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Date: 27 May 2004 20:17:49 GMT
From: Dave Hinz <DaveMay2004nospam-creek.net>
Subject: Re: Air Mass Meter Question


On Thu, 27 May 2004 18:48:00 GMT, Mark <slycheesenospampam#flashmail.com> wrote: > Hi Dave, thanks for the response. I'm a mechanical engineer, maybe > the style of my post reflects that. :) I'm software, but I play electrical and mechanical in my spare time. > I see your point that more needs to work than just the wire burn off. > Is the circuitry that performs the control loop in the AMM or is it > located in the LH unit? I believe the bridge circuit is right in the AMM, since they're pretty balance-sensitive and are measuring very low differences in resistance. Probably the amplifiers which drive the filament heat as well. There's only like 6 pins on the AMM's connector, right? (going from memory of my '88) > I do think something is failing (not just appearing to fail) because > the engine definitely stumbles for a split second, periodically, and > it is often accompanied by the check engine light illuminating for a > second. But where in the feedback loop is the problem? Is it stumbling because the AMM is sensing a problem, or is the AMM providing wrong input which causes the fuel injection to make it stumble? I'm not sure what the answer is. That having been said, a few dozen thousand miles of life on an AMM is unusual. I suspect the problem is elsewhere, unless you're just plain unlucky. Dave Hinz

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