91 n/a possible ignition prob - Saab 900 Bulletin Board - Saabnet.com
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91 n/a possible ignition prob
Posted by LM [Email] (more from LM) on Sat, 26 Jul 2003 11:24:47
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91 900S 5 spd 121K - reproducible bucking between 2500-3000 RPM. Worse hot. Weakish low end. Accel strong +3K RPM to redline. Fuel pres steady during bucking. Ignition timing good at idle, but often at steady retard between idle & 3K RPM, then properly jumps/advances +3K RPM. No codes, new tune-up parts including crank sensor, all other sensors good, most circuits V-drop tested, spark plug wires wet/arc tested, coil swap w/similar but not identical VW coil, + more
~3/4" rapid variance in otherwise steady 18" vacuum manifold pres
Ran grounded 5th plug gapped at 4mm, pulled/went thru spark plug leads at dist cap / could not find a stand-out cylinder / bucking still there on 3 cyls
What else besides engine knock, which isn't apparent, might retard EZK ignition? O2 sensor doesn't seem to indicate lean misfire at problem RPM, but perhaps DMM not fast enuf & w/o min/max avg function (looking for used o-scope).
posted by 63.107.25...
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