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In a message dated 97-09-02 03:42:44 EDT, toby@gonzo.wolfenet.com (Toby Basiliko) writes: << > > My 69 FI Sqrbk has an astonishing 9% CO at idle I just noticed. > Amazingly it runs fine, gets 25 mpg at 75mph. > I checked everything except the pressure sensor, which I know is > slightly out of tolerance. > Can the pressure sensor get my CO so far out of wack? > I got some spare sensors but they're all 051C while I need 051B. > Next weekend I will go to my favorite VW junkyard with about 30 - 50 > type III's to get the correct one. > Did they ever make a ECU with a CO adjusting screw like on the late type > IV's? > Martin Peitz >> If I am not mistaken, the fuel injection fires the injectors TWICE with every four cycles instead of once. There are only two sets of contacts in the bottom of the dist. to "drive" the injectors for the four cylinders. Which means that the injectors fire once for no good reason other than simplicity... Scott --------------------- Forwarded message: From: toby@gonzo.wolfenet.com (Toby Basiliko) Reply-to: toby@gonzo.wolfenet.com To: type-3@umich.edu Date: 97-09-02 03:42:44 EDT Could it be: Ever so slightly leaky injectors? Toby B Martin Peitz wrote: > > Question for the experts: > > My 69 FI Sqrbk has an astonishing 9% CO at idle I just noticed. > Amazingly it runs fine, gets 25 mpg at 75mph. > I checked everything except the pressure sensor, which I know is > slightly out of tolerance. > Can the pressure sensor get my CO so far out of wack? > I got some spare sensors but they're all 051C while I need 051B. > Next weekend I will go to my favorite VW junkyard with about 30 - 50 > type III's to get the correct one. > Did they ever make a ECU with a CO adjusting screw like on the late type > IV's? > Martin Peitz