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I replaced that check valve this afternoon and took the truck for a short test drive. Started up fine, check engine light is gone, no black smoke, no hesitation, no stalling, everything seems normal. I'm hesitant to say it's fixed because I already thought that once, but it's looking good so far.
Still not fixed. Test drove again this morning and everything was fine, took it out again an hour ago and same deal all over again. First thing I did was look at the new check valve, which was already full of crud and allowing air to pass both ways. This is really getting frustrating.
I think I would rig up some filters until you find the source
Maybe some hoses are breaking down inside..What about a catch can on pcv system too as a preventive cleaner . I have debated adding one to mine to keep intake cleaner .Just a few thoughts .Take throttle body off and clean it and maf with the right stuff .That never hurts .. Consider pulling drivers valve cover off and clean baffle for pcv ,I would use brake cleaner and dawn . They want you to replace it but thats expensive . clean all the hoses or replace ,one to each valve cover .. I am not really sure where this check valve is at .
But if its on the evap system wouldn't it be pulling from the rear axle trying to burn vapors from carbon cannister . You should have some evap fail codes . Your solenoid or lines back there must be sucking in dirt ..You have a vent solenoid ,carbon canister and all kinds of lines to check sorry haven't worked on this system . The computer is supposed to pull a vac on tank every now and then and sensor in tank is supposed to signal okay its holding vacuum . The evap solenoid up front caused my wife's explorer to surge and run bad for a year before i finally built a smoke can and found that solenoid plastic all eat up from alcohol in gas ,damn thing was under battery and hidden .There is a vent solenoid back there on rear axle that is normally closed and only opened when computer wants to pull vapors off carbon can . Could that dirt be hoses rubber breaking down and leaking .Maybe your solenoid up front bad ???
What the hell do I know .
I did get a code for the evaporative emissions sensor, P0452. Although now rhe CEL is gone since I unhooked the battery for a while.
This is the check valve that keeps clogging, it feeds into that solenoid located on the firewall just behind the battery.
I started it up and unhooked that line to see what would happen and nothing changed. I could feel it pulling a good amount of vaccum but it's still running like crap and puffing black smoke. This is a video of the engine running right now:
It sounds like it could be a vacuum leak. Is that check valve part of the IWE system? Maybe you have a leaking IWE vacuum hose and it is pulling dirt in from your hubs. The other place to look is the evap solenoid. Maybe pull the hose from that and plug it and see if things improve.
That sure looks like your 4x4 solenoid. You have the old one that doesn't have the protective hood. There are three of those check valves between the brake booster and the 4x4 solenoid. Maybe not related to your black smoke issue, but test all of them and replace if not operating as a one way.
You guys are right, that solenoid is not what I thought it was. When I punched the part # in to Google the first thing that came up said evaporative emissions, but what I think I need to be looking at is the vapor canister purge valve. At least if I have any 4wd problems I'll know where to start looking.
Yes that must be check V in 4x4 system indicating 4x4 problems . The vacuum keeps it in 2wd drive, loss of vacuum is going to cause 4wd problems/spline grinding etc, handling problems, including gas mileage etc .Dirt in there is never going to be good . Like the other guys said there is a modification to keep water off IWE sol .I don't have 4wd .
Certainly your evap system must be in good shape . The evap solenoid is usually above brake booster and it has a green cap for testing . The rest of the circuit is around the rear axle and above tank . There is lots of videos on the system and it takes a lot of though to fix it . If the solenoid on vapor canister doesn't seal off or hoses bad things will run poorly . Lots of inspection and a smoke test is going to help . My friends van had a rolled gasket on fuel pump assembly going into the tank . It took months and 3 different runs of a different smoke machine and finally it was on a lift and he spotted it himself . It was a factory error .
A lot of the time it can just be the gas cap . But if this truck saw a bunch of off roading the mud and stuff could have damaged rear axle stuff .
I really appreciate all the advice. Vapor canister vent solenoid does not look good. I wonder if it was working at all. Could that cause all of my symptoms?
04-17-2019, 05:56 PM
