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Weather related CIS problem?
Good day all,
Has anyone ever run into CIS problems due to weather or seasonal changes? My 81 SC was running great on Friday of last week, very minor surge on engine start, weather here in Canada in the morning is still around 50. Yesterday high humidity and fog along with the cooler temperatures. Large surges which did not stop made car undrivable and caused stalling. Today dry crisp blue sky and engine runs like advertised again. Thoughts? Thanks in advance.
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Stubby ~~~~~~~ 40 Anniversary Edition # 0255 1981 911 SC Wine Red Metallic - Sold ~~~~~~~ |
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05-27-2014, 09:58 AM
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El Duderino
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moisture in distributor?
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05-27-2014, 10:19 AM
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Reiver
Join Date: Nov 2011
Posts: 57,376
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The only thing I've noted is the CO will fatten a bit in extreme heat as that will change the ratio just a tad. The only reason I know this is my onboard AFI. Drives the same.
What you have sounds like a totally dif situation. |
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05-27-2014, 10:22 AM
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Fleabit peanut monkey
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Quote:
carrera73rs, would you call the surging rich related (usually the reason for genuine surging) or idle oscillations? I have had idle oscillations that occurred when I had an air leak at the base of an intake runner. However, the symptoms only occurred on really nasty hot days when I was stuck in slow moving traffic. For fun, look in your distributor to see if tirwin may be correct. Moisture, arcing racks or anything odd.
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1981 911SC Targa |
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05-27-2014, 12:41 PM
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I guess it could be moisture in the distributor from humidity, but car was parked in garage and stayed there all day. When I got home it fired up and ran with now symptoms of the morning.
It could be rich induced surge, but as I said it ran perfect again in the evening and all day today. Thanks for the replys and thoughts. |
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05-27-2014, 04:38 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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if you think weather is effecting your CIS that much, you may have problems with it. air leaks is a good start. mixture not set properly.
i never had weather issues with mine
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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05-28-2014, 03:58 AM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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If you had a dwell meter, you could easily check the mixture. Something to think about if you are serious about getting to the bottom of this.
Cheers, Joe 82 Targa that is not afraid of the dwell meter |
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05-28-2014, 03:07 PM
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911 40th Anniversary Edition #0255
1983 Porsche 911SC Coupe
2011 Mercedes-Benz E350 Cabriolet
1981 Porsche 911 SC Targa
