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Calling someone who knows something about the fuel system... 700 1988

uid 27's pic
posted by  Art Benstein on  Sat Jan 5 15:49 CST 2002
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Don't have any experience with LH2.2. I've scoped the unheated sensors on my two LH2.0 cars; the ECU's mixture adjust test point faithfully follows the transitions across 500mV. Best rate (when well warmed) with the unheated sensor brand new is roughly 1.5 cycles per second. Much slower during warmup.

Mine always goes lean accelerating under load but I'm not absolutely confident there isn't some false air (vacuum leaks) and my injector performance is unknown, though the fuel pressure is well regulated.

I have a question for you regarding the mixture test point you connected the LED to: Are you getting any brightness from the LED? Can you see the transitions?

The Bentley manual describes the Volvo tool 5280 being connected (for both LH2.0 and LH2.2 240s) between battery and test point. My ECUs (503 and 510) provide this test point output directly from the 8039 processor through a 10K ohm resistor. This is hardly enough to directly drive an LED for practical viewing. Perhaps this is different in your ECU, but for mine to be useable I have to buffer the output driving the LED with a transistor.

Art Benstein






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