5.4 V8 Misfiring AGAIN!
And update: Cleaned the MAF, nothing happened. Started poking around in the engine and here's what I found:
Right side near my oil intake. That hole is threaded yet the fitting isn't Doesn't smell like oil but I don't know what's coming out of there The hose leads to the back follows the firewall to the center of the engine then comes back towards the engine

Then on #4 spark plug the one my mech said he couldn't get out, I found this:



I have not taken it out yet. What do you think?
Right side near my oil intake. That hole is threaded yet the fitting isn't Doesn't smell like oil but I don't know what's coming out of there The hose leads to the back follows the firewall to the center of the engine then comes back towards the engine

Then on #4 spark plug the one my mech said he couldn't get out, I found this:



I have not taken it out yet. What do you think?
Last edited by munoxide; Feb 4, 2011 at 06:18 PM.
The hole on top of the valve cover on the passenger side is threaded? The PCV valve on the end of the hose is supposed to just push into that hole...
Alright, are you sure you're plugging the PCV valve into the passenger side valve cover? It doesn't go into that hole with the spark plug in it.
Right, I understand that. Those holes are meant for the COPS. Here's a photo of what I was talking about:

I don't see them going at an angle, so maybe it's not threaded. But what's preventing that from simply popping out?

I don't see them going at an angle, so maybe it's not threaded. But what's preventing that from simply popping out?
Yes, thats the PCV valve hole...It should just push right into there without popping out. If it keeps popping out, it might be routed wrong with something going underneath it causing it to pop back out when you put it in...
The PCV valve itself pushes into that hole. Its the little piece on the end of that hose with the foam around it. It clinks when you shake it up and down....
I dont need anymore photos, i got ya. Here is the piece that just pushes down into that hole, the PCV valve. I circled in red the part that goes down into the hole. The other ribbed part on it is where it connects to that hose with the foam around it.
Well I think it's fixed. I replaced the bad COPS with new ones and plugged back in the PCV valve. I didn't see any rubber around where you plug it into the cover. It was just metal on metal.
It ran like crap for about 20 seconds, motor shaking, etc. I tapped the gas lightly and it started to even out, ran for about a minute and no CEL, no shaking. So far so good. I'm iced into the garage about 5 inches outside the door, so I can't get it over that hump, but I'm excited about a road test to see if the truck runs great again. I will post with updated and thank you all for your help!
It ran like crap for about 20 seconds, motor shaking, etc. I tapped the gas lightly and it started to even out, ran for about a minute and no CEL, no shaking. So far so good. I'm iced into the garage about 5 inches outside the door, so I can't get it over that hump, but I'm excited about a road test to see if the truck runs great again. I will post with updated and thank you all for your help!


