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Join Date: Feb 2014
Location: Lomita, CA
Posts: 2,697
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Quote:
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Dave Last edited by mysocal911; 05-28-2020 at 07:59 PM.. |
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05-28-2020, 07:56 PM
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Join Date: Sep 2008
Location: Twin cities Minnesota
Posts: 295
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87 911 3.2 idle
I can’t adjust the mixture at idle.
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05-28-2020, 08:19 PM
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Does it not change? If i were you I would install the chip adjust the idle and mixture with the bypass jumper installed, it takes fiddling with both to get it right. Double check the idle switch. And check the o ring on the throttle body idle screw.
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05-28-2020, 11:43 PM
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Brew Master
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Easy way to check your vacuum system (I know you say you smoked it) is to pull the oil fill cap. You should be able to hear an audible drop in the idle. The jumper you're referencing is the one you do on the left side of the engine compartment? I think that bypasses the idle air control valve. If the car smooths out with that jumper in place, take the IACV off and clean it.
Your readings at the different throttle stages seem a bit off at WOT. I was thinking the car is supposed to drop into the 12's at WOT and 13's at tip in. Mine with a chip will drop into the 11's when I'm at WOT
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Nick Last edited by cabmandone; 05-29-2020 at 04:15 AM.. |
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05-29-2020, 04:12 AM
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Location: Twin cities Minnesota
Posts: 295
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87 911 idle
Bump
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06-03-2020, 06:03 PM
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Join Date: Jul 2017
Location: Australia
Posts: 40
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I had the same sort of issues with rich and surging idle on my 3.2. It turned out someone had adjusted the cog wheel spring in the air flow meter (AFM) to compensate for an older custom chip I presume. I could wind out the mixture adjustment screw 8 turns or more but it was still too rich at idle. With the spring tension tightened two teeth I was able to get a nice 0.8% CO mixture (14.2 AFR) with just over one turn out from full in on the AFM mixture screw.
Does it look like the AFM has been opened before? If so you may need to carefully adjust the cog tension to get mixtures right by monitoring each change with an AFR gauge as mixtures will change across the entire rev range. As some one else has said if you intend on doing a chip change I'd do that first before mucking about with the spring tension. Check out this previous thread Carrera 3.2 idle mixture
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Davin '87 Carrera 3.2 '66 VW Camper '59 VW Beetle |
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06-03-2020, 10:35 PM
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1985 Porsche 911 Cab
