MAF Sensor question (long).....after I replaced what I assume - Bulletin Board

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MAF Sensor question (long).....after I replaced what I assume
Posted by saabniner [Email] (#617) [Profile/Gallery] (more from saabniner) on Wed, 10 Jan 2018 07:21:48
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was the original MAF with 136K miles, it seemed to be the culprit as I immediately saw better fuel economy, performance with no engine "stumbling." At the same time my less than one year old battery seemed to be not holding a charge as it should. After about a week with the new MAF the engine began stumbling under a load and within a couple of days was actually stalling at speed: at constant throttle position it ran smooth, but if I increased or decreased the throttle position, the engine would eventually stall. After installing the old MAF, no start, I had a dead battery. A quick trip to my local auto parts house confirmed a bad battery (an AGM type that was replaced under warranty, failed after less than a year, this one lasted 9-10 months before failing.) New battery & old MAF installed, the engine cranked the first time. Question: is it possible for a failing battery to cause the MAF to send incorrect voltage output to the ECU which then makes erroneous engine management adjustments causing rough-running, etc.? (note-the new MAF was returned to the parts house for an exchange, when I get the replacement I'll post a followup.) Thanks

_______________________________________ John Whiteley Saabs owned: 75 99LE 82 900T 83 900T 86 900T 88 9000S 93 9000 CSE 96 900S Conv 97 9000 Aero 08 9-5 Aero SC- currently owned 06 9-3 2.0 convertible AT currently owned

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