Michael, I like your idea of pulling the injector rail and looking for leaks with the system energized! That fits my criteria of simple/inexpensive tests.
Thanks, Charlie On Thu, Feb 10, 2011 at 1:46 AM, <[email protected]> wrote: > Charlie Slayman wrote: > > But I don't want to spend more money on testing until I've exhausted >> the simple causes. Since HC and NOx levels are good and O2 is at 0%, >> things >> point to a rich mixture rather than a bad cat. Since water temp sensor is >> working and O2 sensor appears to be working, I'm leaning towards leaky >> injectors. But before I pull them and send them off for cleaning and >> rebuild, I'm going to try tightening the AFM spring and take it in for a >> second test. I'm so close to passing that I want to minimize my work. >> >> Thanks, >> Charlie >> > IF you wanted, you could pull the fuel rail and injectors free of the inlet > ports and activate the fuel pump, then check directly whether the injectors > are leaky when closed. Just a thought. > > Our LJet Spider was unable to cope with the lean (over-strong spring) AFM > setting with which came to us. The functional O2 meter showed us a zero > signal (tens of mVolts) until we spiked its intake manifold with > hydrocarbons, upon which it started telling us more than zero, and upon > which the engine smoothed out and started running more happily. I know > -some- springs lose spring constant over the years, having heard too many > stories of suspension springs sagging. It seems worth tightening up the AFM > flapper spring before doing more invasive things. > > How will you tell when you have hit upon the Right Thing among the many you > are planning? If you can't get a sufficiently fast voltmeter, you might want > to borrow an oscilloscope from someone. Gosh, the way things are going in > the electronic world, you might be able to get an LCD readout 'scope with > kHz resolution for $69.99 pretty soon. > > Michael -- to be removed from alfa, see http://www.digest.net/bin/digest-subs.cgi or email "unsubscribe alfa" to [email protected]
