I'm getting ready to delete the smog pump off my TPI 305. I know exactly how to do it, and what belt i need. The question is, will deleting the smog pump make the service engine light come on?

 

No.

 

I'll second the No vote as I just took all mine out a couple days ago.


hahaha AJ_92RS, your sig pic is awesome.

 

Absolutely not.

Unless you need it to pass smog inspection, yank it all out without hesitation!

Lose the AIR tubes, too. No more cut arms from simply changing plugs.

 

i got code 32 a week after deleting smog pump, cats, and did full exhaust. i think my egr was most likely going bad and it just happen alittle after one of my few highway cruises.

 

Actually, I've gotten that a few times.

A couple of times was right after I did it. Unhooked the batt. for a while, then it came back probably 2 more times. Then that was it.

Then I changed the cat. Did it again. Unhooked batt.......

Then, of all things, I changed to 3-1/2" tips and what do you know...... it happened again.

Evidently the ECM is sensative to any changes in the exhaust flow and blames it on the EGR. "It was HIM!!!"

 

Abird,
You MAY get some crazy effect like this, but I doubt it. LOTS of people do this mod and its nothing but good. If the code comes up, just reset the ECM and keep going. It shouldnt cause limp home or anything like that. I suggest you get someone to burn you a new chip with EGR disabled and ditch it too. That'll prevent the code from ever happening.

What I'm saying is, don't get discouraged from doing this mod! You'll like it better without all that crap.

 

Not to sound too critical, but that's not good advise.

There's nothing anti-performance about the EGR. It's a very good thing.

Kind of like PCV.

It wasn't put there to hinder performance as everyone thinks. Both were developed to improve efficiency and help reduce emissions output, without intruding on performance at all.

 

I'm not a expert engine builder, altho I have built a handful, but EGR is all anti-performance IMO. How can exhaust gasses possibly not hinder performance??? One it's hot air and two it's oxygen content is fractional to that of fresh air. I've heard and read the arguement on here that it keeps cylinder temps down which actually helps with performance... if you have problems running your motor at proper operating temps an EGR isn't the way to solve that problem. A proper cooling system is what'll give you best motor temps. The EGR vavle is not part of the cooling system. It's part of the emissions system.

 

Because your opinion tells you something is true doesn't make it true. IMO, I should be a millionaire, but I'm not.

I don't know who told you it "keeps cylinder temps down" but it doesn't. It slows the burn rate. (Kind of like what high octane gas does )

THAT is what keeps the temp down. This allows the engine to run on a slightly leaner mixture at cruise speeds without detonation. That also allows the timing to be advanced a little further to increase output (efficiency & MPG).

The EGR only operates primarily at cruise speeds. It does not work at idle nor WOT, which would be were your foot is if you're concerned about performance.

 

Well I said in my opinion cause I was opening the subject for debate

Slowing the burn rate and advancing the timing are of course great benefits. The EGR is still recirculating unburnable gasses into the combustion chambers where oxygen could be present instead tho. Why exactly is it slowing the burn rate? Is it because of the decreased volume of fresh air? I'm still just confused as to how an EGR valve is beneficial over a properly setup motor(cooling, timing, etc.).

 

I'm not saying I know anything, but I don't like the idea of exhaust gasses taking up the space oxygen could be in. Seems to me like it would hurt performance. I know, it's not used at WOT, but there are a lot of times when you can't put your foot all the way down but still want to get up, especially if you have a lot of power and don't feel like leaving a lot of tread or being left behind. However it works to reduce temps, I agree that it should be the job of the cooling system, not the EGR, to take care of that.

I'm not an expert on the matter, but I don't see how it increases efficiency. If this "increase in efficiency" is from the "cooler temps" it causes, then again, I'd take a good cooling system. Logic tells me that replacing oxygen with exhaust equals less efficiency/performance.

