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LBauer · Joined: 21 Mar 2007 Posts: 1 Location: Big Island, Hawaii

I shipped my 79-924 from California to Hawaii. It ran great in California but once at sea level it is just having the hardest time idling. Does anyone know of any altitude adjustments necessary? Looking through my repair manual I sure don't see anything? Any Ideas?????

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

Yeah race cars have this problem a lot.

I don't know what the measurements are but I think the higher you go, the less air density and the cars run more lean. At sea level they use more air and need more fuel, I think.

Don't quote me now but you're on the right track.

Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

It's an N/A right? {No turbo}

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

Yep, gotta richen it up a bit.
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WeiBe (1987 924S 2.5t) - 931 S3

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

yep, got the same problem....you just need to adjust it a bit.
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Neil924 · Joined: 18 Mar 2003 Posts: 4225 Location: Canada

Yeah I checked it out, try "richening" up the car. A.K.A. give the car more fuel. Also check for a vacuum leak, something could have happened during shipping.

Could you pick up an Auto meter air/ fuel gauge at a local parts store, or do they only sell alcohol and surf boards in Hawaii?

Tigger937 · Posted: Tue Oct 09, 2007 4:04 am Post subject:

Just head up Mauna Kea to confirm.

Mahalo and Aloha! A hui ho!
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1981 931 (Concours)
1982 931 (Daily Driver)

"Think outside the box"

!tom · Posted: Wed Oct 10, 2007 3:18 am Post subject:

That's interesting.

I always thought the air metering plate inherently took the air density into account based on the physics of how the fuel injection worked.

It's true carbeurators need this type of adjustment, but not fuel injected cars (mechanical or electronic), based on how they work.

The increased density of air at lower altitudes would cause an increased deflection of the air metering plate (for any throttle setting), causing a proportionally larger volume of fuel to be injected. Already compensated for!

Sounds like maybe a climate change has caused an air leak in your intake plumbing.
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78 924 NA
5-lug