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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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MAF question
I was replacing the MAF / aircleaner gasket and noticed that my MAF had a hole drilled in the red outlined area. It looked like someone had stuffed rolled paper in there to block it. The hole was drilled at a downward angle and there were several passages visible. Was there a vacuum feed off there at one time? Maybe one of the PO's mechanics tried to diagnose a problem there? (I've had the car 8 months.)
Anyhow, I siliconed a thin aluminum plate over the hole to seal it up. Maybe it's my imagination, but the car seemed more responsive after that. thanks, Bill K (picture is from the Pelican FS thread) 
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73 911T MFI, 76 912E, 77 Turbo Carrera Last edited by bkreigsr; 06-06-2011 at 10:34 AM.. |
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06-06-2011, 10:32 AM
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Member 911 Anonymous
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That is a technique to remove the CAP that is immediately below to gain access to the AFR 3MM Allen Hex adjustment valve on your AFM ( or as you said MAF).
Place your finger there if there is a hole it has removed and been molested. Silicon in that hole is going to do nothing.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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06-06-2011, 10:44 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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thanks Draco. all this motronics is new to me and I'm still learning the terminology of the components. where is the 3mm adjusting screw - in the afm or below it in the manifold? when did the hole stop appearing?
Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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06-06-2011, 10:51 AM
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Member 911 Anonymous
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Literally, put your finger right below that hole in the pic, feeling upward on the AFM. You should feel a hole or even a cap if the PO/Wrench put it back. Maybe size of a dime in OD. If cap is gone, you can actually fit the tip of your finger in it, if not fat like my monkey hands
 The 3MM adjuster is in there. The hole was tapped in by the PO/Wrench, 3.2's with out the hole has never been tampered with, kind of rare, due to change in Gas Quality over the years.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC Last edited by DRACO A5OG; 06-06-2011 at 10:59 AM.. |
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06-06-2011, 10:56 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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thanks
cool beans. so the PO wasn't exaggerating when he said 'maintained by a qualified Porsche technician'. Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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06-06-2011, 11:15 AM
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Member 911 Anonymous
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Probably, that is the only way known to remove the cap without destroying it.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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06-06-2011, 11:17 AM
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cycling has-been
Join Date: Sep 2004
Location: Jersey Shore
Posts: 7,242
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Sorry to still be so ignorant about this.
Okay, I still have the cap on the bottom. From the layout of the afm, I assume that the 3mm adjusting screw is accessed throught the hole after the cap is removed and is toward the top of the afm? Is this a method of changing the air/fuel ratio to effect emissions or performance? Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera |
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06-07-2011, 04:32 AM
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Registered
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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"Is this a method of changing the air/fuel ratio to effect emissions or performance?"
Actually, it will do neither. 1. With regard to emissions, it only affects the idle mixture and only if the O2 sensor is disconnected. Obviously if the idle mixture adjustment is changed beyond the control limit of the O2 sensor, then the mixture adjustment can affect the emissions. 2. There's no performance affect.
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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06-07-2011, 06:51 AM
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Marble Grey
