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Thanks for reading. My '92 240 wagon has had this problem since I got it, sometimes worse than at other times.
When starting, especially cold, it gives all the signs of the ignition being too advanced - ie, as the piston gets to the top on compression, it seems the plug fires just a bit before it gets over the top, and it works against the starter and stops the engine turning. The sound is urr-up| urr-upp| etc. It eventually starts, but it's hard on the starter, the battery, and the nerves.
Before I found out just what's involved in the firing with this ignition system, I actually tried defeating the (almost) foolproof distributor clamping and retarded the distributor setting. Needless to say, to no avail - it's back where it belongs now.
With the points ignition systems with I've dealt for most of my life, this simple retardation would fix the problem immediately - the engine would spin over the compression TDC and start right up. But with Barbie the Volvo, no such possibility. I'd really like to correct this little problem, but I don't know where to start. (Sorry!)
I know how the system works, now. The Power Stage pops a pulse to the coil when triggered by the ECU. The ECU sends its trigger pulse around the signal it gets from the CPS on each turn of the crankshaft. When the engine's running, the ECU changes the timing of the pulses depending on input according to throttle setting, engine temperature, rpm, knock detection and possibly another parameter or two I'm not considering just now. Most of these act, I'm thinking to advance the timing just enough to avoid knock. But it appears to me that the ECU is getting advice to advance the timing when the engine is just cranking on starting, and I need to get it to settle down a tad. Any advice would be highly appreciated.
tnx,
ps
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