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I have a 740 turbo 91. My wife said the the Volvo stalled a few times for no reason. One day it stalled and it would not start again. My son was with her and said some time spark and no spark, more of no spark at the coil. So when I arrived the Volvo started and ran for about one minute and it died. Start no more, towed it home. Same thing happen years ago and it was the "crankcase position sensor" (CPS). So I bought a CPS and no luck. So I tried them both on a friends Volvo and they both worked on his Volvo. So the CPS is not the problem. There is power to the coil and no spark. I have a spare coil and that didn't work also. So what else would prevent the coil from sparking other than CPS, is there another position sensor some where else? Is there a relay or something. Remember there is no spark coming out of the coil.
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If the usual dogs- CPS, power stage - don't bark, here's a longshot but easy to test/eliminate. A grounded tach wire - worn insulation, etc. - will result in a no spark condition.
The tach hooks into either the coil negative side - most common - or in some cases to the power stage.
Try removing the tach wire from the ignition part, coil or stage, and try starting.
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"A grounded tach wire - worn insulation, etc. - will result in a no spark condition." I have only 2 wires that goes to my coil.
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I see you fixed your problem with a power stage, but wanted to respond.
On earlier models - through the 1980s at least - the tach wire connected to the negative side of the coil. The usual configuration was one wire into the positive side of the coil and two wires out the ground side - one to the power stage and one to the tach. On same later models, and I'm not sure when the change took place, the tach wire moved over to the power stage. Same signal, different end of the circuit.
Like I said, it's a longshot, but a really easy test when nothing else is showing up.
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Boxvolvo. Sorry I wasn't able to connect to Brick board till today. I finely got the part in and it starts. I was looking in the parts store and Internet could fine "Power Stage". I called the dealers to compare prices. One of the told me that Power Stage was the old name for them. That's why I could find them on line or parts stores. Power stage = Ignition module (Not confuse with “Ignition Control Module"). That's what you look it under or call it now.
Boxvolvo thanks for you and Lucid saved me a lot of money, you guy are grate.
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Good job of eliminating the CPS as a suspect. Next on my list would be the Radio (noise) Suppression Relay (RSR). For some reason, on turbo cars the RSR controls voltage to the injectors AND the Ignition coil. On non-turbos it's just the injectors. So a flakey RSR (or it's coil ground connection) could be your culprit.
The easiest test is to locate the RSR (it may be identical to the Fan Control relay on the '91). Then unplug the connector and install a temporary jumper to connect the two larger wires, which are RED and GREEN-RED.
If that restores the spark, it's a bad relay or relay ground on the inner fender behind the left headlight.
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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Where would the RSR be located? (I know where the fan relay is located.)
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...I failed to notice that you ARE getting voltage to the coil. So the RSR must be OK.
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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which ignition system do you have Regina or Bosch?
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If you are absolutely certain it is not the CPS, then I would say the next thing to try in the power stage module on drivers inner fender. I had the same issue with my 1991 240, thought it couldn't be the one year old CPS, and it was the CPS.
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power stage module. I'm trying that next.
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Power stage module, what does it looks like or looking for?
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See photo below. I'm not sure what car is shown, but the Power Stage will be on the left side inner fender, up towards the headlight. If you replace it, the new one should be bedded in fresh heatsink paste after cleaning off the heatsink surface.
I think Radio Shack has the paste/compound. Or try googling for it.
NOTE: Ignore my post yesterday on the RSR. I overlooked your comment that the coil was getting voltage like it should. That makes the PS a prime suspect.
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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RSR. I tested it anyway, and I even swopped the electric fan relay with it because the relay is the same, same numbers. I did it anyway because I'm at process of limitation, ruling out by testing. So yes RSR is out. I'm going to try the Power Stage. Thanks for the pic. Heat sink paste what is the purpose for it , what does it do?
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"Heat sink paste what is the purpose for it , what does it do?"
The power stage gets very hot. The heat sink paste gives better heat transfer to the aluminum heat sink the PS is mounted on. Yours is sure to be all dried out by now, possibly leading to the current problem.
It's also known as "thermal grease".
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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Man it looks like dealer item. $$$$
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Not bad at Tasca Volvo...
Item Number MSRP Core Price Price
3501921 $74.50 $0.00 $47.98
Plus maybe $8 or $10 shipping from Mass or Rhode Island
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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The power stage!!! Is the culprit. I plased my PSM on my friends car and it would not start his car. So now I'm going to buy one and I will let you know when it starts.
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Good luck with the new Power Stage. I don't suppose you can get a Bosch locally, but aftermarket brands don't seem to last as long.
Remember to use fresh Thermal Grease.
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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Lucid it starts. I wasn't able to connect to Brick board till today, some days it allow me to connect and some days it show error . I finely got the part in and it starts. It comes with the thermal grease. I was looking in the parts store and Internet and could fine "Power Stage". I called the dealers to compare prices. One of them told me that Power Stage was the old name for them. That's why I could find them on line or parts stores. Power stage = Ignition module (Not confuse with “Ignition Control Module"). That's what you look it under or call it now.
Lucid thanks for you and Boxvolvo saved me a lot of money. Thanks for sticking it out with me, Lucid.
Max62
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