Evaporative Emission System

Sorry to hear your having an issue. I have almost 3500 on my WT and no issues yet. Hopefully you’ll figure it out soon. All of this new technology seems like the bugs need working out. 🐎

It could be any number of things. Purge valve could have died, could be a leaky fuel filler seal, could be a leaky hose somewhere. Or it could be a faulty sensor that monitors this whole thing.

If you have an OBD-II code reader or Forscan you can plug it in and read the DTC code. If you do and post the code, I can tell you where to go from there. (Or obviously you can just take it to a dealer.)

RagnarKon

It could be any number of things. Purge valve could have died, could be a leaky fuel filler seal, could be a leaky hose somewhere. Or it could be a faulty sensor that monitors this whole thing.

If you have an OBD-II code reader or Forscan you can plug it in and read the DTC code. If you do and post the code, I can tell you where to go from there. (Or obviously you can just take it to a dealer.)

Sorry, I don't have the OBD II or Forscan. I'll probably look into getting both now. Didn't know if this is a common occurrence with an easy fix. Dealer appointments are at least 2 weeks out and really didn't want to wait that long. Thanks for the reply.

MK Ultra

Sorry, I don't have the OBD II or Forscan. I'll probably look into getting both now. Didn't know if this is a common occurrence with an easy fix. Dealer appointments are at least 2 weeks out and really didn't want to wait that long. Thanks for the reply.

You can still drive the Bronco with that issue, so no worries if you have to wait a few weeks.

Evaporative Emission Control systems (aka: EVAP systems) is just an emissions control device. Essentially it just takes the fuel vapors from your fuel tank (and elsewhere in the engine) and burns those vapors so they don't leak into the atmosphere. You won't pass an emissions test as long as you have that issue, but otherwise it's relatively low risk.

Usually the fix is to check to ensure the EVAP purge valve is working as intended. If it is, it's probably a leak elsewhere in the system. The fix for that is to smoke test the EVAP system using smoke machine. That smoke machine generates heavily rolling smoke, usually by aerosolizing mineral oil. Once you find the leak, figure out how to seal it. 👍

If it's neither of those things, then it's typically a sensor. BUT the good news is vehicles are basically computers with wheels, and they make it very easy to diagnose the issue (as long as you have the proper equipment to actually do it). The downside with EVAP issues is there can be multiple leaks and you won't know it until the check engine light comes back on. And sometimes it's practically impossible to find the leak because it is so minor. So you're sitting as an auto technician there wondering if the sensor is bad or if there is actually a very minor leak you just can't find.

MK Ultra

Sorry, I don't have the OBD II or Forscan. I'll probably look into getting both now. Didn't know if this is a common occurrence with an easy fix. Dealer appointments are at least 2 weeks out and really didn't want to wait that long. Thanks for the reply.

I hope that you get it figured out. I like your profile pic (‘99 grad here).

RagnarKon

You can still drive the Bronco with that issue, so no worries if you have to wait a few weeks.

Evaporative Emission Control systems (aka: EVAP systems) is just an emissions control device. Essentially it just takes the fuel vapors from your fuel tank (and elsewhere in the engine) and burns those vapors so they don't leak into the atmosphere. You won't pass an emissions test as long as you have that issue, but otherwise it's relatively low risk.

Usually the fix is to check to ensure the EVAP purge valve is working as intended. If it is, it's probably a leak elsewhere in the system. The fix for that is to smoke test the EVAP system using smoke machine. That smoke machine generates heavily rolling smoke, usually by aerosolizing mineral oil. Once you find the leak, figure out how to seal it. 👍

If it's neither of those things, then it's typically a sensor. BUT the good news is vehicles are basically computers with wheels, and they make it very easy to diagnose the issue (as long as you have the proper equipment to actually do it). The downside with EVAP issues is there can be multiple leaks and you won't know it until the check engine light comes back on. And sometimes it's practically impossible to find the leak because it is so minor. So you're sitting as an auto technician there wondering if the sensor is bad or if there is actually a very minor leak you just can't find.

Right on. It's still under warranty, so I'll take it over to Ford in a few weeks but will invest in an OBD II in the meantime. It just looks kinda janky driving around a new ride with a check engine light. Luckily I don't live in an area that requires a smog check. Cheers 🍻

Gyoja

I hope that you get it figured out. I like your profile pic (‘99 grad here).

Thanks, brother. 2003 grad, still in the game. It was all at Eglin by then, which was nicer than Indian Head!

MK Ultra

Thanks, brother. 2003 grad, still in the game. It was all at Eglin by then, which was nicer than Indian Head!

My class was all Eglin as well. We were tasked with setting up some of the ranges in the ground/air divisions as the equipment came in.

So I wanted to post a PSA.

There are two modes to a check engine light (called a MIL - malfunction indicator light in automotive engineering lingo). A constant light means it is safe to drive. A flashing MIL means there is a malfunction with the spark or fuel system and engine damage can occur. OBDII stands for On-board Diagnostics Ver.2. It was mandated by the US DOT beginning for MY 1996 automobiles.

OP, while you are waiting for an appointment, you can take your Bronco to most any of the big box automotive parts retailers and they will check the OBDII codes for free. Also, please note that there are OBDII codes that trigger the MIL. These OBDII codes are standard throughout the industry and mandated by Federal emissions regulations. OBDII codes report only emissions systems related malfunctions. The manufacturer, in this case Ford, will have manufacturer-specific MIL codes that translate to the standard OBDII code scheme and will also have Ford-specific codes for other systems of the vehicle, which the standardized OBDII system does not report but do not illuminate the check engine light (MIL).

I haven't had this on my Bronco, but I did have this issue on my Focus. For the fuel funnel trick, you should apply some fuel system cleaner to the outside of the funnel, and insert multiple times, wiping off any gunk that it picks up (this didn't work in my case). On the focus the purge canister was a fairly easy replacement, just a couple of clips and small screws to hold it in place. Since yours is still under warranty, it should be a quick fix when you get in for the appointment. As others have mentioned it's an emissions system and safe to drive until then.

I'm having the same issue. OP what were your codes and what was the issue? I have several codes. P0141, 0135, 2418, 0446, 0443, 0010, 0013 and I blew the 30a fuel pump fuse.

fresh coast

I'm having the same issue. OP what were your codes and what was the issue? I have several codes. P0141, 0135, 2418, 0446, 0443, 0010, 0013 and I blew the 30a fuel pump fuse.

I never checked the codes on mine. As it turned out, I topped off the tank and put too much fuel in. The issue went away on its own after putting about 100 miles on it.

Yeah this is why when it clicks off don't try to squeeze in every last drop. If you keep doing it, it will cause parts to be replaced. Glad it was that simple for you. Mine has now been at the dealer for a couple hours so hopefully I have some kinda answer as to why by night fall. I know a tech is looking at it at the moment