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Registered
Join Date: May 2006
Posts: 1,191
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Rev disturbance @ ~5200 and dying at idle
Okay, a couple of questions: Just got back from a drive and noticed once again that around 5200 rpm there is a disturbance (i guess) where the rpms shutter and become rough. I was on 35 mph roads so i couldnt take it much higher than that (cops everywhere). I am running PMO carbs on a 72 S (MFI in a box in the basement...dont worry
 ). Whats the problem?Also, after cruising at 3500 rpm or higher and coming to a stop to park or at a light/stop sign, the rpms drop and engine dies and the red light comes on. Sometimes it doesnt do this but it always close enough that I end up having to brake with my left foot and keep the idle up with my right (once out of gear). When not moving and the car is warm, it idles pretty nicely at ~800 rpm although it intermittently drops a little low only to come back up. Is this just a simple idle adjustment fix or something more? Any help is appreciated. Brian |
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05-22-2007, 03:01 PM
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Join Date: Jun 2004
Location: Rio Rancho, New Mexico
Posts: 1,325
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The idle jets are the smallest port through which the fuel must flow.
I would pull them out and check all of them for any blockage. If they are blocked, blow them out carefully. Then remove the screw that covers the mid range ports. Clean as necessary. Next replace the fuel filters, then cut open the old ones to see for sure how they look. Crap from these old fuel tanks is common. If you find much dirt you may want to clean the fuel tank and clean the carbs.
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DOUG '76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's. '85 911 Carrera, stock, just painted, Orient Red |
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05-22-2007, 05:23 PM
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Join Date: Nov 2002
Location: Connecticut
Posts: 445
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Have u changed anything else, like a muffler, since removing the MFI?
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05-22-2007, 05:26 PM
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Join Date: May 2006
Posts: 1,191
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davec, I replaced the muffler with an identical unit about a year and a half ago. 2.7racer, i cleaned the idle and mid jets about 10 months ago and it made an improvement. maybe i have more debris in there
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05-23-2007, 07:32 AM
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Registered
Join Date: Nov 2002
Location: Connecticut
Posts: 445
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Sorry, no wisdom there. There are too many variables. Where do you live in VT? You're welcome to come down and tinker. I'm in NE CT. I have a pretty complete garage. DC
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05-23-2007, 09:04 AM
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