RE: [DML] Lambda system/duty cycle

["John Hervey" <john@xxxxxxxxxxxxxxxx>]

Phil, Something is overriding the signal from the 02 sensor to the ECU then
to the FV. If the 02 sensor has been exposed to a lot of fuel contamination
due to running rich in the past year then it may be contaminated so bad it
can't monitor the air in the exhaust. Get a reading from the 02 as it heats
up to see if it's sending a voltage to the ECU. Also, the FV may not be
opening. I have several good used ones it you need to try one. As you did
the WOT switch would over ride the ECU function.
John Hervey
www.specialtauto.com


-----Original Message-----
From: Phil Priestley [mailto:phil@xxxxxxxxxxxxxxxxxx]
Subject: [DML] Lambda system/duty cycle

Just got the car back from the shop after having the heads fixed where
they had corroded through. Runs great now except for one thing.

It was running a bit rich so I hooked up the trusty dwell meter to set
the CO mixture and discovered that the duty cycle stays steady at about
54 percent or so. I can adjust the mixture until it leans out and dies
or till black smoke is billowing out the tail pipes and the duty cycle
stays the same. It's like the ECU has went into limp home mode for some
reason.





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