I've searched on here several times and haven't come up with an exact answer, so I'll ask. The egr valve went bad in my car, so I had Ion @ Madz28 send me a computer (it was an excuse to get the tune ) with the egr programmed out. I'm finally getting around to installing my headers this weekend and had intentions of blocking off the air and egr. They are emissions legal Hooker shorties. I've decided against blocking off the air even though I'm replacing the cat with a dynomax bullet muffler. Will there be any problem with this? Also, how exactly can I disable the egr system without removing it. I wanna be able to put it back stock fairly easy. I've already got the blockoff plates from SJM, so if they need to be used somewhere else I've got them here. Thanks!

 

You could "disable" it simply by plugging up the vacuum line to the solenoid. Cap the hole on the back of the intake manifold where the corrugated riser tube attaches. On your 95, its possible that it will not set a code.

I guess my question would be, since you don't want to physically remove it, why do you want to disable it? As long as the EGR valve is in good condition, the system has no affect on performance, and in some cases, like lugging the engine at low RPM in the wrong gear, it can actually reduce the probability of detonation.

 

I can only imagine how much you hate egr related questions, I've searched on here enough to see how much you reply! The egr valve on the car was setting a code, but wasn't affecting performance till the check engine light came on. I know when the check engine light comes on, it goes into "limp home" mode.

Basically, I'm wondering since it's already programmed out, if it is bad, is there any way it could hurt performance? I know there's no gain in taking it off, and it's alot of trouble I'm trying to avoid. Is it gonna hurt anything leaving it just like it is with it programmed out or do I need to block it off?

 

If the EGR valve is sealing ok, removing the vacuum supply is the same as removing the valve and installing a block off plate. With no vacuum, the valve can't open. Like Injuneer said, cap the vacuum port that feeds the solenoid. It is on the side of the intake manifold in the middle.

 

Thanks alot for the help, that seems alot easier than taking everything off.

 

Make sure you cap that line.

 

Not really. When a sensor fails, the PCM alters the way it operates, to compensate for the missing data input. When an actuator device like the EGR fails, there isn't much the PCM has to do about it.... might just stop trying to activate it, and assume its closed.

"Limp home" mode is a last gasp effort to keep the engine running, with virtually no input data at all. I doubt most people ever experience true "limp home" mode, and it definitely is not used in response to every SES light.

 

all I was saying on the limp home mode is that I notice a big difference in power with the check engine light on. That's why I got it programmed out, the egr valve wasn't affecting anything, it was the check engine light that made it run bad.

Anyhow, on that vacuum port on the intake, what size cap does it need? I don't feel like buying every size they have since I know someone on here knows....also how to I block off the line going to the egr system from the intake? I'm assuming that it needs to be closed too.

 

You might just pull the vacuum line off and take it into the auto parts store to get the right vacuum cap... probably about 1/8".
Do you mean the tube that runs from #8 manifold runner to the rear of the intake manifold? See earlier post:
You can make your own block-off plate by simply taking the flange off the end of the corrugated tube and using it to hold a diamond-shaped piece of sheet metal against the opening, or weld the hole closed in the flange off the tube and bolt it to the intake, or buy a blanking plate from SJM Manufacturing.

http://www.mycamaroz28.homestead.com/

 

Sorry about that, it was a little difficult to understand......I was talking about the vacuum port on the driver's side of the intake. When I cap it, do I need to cap the line that came off it too?

 

You need to cap the nipple on the driver's side of the intake manifold. That's all. Pull the hose off, that runs from the nipple on the intake manifold to the EGR vacuum solenoid, take it to the parts store and get a vacuum cap to match the connection on the intake manifold.... about 1/8" diameter.

Courtesy of Shoebox:

http://shbox.com/1/opti_vacuum_conn.jpg

 

Gotcha, that's what I was trying to figure out....if I had to cap the line the same as capping the hole on the intake. Thanks alot for all the help!

 

I just used part of an old pop can that was cut up to block the corrugated yube goping into teh intake. It was easy after i figured out to bend it a lil so it hooked over the top and dindt fall as i tried to bolt it to the intake.

Now with that blocked and no exaust being able to get in, do i still have to disable the EGR valve? I figured since it had no feed i can leave it alone. I have a 95 nad also had it reprogrammed to remove AIR and EGR. So i have to cap the EGR nipple and the nipple on the intake? Then i can just leave the solenoid alone or just remove it totally?

 

I probaly missed the answer(sorry), but can you just program out the po400 egr code and do nothing at all ? Leave things where they are??

 

It's my understanding that if you block off the egr port on the driver' side of the intake shown here http://shbox.com/1/opti_vacuum_conn.jpg that it disables the vacuum going to the egr valve. When I put my headers on this weekend, I'm gonna block off the corrugated tube since I already have block off plates. I've been driving mine around since December (not a daily driver though) with no problems at all just programming it out, so I know it's possible on an OBD-1 car unless your egr is really screwed up. I'm not sure what it'll do if there's no exhaust going in with the vacuum still attached. It seems like it'd still try to open the valve from what I've read from the previous posts. I guess I'll find out Saturday how it all works out!