Every Cylinder Misfiring, Nobody can tell me why
Recovery Vehicle
Joined: Jul 2013
Posts: 822
Likes: 133
From: Collins, Missouri
How old is the PCV ? I have read stories of those opening up letting too much oil in and fouling the plugs and clogging up causing a build up of crankcase pressure causing reverse ring blow by.
Seems like a long shot but it seems you have covered everything else.
Jeff
Seems like a long shot but it seems you have covered everything else.
Jeff
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Mudding
Joined: Feb 2019
Posts: 109
Likes: 16
Don't know if it would cause the misfires but based on the oil on the throttle body, did you swap in a new PCV valve? 5 min and less than $50. Theoretically it could cause a vacuum leak and definitely would make your throttle body and manifold dirty by letting oil get in.
Any water get into the passenger side? Maybe some corrosion on the CJB or the wire looms under the passenger sill?
Any water get into the passenger side? Maybe some corrosion on the CJB or the wire looms under the passenger sill?
Although, yes... There is some significant water ingress on the passenger side. Such that after a heavy prolonged rain, when you open the door water pours out of the passenger side. I have tried to find the source of that, all the usual places and even sitting in the truck for an hour during the heaviest portion of a rainstorm, constantly inspecting the usual places and checking the door seals, fuse box, sunroof, etc... Note, I only realized this was a problem after the vehicle has been parked for a while.
I'll start tearing into that this week and see if I can make sense of anything. I had this issue with my other vehicle, but it only caused some intermittent key remote issues and random car alarms. Go figure.
Last edited by Identamerican; Jun 21, 2022 at 10:34 PM.
Rock Crawling
Joined: Apr 2018
Posts: 255
Likes: 31
I see you "cleaned" the EGR valve... have you ever replaced it? I had misfire issues with my 4.0L V6 and completely cleared up after replacing it with new. Same on my old Chevy pickup. They do need replacing at some point as part of maintenance. Just my .02 worth...
Recovery Vehicle
Joined: Jul 2013
Posts: 822
Likes: 133
From: Collins, Missouri
OK, have you verified the voltage to each of the injectors, and are all of them working? Like the coils packs you could try swapping them around is se what happens. Then, you can remove the injectors and test them to see if they have a good spray pattern?
If you have determined that the spark coils are good, the plugs are not oil fouled, the fuel pressure is good, the throttle body is clean, you may be down to the injector not consistently delivering the fuel.
Keep us informed of your progress, were not ready to give up yet.
General Disclaimer: I could be wrong.
Jeff
If you have determined that the spark coils are good, the plugs are not oil fouled, the fuel pressure is good, the throttle body is clean, you may be down to the injector not consistently delivering the fuel.
Keep us informed of your progress, were not ready to give up yet.
General Disclaimer: I could be wrong.
Jeff
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