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| EGR Gasket (Page 2/2) |
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ArthurPeale
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NOV 17, 01:04 PM
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| quote | Originally posted by Kitskaboodle:
If you check Rodneys site (egr section) and also the FieroStore, both will tell you that A) the small orifice gasket goes on the intake plenum side and the “normal” bigger hole egr tube gasket goes on the egr valve side. B) The reasoning for this is that IF you get a vacuum leak at the egr tube, the restriction will minimize the vacuum leak. |
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interesting. So, the only reason is a "just in case of breakage" issue. Cool!
regarding my previous question for possible cross-reference, any other gaskets that might fit?
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Notorio
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NOV 26, 02:40 PM
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Here's a head scratcher (for me anyway): the post-Thanksgiving, Christmas decoration time is here and the Fiero is in the way. So instead of pushing it out/in of the garage as I have been doing, and looking toward ease of movement during the holiday season, I put the EGR tube back on. I thought I'd try a little experiment and put a big OD gasket on both ends, figuring with the EGR closed at idle it wouldn't matter, and who knows, maybe the higher amount of recirculation at the higher test rpm might lower my NOx. Well, just starting the car it went to 4000+ rpm right away. I switched the car off and checked the TPS (yes, plugged in), and the throttle cable (yes, connected and responds to the gas pedal) but everything looks fine. I did this several times, never running for more than a short burst.
Now, BEFORE I go and replace the intake-side with the tiny-hole gasket, does anyone think there is another cause for this runaway rpm?[This message has been edited by Notorio (edited 11-26-2022).]
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fierofool
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NOV 26, 05:01 PM
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| quote | Originally posted by PhatMax:
I believe the EGR Gasket has two different gasket is because there is a “spacer” block between the ear and the exhaust pipe.
I’m not sure why it makes a difference which end the smaller one with the restriction goes |
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The reason the small orifice gasket goes at the manifold end is to prevent wide open throttle in the event something happens to the EGR tube or valve. I have seen just one EGR valve that totally failed and the pintle and diaphragm were just floating freely and wide open. Should the tube break, you have an open source of fresh air and the sensors will try to balance the air/fuel mixture and it's off to the races.
Edit: Didn't see Kitskaboodle's post, but it's worth repeating because so many make the mistake.[This message has been edited by fierofool (edited 11-26-2022).]
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fierofool
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NOV 26, 05:13 PM
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Arthur Peale, you might look at the gaskets for a Firebird/Camaro 3.4 or any of the Beretta V6 engines. That's for the EGR tube gasket. You might have to open up the spacing on the holes a bit and this is based on what I've read about using EGR tubes from those engines as a replacement for the Fiero. Seems the hole spacing in the flange is a little wider. The top-end manifold gasket sets I have bought from FelPro for the 60* V6;s that includes the 3.4, 3.1, and 2.8 all come with those gaskets. For the EGR valve gaskets, I have had no problem getting them at AutoZone
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fierofool
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NOV 26, 05:17 PM
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| quote | Originally posted by Notorio:
Now, BEFORE I go and replace the intake-side with the tiny-hole gasket, does anyone think there is another cause for this runaway rpm?
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Two areas you might check. The two vacuum lines that attach underneath the throttle body and the bottom side of your cruise control canister.
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