LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Quick EGR Question

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Old Feb 20, 2007 | 06:43 PM
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Default Quick EGR Question

Well I have discovered that my egr has been disconnected for who knows how long and I reconnected everything today with a new hoses and egr solenoid. My question is this off idle my car still has alittle hesitation and wont spin the tires over until the upper rpm range. I checked vaccum at the intake to solenoid and it held vaccum but when I connected the pump to the the egr diapham and supply vaccum the engine doesnt hesitate and it wont hold vaccum. Does this mean that my diapham is cracked?
Thanks for the help
-Brandon
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Old Feb 20, 2007 | 07:03 PM
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Check out Shoebox's site lots of good info.

http://shbox.com/1/4th_gen_EGR.html
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Old Feb 20, 2007 | 09:18 PM
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So the EGR valve wasn't holding vacuum? It's most likely open at idle and gives you hesitation off idle cause it's open too much. Sounds like you need a new valve.
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Old Feb 20, 2007 | 09:26 PM
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Damn that is what I was afraid of...
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Old Feb 20, 2007 | 09:35 PM
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Yeh I sucks, do you get a SES light? My EGR valve and solenoid are messed up too. When I cruise at constant speed, my SES light pops on cause I think it gets stuck.

Get one from someone on here, don't buy a new one -- unless you want to, cheapest one new is $50. I just got one from a member and it's on the way.
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Old Feb 21, 2007 | 05:59 AM
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Yeah after driving on the highway for around 20 mins the ses light comes on, it wouldnt around town. Hopefully I can find on used to save some money just have to worry about it not being cracked.
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Old Feb 21, 2007 | 08:29 PM
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EGR doesn't work with LT headers. Not enough back pressure to open the valve
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Old Feb 21, 2007 | 08:38 PM
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I would just buy block off plates and get a tune, that gives you more performance and solves your problem without setting a SES light
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Old Feb 21, 2007 | 08:54 PM
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I guess some guys have forgotten the reason for EGR

Maybe we need to do state emissions. This is Virginia we're talking about.
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Old Feb 21, 2007 | 09:19 PM
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LoL sry forgot about that whole emissions thing.
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