Date: 18 Mar 2002 20:45:29 GMT
From: Dave Wysocki <>
Subject: Re: HELP with Ignition prob

My first guess would be the hall-effect sensor in the distributor. On my '84 900 S, this had a thermal intermittent - a real pain to diagnose. I think the '85 900 T used these as well: it gives the crank position to the ignition control module, so that the ICM knows when to fire. While it can be replaced, the part is hard to get and it's usually easier just to put in a used distributor assembly. The fact that the tach suddenly quit working would indicate the hall-effect sensor, but that the car continued running until you shut it off argues against it - although it could be that the sensor failed with its output in a fortuitous state (high or low). The ignition control module would be another good bet, except that it is giving you spark from the coil. Dave Wysocki '93 9000 CSE T 200K miles '84 900 S 420K miles (RIP) Message by Chip Thompson <> on: 3/17/2002 6:09:21 AM >OK, this is a good one (1985 900 T) > >Car starts fine at airport after sitting 4 days. Stopped to top off tank >(93 octane) and wash off road dust. Driving down the road, I notice the >tach suddenly quit. Car still running, I pull into Wal-Mart to pick up some >stuff. When I return to the car, it cranks and cranks but won't fire. >Battery is strong, starter is engaging, engine is turning fine, but (it >seems) no spark at all. Checked all leads and obvious wiring, still no >start. Without an assistant, I could not check the actual HT leads to see >if spark was being generated, but what thoughts does to group have? Any >help appreciated. Thanks > > >

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