Stefano, My 1750 is averaging in the upper 20s and it has a Wes enhanced Spica, large valves, Euro cams, and headers, so your mid teens seems low even with the cams.
A single screw should hold the TA down to within less than a millimeter which shouldn't cause the reduced TA extension due to the single screw to be a big problem. (unless the broken one extends above the pump and helps to hold the TA up) The most likely causes are: 1) Fuel Cutoff Solenoid is not correctly adjusted and the engine is running way too rich. 2) TA does not extend correctly so FI thinks the engine is still cold and again runs rich. 3) The Cold Start Solenoid could be stuck on and that would also cause the engine to run rich. Based on your mileage, the Fuel Cutoff Solenoid sounds like where I would start, as that can be adjusted in the car, only have to loosen it and run the engine at constant speed per the instructions in the AROC Spica manual or Wes' manual. John Justus [email protected] 1971 1750 GT Veloce 1973 Montreal (work in progress) 1995 164 Quadrifoglio > -----Original Message----- > > Date: Sun, 27 Sep 2009 15:44:06 -0700 > From: Stefano Iachella <[email protected]> > Subject: [alfa] Spica pump w/buggered TA mount and gas mileage > > Long subject line. Here's the story. Ever since I've owned > my 74 GTV, I've had the same Spica pump. The car has > always run great, even after a fresh Norman head and 10.2mm > cams 6 or 7 years ago. A short time after the rebuild, my > mechanic said, "Y'know the TA mount is all buggered up. > The TA is only held on by one screw. I tune it the best I can." > I inspected it and one screw had snapped off at some point > in the distant past. Someone tried to tap a new hole just off > to the side, but that didn't work out so well for them, so they > left it with only one screw holding the TA on. > > I recently started thinking about this again because I never > get more than 135 miles on a tank of gas. I have never figured > out the mileage, but with an 11 gallon tank and putting 9 to 10 > gallons each fill that makes something like 14 or 15 mpg. Not > really right for a Spica system unless something is amiss. > > Could a poorly seating TA contribute to bad gas mileage? I > have a spare pump that is on the engine I had removed from > my Alfetta when I put in the TS into it. Should I be thinking > seriously about sending this worn pump out to Wes and > installing it on my GTV? > > Thanks, > Stefano > Concord, CA -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
