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
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