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Unplugged EGR, runs much better
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ghiebert
New User
Feb 7, 2012, 9:31 AM
Post #1 of 2
(3920 views)
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Unplugged EGR, runs much better
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I'm new here, not a mechanic, so I hope I do this right.
Bought a project car, 1986 Chev Celebrity with 4 cylinder 2.5, Base model. Ran great although sometimes it would seem a bit hesitant starting. When the cold snap hit Alberta it wouldn't start. Would fire right away but die and then not fire at all except very briefly. Could smell gas, battery seemed OK. To be sure, I jumped the car and eventually it started but shuddered badly and wanted to die.
Uses an ODB1 connector, so I tested and got code 45 which is too rich. This made me think of the EGR valve. This one has no wires, so I pulled it and it was pretty clean. I oiled the pindle, when depressed the diaphragm made quiet crinkly noises as if it was crunching paper inside. Put it back in, and then pulled the vacuum hose from it and the car started immediately, revved and then settled to a normal idle. When I put the hose back on, the engine wants to shudder badly and die, so I left it ff. Is this bad? I have ordered an EGR valve. In the meantime, could someone explain why the car runs better without it? What does it mean when they say a stuck EGR can be like having a vacuum leak?
(This post was edited by ghiebert on Feb 7, 2012, 9:35 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Feb 7, 2012, 10:12 AM
Post #2 of 2
(3905 views)
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Re: Unplugged EGR, runs much better
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It runs better because it's not supposed to be receiving vacuum at idle. The new valve isn't going to correct anything. You have to find out why it's getting vacuum at idle.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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