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04-16-2011, 08:59 PM
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#1 |
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Registered User
Join Date: Sep 2003
Location: lebanon tn.
Posts: 96
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EGR Relay
Hey Guys, Does the egr relay go bad and what problems would it cause?I have a 91 350 automatic,running rough.also can anyone post picture of where the other vaccum line goes,beside the one going to egr valve.already changed Egr valve. Thanks Bobby
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36 master 36 master delux coupe,6cly,3sp. 58 impala,348 3 duces,4 sp. 56 belair,302,4sp,12 bolt. 2000 silverado,5.3 auto. 65 foo foo rd,352 auto,for sale |
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04-16-2011, 09:32 PM
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#2 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: EGR Relay
If it is a 1991 C/K1500 series truck it most likely has a negative backpressure EGR system, which technically has an EGR solenoid and not a relay.
On negative backpressure EGR solenoid there is one port which is the vent and should be left open, but people find a spot they think should have a vacuum hose, so they plug the vent port. The vent port does not have barbs on it like the one that is supposed to go to the EGR valve. Leave it with nothing connected to it. I suggest only using an OEM (Original equipment manufacturer) replacement EGR valve. These TBI truck are very picky about the EGR valve operation. If the solenoid bleeds vacuum through it when it should be closed it can cause a poor or rough idle. If it will not open, then it can cause pinging and set a code 32.
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For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. Last edited by ChevyTech; 04-16-2011 at 09:38 PM. Reason: Typo & add more |
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04-16-2011, 10:12 PM
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#3 |
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Registered User
Join Date: Sep 2003
Location: lebanon tn.
Posts: 96
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Re: EGR Relay
Thanks Chevy Tec,I have it pluged off now,will open it up. Bobby
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36 master 36 master delux coupe,6cly,3sp. 58 impala,348 3 duces,4 sp. 56 belair,302,4sp,12 bolt. 2000 silverado,5.3 auto. 65 foo foo rd,352 auto,for sale |
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04-17-2011, 07:41 AM
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#4 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: EGR Relay
You’re welcome.
With the vent plugged it can cause the EGR to be open when it should not be open.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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