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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
Posts: 29,522
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MFI Injection Pump Question
I was tuning my engine in preparation for emission testing (ugh!) required by my move to DC. In doing so, it's clear that I need to lean out the pump's part-load setting. I never felt a need to adjust this in the past (pre-rebuild), but when I wnt to do it yesterday, I was stumped by where this adjustment is located. Is it supposed to be behind the hex head screw shown in the pic below? If so, I couldn't find any adjustment behind it. Or, am I barking up the wrong tree? Any help would be greatly appreciated.
 
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Jim R. |
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06-24-2006, 02:13 PM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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Yes, that's where you access the main rack adjustment.
You need a really long and thin flat-blade to adjust it. One click makes a significant change, so don't get greedy. Clockwise is lean, CCW is richer. Do you have the proper tools? Even with the proper adjuster tool, I've had difficulty getting it to engage in the slot. Sometimes having to bend the tool to get a straighter shot in the hole.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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06-24-2006, 02:27 PM
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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
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Thanks Tyson! So, does the screw driver need to go way into the pump? I tried a small screwdriver that extended 3"-4" into the pump, but felt nothing on the inside.
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Jim R. |
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06-24-2006, 02:29 PM
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Registered
Join Date: Jan 2002
Location: Long Beach CA, the sewer by the sea.
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It's not 3-4 inches, more like an inch. Once you find the slot, note the index of the end of the tool (your end). This will help you reengage the screw should you decide to go for a 2nd adjustment. Your adjustment will most likely affect the idle speed. You 're entering "The Twilight Zone" when you start with this stuff. Write everything you do down with diagrams and dates.
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06-24-2006, 02:39 PM
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Bandwidth AbUser
Join Date: Nov 2001
Location: SoCal
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uh oh! I went straight in much further and didn't find this adjustment.
 Thanks guys!
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Jim R. |
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06-24-2006, 02:44 PM
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Registered
Join Date: Jan 2002
Location: West Lafayette Indiana
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Jim,
Did Souk help you pick out the Jetta?
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Dennis H. 72 911E 2.7 RS stuff 72 911T with a 2.7(Sold 5-13-2011) 2012 Kona Blue Metallic Mustang GT Convertible 6spd 67 Mustang coupe future SVRA group 6 car 63 Falcon hardtop 302/4spd |
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06-24-2006, 03:05 PM
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Registered
Join Date: Sep 2002
Location: Leesburg, VA
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Straight in ... you'll find it after a couple inches. In gently 'til it stops, then turn with light pressure. You'll feel it click into the slot.
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Greg |
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06-24-2006, 06:02 PM
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Bandwidth AbUser
Join Date: Nov 2001
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Well, I'll give it another try. Thanks!
Dennis, that's not funny! 
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Jim R. |
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06-24-2006, 06:40 PM
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