Question about 1992 Buick LeSabre
Removed o2 sensor thinking exhaust was restricted ran engine with o2 sensor removed, no change. Disconnected electrical connection at mass air flow sensor. Was able to keep running on cold start but just barely. Once engine would idle on its own. Reconnected mass air flow sensor engine died. Disconnected engine would run although poorly. Have replaced mass air flow sensor. Is it possible iacvalve could be defective? Have replaced iac valve twice.Beleive I have a lean condition because either or starting fluid in snorkle makes eng run normal. Have done propane leak test around upper and lower intake. Noticed strange condition. Temp gauge will fluctuate from left to right when cranking & amp gauge goes from 14 to 8 while cranking. Removed throttle body and all sensorscleaned thourghaly replaced t/body gskt . Scanned computer with snap on brick, no codes. Mass air flow, when running showed 5 at idle block learn & integrater 128. Have found prom update. Prom # 9554. very expensive, could this be my problem?
Posted on Aug 01, 2008
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Posted on Jan 02, 2017
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Fig. HO2S1 location "2" on 3.8L
Fig. HO2S2 location "4" on 3.8L
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