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Missing EGR???
Topic Started: Apr 24 2014, 09:21 PM (601 Views)
bkelly
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Gear Head

I am not sure I have a EGR? I wonder if the previous owner removed it.

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Deleted User
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Someone probably changed the hood.

The majority of 1991 Geo Metros did not have EGR valves.

What's the VIN?
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bkelly
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Gear Head

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myredvert
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myredvert

Yep, that's not a '91 hood. In the interest of keeping that beautiful car "original," you should trade hoods with me. I'll take your hood with the wrong sticker off your hands, and give you one with faded paint and checked clear coat the correct sticker. Deal? :whistle
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bkelly
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Gear Head

myredvert
Apr 24 2014, 09:45 PM
Yep, that's not a '91 hood. In the interest of keeping that beautiful car "original," you should trade hoods with me. I'll take your hood with the wrong sticker off your hands, and give you one with faded paint and checked clear coat the correct sticker. Deal? :whistle
If it was a GTI hood I would swap. :-/
Along with the lamps, bumper cover and hood latch. Lol
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bkelly
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Gear Head

The head has tubes in the exhaust ports just above the top of the valve for an EGR. I assume there is no benefit in cleaning them?
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bkelly
Apr 25 2014, 01:03 PM
The head has tubes in the exhaust ports just above the top of the valve for an EGR. I assume there is no benefit in cleaning them?
No need to get completely sanitary with cleaning the passages. A little scrape and blow before you drop off that head at the machine shop will mean that most likely it will come back spotless. I use a drill that's slightly smaller than the hole in the head, followed by a small ball stone honing. The passage in the exhaust can stay carboned up for the rest of time. The archeologists need something to date your car with, just in case the data plate gets lost. ^o)

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Woodie
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bkelly
Apr 25 2014, 01:03 PM
The head has tubes in the exhaust ports just above the top of the valve for an EGR. I assume there is no benefit in cleaning them?
You talking about these?

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That's not the exhaust port, and they have nothing to do with EGR.


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bkelly
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Gear Head

I assumed it was the exhaust but didn't really look I guess. What are the tubes for.
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t3ragtop
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Turbo3 and Twincam Tweaker

those are "swirl tubes." i have just ground them off while doing the old port and polish on g10 heads and never noticed a difference. :P

91 verts didn't have egr valves. there's no wiring from the ecu to support one, either.
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clarkdw


The "swirl tubes" on regular emissions cars (pre-94) run through passages in the intake manifold and are connected to two small drillings in the bore of the throttle body that are covered up by the throttle plate when it is closed.

On 94-95 "upgraded" emissions they are connected to passages in the intake manifold that provide the signal for the MAP sensor and the fuel pressure regulator. I have not inspected any 96+ but judging by the similarity of the controls to the 95 I would assume that the tubes are connected the same way in them.

Edit: Oops, too fast an inspection. They also go to a port adjacent to the throttle plate but a single one and not covered when the plate is closed.
Edited by clarkdw, Apr 26 2014, 07:58 PM.
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bkelly
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t3ragtop
Apr 26 2014, 05:56 PM
those are "swirl tubes." i have just ground them off while doing the old port and polish on g10 heads and never noticed a difference. :P

91 verts didn't have egr valves. there's no wiring from the ecu to support one, either.
I like the way you think. :thumb
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