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#1 firing aboot 45 deg early. Posted by Saabin Bob [Email] (#2813) [Profile/Gallery] (more from Saabin Bob) on Tue, 20 Apr 2021 13:14:40 Members do not see ads below this line. - Help Keep This Site Online - Signup
I'm struggling to figure out what in the world is going on with this car. 1992 900S N/A 'vert. 149K miles.
Fresh fuel, new filter and plugs. Double checked all timing marks carefully, distributor pointed right at #1 at TDC., plug wire order is correct... It will start, and run, but very roughly. My timing light clipped to #1 wire fires about 45 degrees early (over past 2 oclock). Turning the distributor understandably does nothing to change that. I've included a pic to further illustrate what is going on.
EZK has been replaced with a known good unit, as has ECU. I had some difficulty when I changed my crank pulley that caused me to order a new shutter wheel (I'd bent the old one slightly while prying the pulley off.) But AFAIK the shutter wheel can only go on one way, so a misalignment shouldn't happen..... right? But what else could it be? Have any of ya'll ever encountered this situation?
I'm thinking my pocket oscilloscope on the crank sensor might reveal the culprit eventually, but worried that running the motor that far out of time-even for testing- might be detrimental.
Apologies for what may well be a fundamental, basic oversight or misunderstanding, but I am stuck.
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