Date: 16 May 2007 04:22:39 -0700
From: Ludwig <>
Subject: '90 900T -- injector failing?

All of a sudden, as of yesterday, apropos of apparently nothing, maybe 80% of starts result in a solid Check Engine light plus a steadily blinking Shift Up light. The Check Engine light is on 100% of starts now. When Shift Up is flashing, the idle is a regular stutter (not like the variable stutter from a vacuum leak), and there is a regular ticking noise coming from the vicinity of the #2 injector; open throttle is sputtery (as opposed to more violent detonating/ backfiring), and power is noticeably reduced. As if one cylinder is not being fueled. When only the C.E. light is on everything seems normal, even over the course of the 500 miles I drove home earlier today. The two conditions seem to vary mostly by start, not during driving, although the Questionable condition has on one or two occasions turned into the Bad condition within a few seconds of starting. Since there's no detonation and no smell of fuel, my best guesses are that either the injector is failing, or less likely the computer is crapping out in an idiosyncratic fashion. Before I spring for a new set of injectors, is there any less expensive potential fix I'm overlooking? What's perplexing me is why a fouled or failing injector would vary per start but not while driving, unless there's something analogous to a PC's POST routine going on.

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