But thinking a bit more, he probably means the plastic baffling piece that fits in the hole in the valve cover. That needs to be removed when you add the PCV valve.

 

Valve Cover Side = Should be open hole with no OEM plastic baffle
Intake Side = V288/FV308 PCV

If you install the V288/FV308 PCV and leave the OEM plastic baffle in the valve cover you are totally defeating the purpose of the upgraded PCV because the OEM baffle in the valve cover will clog and then crankcase pressure will build up causing oil leaks.

 

...thanks BEST ...yes, I understand your recommendation, but the issue at hand is troubleshooting a persistent P0305 code, even after swapping corresponding plug and wire. When the upper intake was removed I uploaded a video showing the area for all to see and let me know if anything shown may need further attention -not necessarily in relation to code. I pointed out how dirty it was around the valve covers and the 4 closest intake holes to front -clearly seen on pic and video, so EXTINCT asked if I had the PCV MOD done. I told him that I was not aware, but since I had the Disco, the plastic nipple on upper intake mentioned in the MOD has been replaced with a metal one by a previous owner, but not sure if it is the recommended PVC. As per the plastic baffle, I personally replaced the valve cover gaskets once, and recall pulling it out and replaced it with a new one -I was not aware of this MOD then. A couple years back the gaskets were replaced by a mechanic, so not sure if he removed it then, but I don't think he would without me asking or him telling me, but who knows. Thing is that I was not aware of the MOD until EXTINCT mentioned it; I know the nipple is a metal one, but unsure if it is the PCV recommended; and I'm thinking the baffle is still there, for sure. Since I have to go back to swap coils to keep troubleshooting P0305, I'll take a closer look at nipple to confirm which is it, and if the baffle is there, and decide next steps, perhaps in a new post. Thanks again!

​

 

... correct, this issue came up after I pointed out how dirty it was around valve covers and 4 closest intakes to front. I need some looking to do when I go back to swap coils and keep troubleshooting P0305 code, which is the more pressing issue now. Thanks for your feedback, greatly appreciated.

 

My guess is that the nipple threaded into the intake on your truck is not a PCV valve. When I broke the plastic version on my truck many years ago I replaced it with a brass version from the plumbing department at The Home Depot. I think that's more likely what is in your truck, but as you say the P0305 misfire is the more immediate issue.

 

... agreed, but I'll double check since I need to get back in there, thanks MLN01 ;-]#

 

Hello Roverers! ...a quick update to let ya'll know that I should be doing the coil swap this Saturday to keep troubleshooting the persistent P0305 code.
Disco still runs rough and shaky (sometimes more than others) but usually during startups, while stopped at a light, or when stepping on the pedal while driving; you can also feel the loss of power when trying to accelerate; SES light still flashes, but I feel is keeping more solid this past week. P0305 comes on as "logged" immediately after clearing codes.
I'll also check if the "plastic baffle" is still in passenger valve cover and get better pics of metal nipple in intake, since this question came up in this thread as well ...'till then! ;-]#

 

..:: UPDATE ::..

Hello Roverers! ...finally got up this morning to swap the coils to keep troubleshooting, and again opted for the long proven method of removing the upper intake (I kinda like this method more every time). Did have some hiccups trying to align the upper intake back in, but got it done at the end.

A couple issues did surface along the way though: broke the tab in one of the connectors as I was removing it, hopefully it will hold in place without it (see pics below)...


Connector with broken tab.


Where connector plugs in to.

Additionally confirmed that the "plastic baffle" was still in place, but when removing the hose to check, the tip of the baffle broke off. Also, metal nipple on other end definitely is not the one that BEST4x4 suggests, so I'll deal with this MOD at later date. See pics below...


Broken tip of plastic baffle.


Metal nipple in upper intake, installed by any of the previous owners.

Now back to issue at hand. After coil swap and everything put back together, Disco started fine, and let it run for a while until I gathered and put away all tools. No SES light yet. Got in the truck, revved it up a couple of times and no SES light yet, but I did feel it slightly rough and shaky, so I knew it would throw codes anytime. So drove off nice and easy for a couple blocks, but when able to step on the pedal I did and SES light started flashing until solid again; turned the corner with it still solid, flashed a couple times again, then it stayed solid; so back to same issue between solid and flashing. Besides the usual shakiness and slight roughness, I did not feel anything else worth reporting. Checked the codes and P0305 is back as LOGGED along with new P1319. Under PENDING I also see P0305 and P0300.

So P0305 persists despite plug, wire and coil swap, along with newly P1319. Keep in mind that since I disconnected the battery to do the swap, all codes cleared themselves, but let me know if I should clear them again next time I drive it, just to be safe.

In the past I've experienced some logged codes clearing themselves after driving for a while; hopefully that P1319 is one of those, since it is the first time I see it pop up. But again, P0305 is the persistent one, and the main reason of this thread.

I'll await your feedback, and next steps, thanks.

 

Can't remember if you tested the compression on #5 but that is the next step. I sort of doubt it will come up low because the miss you describe sounds like a dead miss and it would be there as soon as you started it, not after running a little bit. If it is low the next step is to take that valve cover off and make sure the valve train is in good shape. When you test the compression take a picture of the plug and post here. The only other thing I can think it could be would be a bad injector on that cylinder (or the wiring) and you can test that by swapping the injector with another one.

 

...no I haven't checked compression on any of the cyls, nor I know how to do so, so will need to get some guidance. As per the misfire coming up, it did not come up until I drove a couple blocks and was able to step on it; that's when it usually had surfaced after each of the swaps done. Jumping to next suggested step if compression is low, what do you mean by "making sure valve train is in good shape", what should I be looking for that would jump out as not being in "good shape"? As per testing the inyector, we'll cross that bridge when we get there. Any feedback on the new P1319 code? it logged along the P0305. I also took a video today, and there's a loud hissing sound that I wonder where it may be from, I'll add a link later.

Thanks again for your help troubleshooting this issue. ;-]#