Hey there folks, I've been reading around and really cannot seem to get the FIRM answer on whether or not that deleting my EGR system would really benefit my truck.

I drive an 89 f150 with an i6 and a 5 speed manual. If and any comments and or any added knowledge would be greatly appreciated!

 

https://www.physicsforums.com/thread...r-loss.663150/

 

I deleted the EGR system on my 87 f.150 (351) and I haven't noticed a significant difference. It is a lot easier to work on now that you don't have vacuum lines running everywhere. However, if your state requires emission testing, I don't think you could delete the EGR.

 

First question is.. are we actually talking about the EGR system here or the air injection system? That second system is responsible for most of the mess under the hood of these trucks, the EGR system in comparison is just 1 tube and 1 vacuum line.

In both cases there are zero performance gains to be realized from removing either of these systems, but if the stock cats have been removed then the air injection system serves no purpose any more so you may as well delete the air pump and all the hoses and valves attached to it.

 

It's not worth repairing the air injection system, remove it if it breaks. EGR might be worth repairing if you do a lot of highway driving and have deep gears or no OD. Either way I wouldn't reinstall them if you wind up taking them off for whatever reason.

 

If you delete EGR, you may experience pinging under load as the EGR cools combustion temps and the timing advance curve is tuned to take advantage of this. Without the EGR, the increased combustion temps may cause pinging.

 

I didn't even think about the air injection system, thanks for the info on that too!

 

The air injection is needed to make the cats function...if they are heating to the proper temp, carbon will eventually build up and clog them up....the EGR is a "good thing" to have................

 

If you delete the EGR and do things to make the computer think it has a functional EGR system (like sticking a quarter under the threaded fitting in the exhaust manifold) then the computer may adjust timing to compensate for EGR it doesn't have and that may cause it to ping but in all likelihood the knock sensor would catch it and the computer would remove some advance and you'd keep driving like normal. The computer doesn't advance timing that much with EGR and when you're near WOT it doesn't use EGR at all, ever.

That said, most newer engines (modular family for example) are tuned with the expectation of EGR so there's a bigger fuel economy penalty if you get rid of it.

 

I would personally leave it there. That way you can pass emissions and register your truck. Eventually all states will have emission standards and testing.

 

It's a complete waste of time and energy, if your expecting a performance gain of any kind.

 

Guys, Don't confuse other cars and trucks emissions with your 90's ford. Why? Because the Computers in these vehicles are dumb. It would be a lot different playing around with something newer that has a lot more sensors to deal with and better computer logic, but for us 90's guys, you don't need to worry about running lean.

Take advice from those that have walked the line, not those that are talking about it.

Also, if you have a goverment with emissions standards, do something about your government.

 

There are infinite pages dedicated to an egr debate....I don't intend on participating in another one, so I'll keep it short and sweet.

No way no how does injecting inert gas improve performance or efficiency in any way. A computer going haywire due to absence, or malfunctioning, of emission components is the only cause of poor mpg with egr deletion. Egr reduces the combustion efficiency; by far the most important variable in the efficiency equation.