Michael, Good suggestion! I'll try it.
Thanks, Charlie On Tue, Feb 8, 2011 at 4:44 PM, <[email protected]> wrote: > Charlie Slayman wrote: > > Date: Mon, 7 Feb 2011 00:21:15 -0800 >> From: Charles Slayman <[email protected]> >> Subject: [alfa] Marginally High CO Emission from L-Jet Spider >> >> >> Dear Alfisti, >> >> I just failed the bi-annual California emissions test on my '89 L-Jet >> Spider for marginally high CO at 25mph. Here are the results: >> >> 2801 @15mph, Max CO Allowed 0.78%, Measured CO 0.78% PASS >> 2870 @25mph, Max CO Allowed 0.66%, Measured CO 0.78% FAIL >> >> The other tests (HC, NOx) passed and actually get better with speed, so >> the >> catalytic convertor is working. This looks like a problem with the >> mixture >> running rich. The O2 sensor is working and the temperature sensors are >> working (so the L-Jet is not running rich intentionally because it thinks >> the engine is cold or the O2 sensor is dead and defaulting to a rich >> condition). >> >> Have any of you experienced a rich condition on an L-Jet that was not due >> to >> a dead O2 or temperature sensor? >> >> > Perhaps the AFM spring is getting tired and telling the ECU to stuff too > much fuel into the engine? Tightening up the AFM air flow door flap spring > should fix your rich problem. We had an '86 LJet Spider for which someone > had apparently tightened up the spring too much and it was running > chronically lean. We loosened up the spring and fixed that problem. You > should be able to lean up your engine adequately. I'm guessing the spring is > losing temper and just a tooth or two of tightening up would fix it. Easy > fix. Look up the LJet pages on Greg Gordon's site for any details you might > need about accessing the spring. > > Michael -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
