92 900 turbo, intermittently rich; AMM test results - Saab 900 Bulletin Board - Saabnet.com
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92 900 turbo, intermittently rich; AMM test results
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Posted by Ken H [Email] (more from Ken H) on Tue, 26 Sep 2006 14:57:17 Share Post by Email
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Hi everybody,

My 92 turbo is still sputtering out periodically. I hooked up a voltmeter to the o2 sensor and it is running rich under light acceleration (hangs at .9 V), then sputtering out when I lift the throttle, usually when the car has been driven for a while. When I drop back to idle the o2 circuit starts functioning again.

Just replaced the o2 sensor, FPR, turbo bypass valve - no fix. The TPS checks out, as does the NTC sensor, and EVLD system. I also checked all the vacuum lines and devices, and removed all the rubber boots and aluminum pipes between the turbo and the intake to look for cracks.

I replaced the AMM with a rebuilt one right after the symptoms started (about 3 months ago). Today I backprobed it at pin 3: 2.2 volts at idle, got up to 4 volts during some brisk acceleration. Are these results normal? I think I remember reading 1.5 V at idle? SHould I be thinking about my ECU?

Any other suggestions? This is driving me crazy! Thanks, Ken H

posted by 128.210.6...

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