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Old 05-29-2010, 12:05 AM   #11
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ok dan, pulled the codes on my way home tonight, p404 egr circulation system.
and also hearing definite sounds of a vacuum leak now
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Old 05-29-2010, 12:12 AM   #12
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Here'* a write up on that code. https://www.gmforum.com/showthread.p...00#post1391437

Try to locate the vacuum leak. With the EGR code, the leak might be in the EGR tube, these are a bit harder to find so you may have to remove the tube and hold it up to the light. They do get brittle and crack. This could be a big part of your problem.
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Old 05-29-2010, 12:20 AM   #13
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im gonna try and take the ole propane torch around tomorrow and see if ican get a rise out of her, and as for the corrosion, i have been upside down in that thing for awhile chasing the light wire and seen no such signs of any such damage.
and thanks again for all your help sir
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Old 05-29-2010, 12:23 AM   #14
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Any time. Oh, and a cracked EGR tube may not show up testing like that. I've seen a few that were cracked and I sprayed and sprayed and got no reaction.
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Old 05-29-2010, 12:26 AM   #15
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well if i can make whistle i can find it im sure.
thnx again
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Old 06-02-2010, 09:58 PM   #16
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one last question sir, has anyone done egr delete on these engines?
not worried about thrwing codes or deq, just very broke and tired of this gutless wench.
maybe braze both ends of pipe shut and unplug egr?...any thoughts?
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Old 06-02-2010, 10:28 PM   #17
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The EGR is shut off in the computer at idle and full throttle, but everything else will suffer performance wise.
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Old 06-02-2010, 10:38 PM   #18
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well trust me it cant be worse than it is now...lol
and it would just be for a couple weeks untill i get some cash, i mean really my 3 cyl 87 sprint would blow the doors off this thing..lol
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Old 06-02-2010, 10:43 PM   #19
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You can block it off, but will need to block both ends. Those of us with intercoolers can't run the EGR, so ya, a EGR delete is possible. If you have access to a member with HPtuners you can have them change the turn on temp to 284* and then it will never turn on. If the valve is closed, just unplug it.
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Old 06-11-2010, 12:58 PM   #20
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ok just a lil update, took off the cat pounded all that expensive metal out, and she runs great.
still need an egr and plugs and wires and prolly coils, but shes running much better now.
thnx again
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