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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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 Posted: Wed Feb 08, 2006 1:21 am Post subject: |
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Yes, as Gohim mentioned - the opening needs to be sealed with either a rubber plug or a ball bearing depending on the model. Left open, it's a vacuum leak. Air entering there hasn't been metered or filtered.
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"..it's made in Germany. You know the Germans always make good stuff."
'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox |
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Neil@Bournemouth
Joined: 25 Oct 2005
Posts: 24
Location: Bournemouth, UK
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| Posted: Wed Feb 08, 2006 1:25 am Post subject: |
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Cheers Smoothie,
One problem found one hell of a lot to go! |
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FASTdan
Joined: 30 Jan 2006
Posts: 81
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| Posted: Wed Feb 08, 2006 6:23 am Post subject: |
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| Neil@Bournemouth wrote: | Cheers Smoothie,
One problem found one hell of a lot to go! |
i know the feeling lol.
i dont see how this is a vacuum leak though? as im sure its right behind the air filter (so effectively open to atmosphere?) as i can access the underside of it if the filter is removed?. therefore its only crime being that it is un-filtered?
please correct me if im wrong?
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1980 924LUX |
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Wed Feb 08, 2006 8:45 am Post subject: |
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The hole allows air in on the top side of the metering plate, effectively bypassing the plate and upsetting the mixture.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance |
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FASTdan
Joined: 30 Jan 2006
Posts: 81
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| Posted: Wed Feb 08, 2006 6:08 pm Post subject: |
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| Ozzie wrote: | | The hole allows air in on the top side of the metering plate, effectively bypassing the plate and upsetting the mixture. |
ah fair enough, I better bung it up.....will just make it run even richer now though lol 
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1980 924LUX |
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Iwan
Joined: 26 Jan 2006
Posts: 8
Location: UK
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| Posted: Sun Feb 19, 2006 10:24 am Post subject: Two additional issues aroubnd smooth running |
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K-Jetronic is very simple; on early 924s there's no idle stabiliser and none have an air-mass meter. Therefore cold days (dense air) will give different readings to warm days - less dense air. The ideal stochastic ratio 14.7:1 is a fuel to air ratio by WEIGHT. So expect some fluctuations...
On a more mundane level - 924 spark/ HT / Ignitions leads (thats wires to you in the USA) can get warm as they sit above the exhaust manifold. When wires get warm the resistance changes - and any faults will become apparent - if you have erratic running or idling when hot -check these out.
My 924 is very senstive to octave levels - there's no knock sensor on K Jetronic and associated chenges in advnace-retard or fueling timing. A lot of supermarkets in the Uk sel 'pool petrol (gasoline) thats been sitting around for a hwile - the octane level ca dive from the stated 93 to around 90. I find my car runs best on BP Ultimate (circa 97). These cars were designed to run on older spec gas at 98 RON - so tweak the timing a little for smooth running |
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