Removing emission equipment and getting rid of vacuum lines

[TJRick]

Have a 99 4.0 is there a diagram that explains how to get ride of vacuum lines I don’t live in a smog state and want them gone 4.0 is fuel injection

Sorry, I was just ribbing you a little, Chief.

The first thing you need to know is that it is illegal to do what you are proposing. The second thing is you aren't going to gain anything even if you did it.

That being said, the only way it is worthwhile to remove the emissions systems and associated vacuum lines is to go all the way and remove it all - including your entire electronic fuel injection system. Ever since the 1990s, these (and all other) engines have been controlled by an engine computer that relies on all of the electronic and vacuum inputs to not only operate the emissions systems, but also to adjust ignition timing and the air/fuel mixture. In other words, everything has to work together. If something malfunctions or goes missing, the engine computer is going to try to compensate for the "problem" and something else is going to suffer. This will only result in loss of power, fuel economy, and it will probably shorten the engine's life. It really isn't a good idea for any vehicle with an electronic fuel injection system. And believe it or not, these engines are about as basic as it comes to also have fuel injection. The newer engines today are twice as bad.

If you wish to go completely analog and install a carburetor, then you are after my own heart. But you can also plan on installing a mechanical fuel pump and replacing your entire ignition system to make it run right. And even that's not a good idea anymore because the quality of aftermarket parts these days is terrible.

I hope you make the right decision.

 

[hosejockey61]

To me the benefit of removing stuff (especially the charcoal canister) is to gain access for other things under the hood such as an ARB compressor or something like that.

 

[TJRick]

To me the benefit of removing stuff (especially the charcoal canister) is to gain access for other things under the hood such as an ARB compressor or something like that.

The charcoal canister doesn't cost any power to run, and it only helps.

Removing it will trip your check engine light. Do you just ignore yours?

 

[Rick Flair]

Lol.

 

[hosejockey61]

The charcoal canister doesn't cost any power to run, and it only helps.

Removing it will trip your check engine light. Do you just ignore yours?

I haven't removed any of my stuff....simply stating I would love to for the space I would gain.

 

[qslim]

Isn’t there a programmer you can get that defeats the evap logic? I thought I read about it in here somewhere, though I don’t see the point in doing so unless you’re trying to free up space under the hood like @hosejockey61 said. I personally don’t subscribe to the value of evap emissions for as complicated a system as it is, but that’s just me. Look at what’s happened to gas cans over the past decade.

 

[Rick Flair]

Isn’t there a programmer you can get that defeats the evap logic? I thought I read about it in here somewhere, though I don’t see the point in doing so unless you’re trying to free up space under the hood like @hosejockey61 said. I personally don’t subscribe to the value of evap emissions for as complicated a system as it is, but that’s just me. Look at what’s happened to gas cans over the past decade.

I’d honestly be shocked if there wasn’t. Diesel programmers do a A LOT more so...

 

[Chris]

Isn’t there a programmer you can get that defeats the evap logic?

HPTuners

 

[jesseshoots]

The charcoal canister doesn't cost any power to run, and it only helps.

Removing it will trip your check engine light. Do you just ignore yours?

It wont trip the light if you only remove the charcoal canister, keep the purge solenoid, and re-route the lines properly so it goes from tank to purge solenoid to intake manifold. It's just removing a filtration stage.

 

[Ty Tibs]

It wont trip the light if you only remove the charcoal canister, keep the purge solenoid, and re-route the lines properly so it goes from tank to purge solenoid to intake manifold. It's just removing a filtration stage.

Hey question… how did this hold up?? I did this earlier and didn’t throw a code, seemed to drive fine. I left the vent line open that went from the charcoal cylinder to the leak detector (originally made in CA jeep) because it seems to not be part of any vacuum. Other than that I did exactly what you said, tank vent line to purge solenoid, to manifold.

 

[jesseshoots]

Hey question… how did this hold up?? I did this earlier and didn’t throw a code, seemed to drive fine. I left the vent line open that went from the charcoal cylinder to the leak detector (originally made in CA jeep) because it seems to not be part of any vacuum. Other than that I did exactly what you said, tank vent line to purge solenoid, to manifold.

Still no codes and works fine. I don’t have a leak detector on mine though so your results may differ.

 

[Soopahicks]

Still no codes and works fine. I don’t have a leak detector on mine though so your results may differ.

Sorry to revive this again, but do you happen to have a picture of how you routed those lines?

 

[Tibol Express]

Sorry to revive this again, but do you happen to have a picture of how you routed those lines?

bringing this dead horse back to life, did you ever take a picture? lol I'm planning on doing the same. Maybe there'll be an answer a year from now lolol

 

[LONGJP2]

bringing this dead horse back to life, did you ever take a picture? lol I'm planning on doing the same. Maybe there'll be an answer a year from now lolol

Not sure if @jesseshoots is still around.

 

[cb4017]

I'm sure there is somewhere, but you are aware that removing emissions is against the law in ALL 50 states and that any LEO could have your vehicle impounded?

I'll add this little tidbit.
As a retired 25 year LEO, the LAST thing I would be concerned with is whether or not someone's vehicle met federal emissions standards.