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post #1 of (permalink) Old 12-26-2001, 08:23 AM Thread Starter
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EGR valve causes rough idle???

I have gotten my Weber tuned in and it is really running great. Now I have some questions regarding the EGR valve. I have my EGR hooked up to a vacuum source through the CTO sensor. This means that the EGR only gets vacuum once the coolant has warmed up. With the engine warm and the EGR activated my idle quality is significantly worse. I can make the engine purr with the EGR disconnected, but with it connected it stutters and actually need the idle screw turned in to maintain 700 rpms.

I would like to have a properly functioning EGR and a smooth running engine. Is this possible with the Weber/CTO setup? Is my EGR valve bad? Should I tune the Weber with the EGR active?

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Tom


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post #2 of (permalink) Old 12-26-2001, 10:04 AM
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Re: EGR valve causes rough idle???

I disconnected mine because I was having the same problem, getting it to idle right with the EGR.

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post #3 of (permalink) Old 12-26-2001, 10:38 AM
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Re: EGR valve causes rough idle???

Is your EGR valve any good? Maybe the diaphragm is ruptured causing a vacuum leak when it is connected. I had that problem on my 83 AMC Concord.

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post #4 of (permalink) Old 12-26-2001, 10:41 AM
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Re: EGR valve causes rough idle???

I suggest you just disconnect the EGR. It is only supposed to kick in when you are driving at a cruising speed, not idling. It dumps exhaust into your intake .. which lowers combustion temperate and reduces your NOx levels a little bit, but it doesn't lower your hydrocarbon or CO levels. I have mine hooked up to a fake vacuum line so it will still get passed at the inspection station.

but if you DO want to have it working, make sure it is on ported vacuum, not manifold vacuum.
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post #5 of (permalink) Old 12-26-2001, 11:23 AM
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Re: EGR valve causes rough idle???

I just disconnected mine . Put a fake plugged line on if the feds look at it .



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post #6 of (permalink) Old 12-26-2001, 11:29 AM
 
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Re: EGR valve causes rough idle???

You've most likely got it hooked to manifold vacuum, it should be on PORTED vacuum. Check and see if it's got vacuum at idle, I bet it does. The ported vacuum source will only supply vacuum when the throttle is opened up, thus deactivating the EGR valve (and vapor consister purge) at idle.
Don't know where the ported vacuum connection is on a weber, but if you find it, and hook that line up to it, you'll be set.
I'd advice against disconnecting it if you have an emmisions test, you'll probably fail on NOx without it, and it won't affect the way the engine runs if it's working properly.

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