Well, my problem seems to have gone away. I believe it was some kind of weird electronic interference, as far-fetched as this sounds. I noticed the signal and ground wires to the crank position sensor weren't twisted together helically within the wiring harness. (I assume they should be - this is th...

So, the mechanics at the dealership came up with a bizarre, yet plausible theory: The operation of the starter motor is creating electromagnetic interference in the crankshaft position sensor signal to the ignition control module. This is what's causing the car to not spark while cranking, but run f...

Well, I went to pick up my 850 from the dealer, and conveniently, it wouldn't start again. They pushed it into the shop, and are investigating the cause of the no spark condition right now...

Thanks - I'll investigate this next time I run into the problem. Your theory sounds as good as any I've heard. At the moment, my 850 is starting normally. After not being able to start it for about a month, nor being able to find the source of the no-spark issue, I decided to give up and let the pro...

Update: Still no progress To summarize: My '94 850 will crank, but not start. For a while, this problem was intermittent, and once it started it would run perfectly. However, now it's in my driveway and won't start. The DI power stage/ignition coil module is not receiving a pulse from the ICM. The f...

The main relay's good. I borrowed my father's 850 (same year, but with a turbo) to compare. I noticed my Volvo's cranking very slowly. I initially assumed the battery was run down from so much cranking, but after attaching jumper cables to my father's running Volvo, it still sounds sluggish. This ma...

I checked the battery with a voltmeter while cranking, voltage stayed above 10 volts for 15 seconds (which should indicate a good battery). So it's probably not the battery or the starter motor. Nice theory, though. I've observed that the tachometer doesn't move while cranking - might this indicate ...

I've verified that the cam position sensor and RPM (crank) sensor both work. The fuel injectors are not pulsing, but I'm under the impression that they are disabled when the computer detects a no-spark condition, so this is probably a red herring. Other than the cam and crank sensors, what could pre...

Hmm. Is it possibly that an intermittent signal might prevent a start but not throw a DTC? I verified that the fuel injectors are getting battery voltage - the ground just isn't getting switched on by the ECU. I'm going to double check this tomorrow, it was the last test I did, and it was a little d...

My 1994 850 non-turbo will intermittently crank but not start. Sometimes it starts on the second or third try, other times it takes up to ten minutes. Once it starts, it runs perfectly. I've checked the primary and secondary ignition systems. There is no spark - the ignition module (on the driver's ...