924Board.org

garyj19 · Joined: 04 Sep 2005 Posts: 226 Location: Connecticut

i just noticed for the 100th time that my dash has an EGR light, but i forget about it becuase it never comes on. i know there could be circuit issues, etc but what actually trips the light? i know in modern cars there are egr monitors and the computer turns the light on, but not in the 924... is it on a timer on my odo? what kind of on board egr diagnostics does my 924 have?
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early 77 924 na

garyj19 · Joined: 04 Sep 2005 Posts: 226 Location: Connecticut

really? nobody knows?
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early 77 924 na

brealytrent · Joined: 28 Dec 2008 Posts: 414 Location: Goldsboro, NC

Hmmm...Not sure. My '77 doesn't have an egr light on it. I know the later, closed-looped CIS systems had an oxygen sensor with a light that came on every 30,000 miles or so. Maybe it's the same idea?
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1977 Porsche 924 - sold
1980 Porsche 931 - sold
1984 Porsche 928 'S2' Euro - sold
2016 Ford Fiesta ST - sold
2009 Porsche Cayman

!tom · Posted: Sun Apr 10, 2011 11:46 am Post subject:

You're definitely confused. The EGR system is controlled by engine vacuum. There is no light associated with it.

Perhaps if you could describe this mystery light we could tell you what it is.

The Haynes manual is quite helpful in this regard.
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78 924 NA
5-lug

KDJones2000 · Joined: 14 Sep 2010 Posts: 322 Location: Phoenix, AZ

It's just ODO based. There is a reset procedure for it in the Haynes manual. Not sure if this is for your year not, though.
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1987 924S SPEC car
Team Toofah Racing
1988 944 Turbo S

76Delorean · Joined: 08 Jul 2010 Posts: 8 Location: Rhode Island

!tom · Posted: Thu Apr 28, 2011 3:26 pm Post subject:

You may have a light that came on, but it's not EGR. There is no such thing as an EGR light.

There is a light on cars with electronic idle stabilization that indicates when the O2 sensor needs to be replaced, but this was not available on models that old from the factory.

If you show us what you are talking about, you may get some helpful answers.
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78 924 NA
5-lug

garyj19 · Joined: 04 Sep 2005 Posts: 226 Location: Connecticut

I will get a picture up as soon as i can, but it is definitely there. sounds right that its odo based, my odo does not work so that would explain why it has never come on. not confused at all
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early 77 924 na

surfnturf · Joined: 12 Nov 2010 Posts: 8 Location: South Carolina

I don't have any answers but I think this must be the light you are refering to.

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1977 1/2 924 needing lots of work

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

Ouch.

!Tom = !Right

Whoops.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)