve cover gaskets forgot to put the valve back in place.
I am not sure either. Your understanding of a PCV SYSTEM is something else.
As for the other reply stating that the open rocker cover may suck dirt in is not likely as the excessive crankcase pressure (as a result of the non-functional PCV SYSTEM) will expel crankcase fumes, not create a vacuum. The only dirt that may be ingested would be from a very dusty air condition and/or hard rain.
Are you dense on purpose or does it come naturally? You apparently do not under the basic concepts of low-pressure do ya? You do you understand the concept that there is a low pressure BEHIND the air filter where the PCV is fed from or is this just too complicated? You do understand that this will create a low pressure compared to ambient in the crankcase on a sound engine then dawing air in the open PCV hole. Seems you are the ONLY one that can not grasp this.. You can't possibly be that dense naturally. But if you are I suggest you go back to school and graduate past grade idiot.
Last edited by ctubutis; Sep 10, 2019 at 10:24 PM.
Reason: dies = does
You play through. I need a good laugh now and then.
Have a good day ...
And you just keep trying with the google foo, instead of actually having a clue and giving correct and useful information that will actually help people solve and fix the issues with their trucks.
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