I'm guessing that the major function of EGR is reducing emissions, like we've thought all along, and that whatever effects it has on temps or efficiency are more or less just side effects of trying to reduce emissions, and they're promoted as functions of the EGR to encourage us to keep it so we'll reduce emissions.

I've got no qualms about taking my EGR out, and if it will prevent stupid side-effect codes of working with the exhaust and allows me to fit more oxygen in the cylinder, I'll take that over whatever temperature and efficiency effects people say it has any day of the week.

Again, I'm not an expert on this whatsoever, this is just my take, and if it works for me and a lot of other guys, it should work for you too. One less thing to worry about screwing up.

 

The purpose of the EGR is to reduce emissions. That's true. But one thing you're not realizing is HOW.

In order to reduce emissions they (the manufactures) have to do something to either increase efficiency, or add a device (like a cat) to somehow reduce polution.

Guess what the EGR does? Increases efficiency. How? By slowing the combustion of the GAS!!!

Adding a better cooling system does not produce the same results. They are two totally different things.

Take off the EGR if you like. There's no law against it.

OH WAIT!!! Yes there is. But heck, it's only a $25,000 fine. Chump change right? After all, that's a small price to pay to reduce the efficiency of the engine and NOT increase performance, right?

Before you say "We don't have tests where I live", it doesn't matter. It's a federal offense. The feds can nail you anywhere at anytime.

 

Good lord, I didn't know we had an EPA cop in here. For real, you just turned a friendly debate into a McCarthy hearing.

Really, do you know anybody who's ever been fined on the spot for anything emissions-related? And what cop can recognize our specific application's EGR and would notice if it wasn't enabled? Especially if its in the chip! Impossible.

Not to mention that if you take off ONE emissions device, you might as well take them all off if you're concerned about a fine that'll never happen. Considering that the guy we're giving this advice to is going to remove his entire smog/AIR system, it makes no difference to disable the EGR, from a legal perspective.

Like I said, I'm not an expert on EGR and how it works. But lots of people get rid of it, and the effects are minimal. It prevents EGR system failure from screwing stuff up, throwing codes, etc, and its less clutter to worry about. That's all I was trying to say and he can make the choice.

 

since taking my smog pump off a week ago my car runs significantly better. Especially when its cold now whereas it was burping and gurling a bit till it warmed up before in the morning.

 

You totally missed my point.

I don't give 2 shakes of a hooker's butt about the EPA. My point is..... you're going to be removing something that HELPS the engine run more efficiently, therefore getting better MPG, and it doesn't cost you anything in performance.

What I'm saying is that some of you would rather risk getting that fine (and yes the chances are slim-to-none), to remove something, that by doing so, would not improve performance AT ALL, and possibly hinder it.

At this point you probably think I'm an idiot.

You are correct.

I'm an idiot for spending this much time trying to convince you that it actually helps performance and economy when obviously you've convinced yourself it turns your car into a top fueler by removing it.

Shame on me.

 

all I have to say is hahahahaha. This wouldn't be an internet thread if it didn't end like this anyway AJ.

 

You're right. I was really disappointed when I removed my EGR and I didn't shave off 8 seconds in the quarter mile. In fact, it didn't have any effect at all! Weird.....

 

I was under the impression that removing the EGR reduced efficiency because the car was tuned to take the EGR into account. If it was tuned for no EGR, wouldn't it end up being at least as effecient?

I don't know what makes for more effeciency or not. High octanes are supposed to be less effecient aren't they? (Aren't you supposed to use the lowest octane gas you can without causing pinging?) So if that's the case, wouldn't the EGR be reducing effeciency?

But then... if it allows you to advance the timing to get more perfomance from the engine, I guess I can see that overcoming the reduced effenciency of the burning gas. (My terms may be incorrect, but hopefully I get my point across.)

Assuming the slower burn and advanced timing and leaner mixture is more effecient while cruising, it seems to me the EGR has the effect of almost varying the octane of the gas. (I mean, the same effect could be achieved if say, a higher octane gas was used from a second tank or something. )

Am I really even making any sense? LOL