Re: 92 2.1 lean mixture - Saab 900 Bulletin Board - Saabnet.com
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Re: 92 2.1 lean mixture
Posted by KeithG (more from KeithG) on Wed, 24 Apr 2002 09:54:19
In Reply to: 92 2.1 lean mixture, steve, Wed, 24 Apr 2002 09:40:41
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Is the 02 heater making connection, getting 12V? Was the check of voltage made 'in circuit' if so, it may be a bad ECU as it should force the o2 lead to 0.6V steady until the 02 heater comes up to temp and it starts fluctuating. Disconnecting and checking the O2 really does not check anything. You may want to check the main signal leads for voltage according to the LH FAQ. All checks are 'in circuit' and compared to ground (use a digital MM - high input impedance). Also may want to check that the engine is at the same ground potential as the battery negative (bad ground strap to engine)
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