I am having a problem with my 86 740 GLE. My first thought was fuel, as there was very little in the tank. I added a couple of gallons and found that I am getting fuel to the rail and into the cylinders. So checked the spark. Nothing. Checked the coil and still no spark. Read a whole bunch of posts on this and traced things to the power stage/ign. amp. As one of the posts suggested, I check for power at the plug to the power stage and am getting the appropriate power at the plug. So I figure it is the power stage that is shot. Is there any way to check and be 100% certain that the Power Stage is the culprit? I don't want to go and spend good money and find out that the problem is something else.

I realize that a new one should be better than a used one. The closest place that carries Volvo parts (Chapman Motors) wants $250 Cdn for a new one and $85 Cdn for a "good" used one. Would a jobber have better pricing on a new one.

Also, just in case, where is the Hall sensor and how does one test it? How much are they worth?

I don't want to spend a whole lot on this car as I got it real cheap and only want a daily driver for the summer. But I have to get it to start before it can be even considered a driver of any sort.

Any further ideas would be very helpful.

Thanks in advance.