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Old 12-19-2011, 02:07 PM   #1
helistructor
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Default bypassing EGR

99 SL1 and I'd like to put a plate between the egr vallve and the gasket to bypass the valve all together. Leaving the vavle to function, just not bypassing any exhaust gas. Will this cause any check engine lights? I already have one because the dang thing needs to be cleaned once a year or so.

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Old 12-19-2011, 02:10 PM   #2
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Default Re: bypassing EGR

Quote:
Originally Posted by helistructor View Post
99 SL1 and I'd like to put a plate between the egr vallve and the gasket to bypass the valve all together. Leaving the vavle to function, just not bypassing any exhaust gas. Will this cause any check engine lights? I already have one because the dang thing needs to be cleaned once a year or so.

Thanks
Richpin has a video describing how to do this using a beer can. When I was testing various SMOG results I blocked the passage using this method to determine the affect on HC, CO (and obviously NO). I only ran it for about 20 miles. However, the pressure seemed to be starting to get the best of the aluminum as it was starting to bow from the pressure/heat.

-Robert

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Old 12-19-2011, 02:23 PM   #3
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Default Re: bypassing EGR

If you don't like replacing exhaust valves, I wouldn't advise blocking off the EGR.

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Old 12-19-2011, 02:33 PM   #4
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Default Re: bypassing EGR

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Originally Posted by colonelhogan44 View Post
If you don't like replacing exhaust valves, I wouldn't advise blocking off the EGR.
I'm just curious if blocking the EGR system, if it will cause adverse side effects. THought I'd ask on here before trial and error.

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Old 12-19-2011, 02:37 PM   #5
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Default Re: bypassing EGR

I used a piece of tin my dad used for flooring in the cab of his F150. I triple layered it as I couldn't get one layer to be flat and 3 seemed to do the trick. If your going to sandwich it under the EGR valve then you'll only need one layer. It got a pair of rather black circles, but showed no signs of burning after a couple months.

Something about the way it works though helps prevent cyl 4's valves from overheating.

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Old 12-19-2011, 06:41 PM   #6
postmortal1
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Default Re: bypassing EGR

Exhaust valve issue is false from my experience. I have a 91 SL2 with 250K on it and EGR has been blocked off for 210,000 + of those extremely hard miles.. And am currently driving 94 SW2 with EGR blocked off for around 50,000. I have heard of this valve burning issue but never saw it..
Now to your question of codes... YES you will have nothing but codes and then your cruise control won't work or other stuff associated with the OBDII system in your car.. I formally had a 97 SW2 for about a year and tired of the endless codes so I sold it.. This car i tried everything to bypass the egr even went as far as to vent it to atmosphere in an attempt to fool the computer into believing that the EGR was functioning.. NOPE can't trick it, as big brother decided to make sure you couldn't do that stuff with a 96 and newer car..
So yeah just clean your egr every 6 months or buy a new one with a warranty and exchange it. Better yet sell your car and buy a simple OBD1 car and do whatever YOU want with YOUR car...

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Old 12-19-2011, 07:36 PM   #7
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Default Re: bypassing EGR

If you do a good job cleaning it, it should last several years before needing to be cleaned again. Just blocking off the EGR won't burn your valves (in the short-term, at least), but leaving it unblocked will help prevent damage to the valves in the event of other problems. It also reduces emissions and improves gas mileage. There really isn't any reason to block it off (there is absolutely no performance benefit).

And yes, blocking it will set a check engine light if it's OBDII ('96 and newer).

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Old 12-19-2011, 08:19 PM   #8
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Default Re: bypassing EGR

I've never owned an OBD1 Saturn (Thank the Lord) but have owned 8 OBD2 saturns (in the family...5 personally) and I've cleaned an EGR valve at total of...wait for it... 3 times. And I live in the PRK...no problems yet.

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Old 12-19-2011, 09:03 PM   #9
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Default Re: bypassing EGR

The only reason to block it off is if its sticking open or if you are having issues and you want to isolate the EGR valve for testing.

-Robert

Quote:
Originally Posted by PlasticCarsRock View Post
If you do a good job cleaning it, it should last several years before needing to be cleaned again. Just blocking off the EGR won't burn your valves (in the short-term, at least), but leaving it unblocked will help prevent damage to the valves in the event of other problems. It also reduces emissions and improves gas mileage. There really isn't any reason to block it off (there is absolutely no performance benefit).

And yes, blocking it will set a check engine light if it's OBDII ('96 and newer).

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Old 12-20-2011, 06:11 AM   #10
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Default Re: bypassing EGR

What you can do to try and minimize the carbon build up is what's been tried by others with varying degrees of success; remove the egr valve and start the engine for a brief LOUD run as the exhaust an intake ports are open to pin the rpm at its rev limit while helping the exhaust system blow out any loose exhaust deposits. A partially warm engine may be better than a cold engine since the exposed intake port will allow the engine to run up to the built in rev limit. A minute or less is all that's needed to blow out the exhaust deposits. Then replace the egr valve. This should be good for a while depending on oil consumption/burning/blowby.

As mentioned, running with the egr valve ports blocked off hasn't accelerated any burned valves unless this was blamed on the egr ports blocked off when the engine already had lean fuel issues to begin with. If you feel the blowing out of the exhaust manifold won't help and blocking is needed, you can try carefully blocking either intake or exhaust port where this won't interfere with the egr valve pintle movement to seat completely. The egr valve has a position sensor that feeds back to the pcm so interfering with free movement with any blocking gasket can cause position errors. A semi permanent block should be sheet metal that won't melt as quickly as aluminum soda can material.

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Old 12-22-2011, 10:51 PM   #11
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Default Re: bypassing EGR

Does the egr valve have anything to do with oil consumption? I wouldn't think it does but......maybe a stupid question.....

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Old 12-22-2011, 11:23 PM   #12
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Default Re: bypassing EGR

^^^^^^ nope.

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