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> 940 Turbo Just Dies For No Reason! Help, Car goes dead
jlsmedes
post Jan 1 2010, 06:05 PM
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Location: Louisville, KY
Drives: 1992 Volvo 940 Turbo



I have a 92 940 Turbo which runs great MOST of the time. Once in a while (and its becoming more frequent) the car just up and dies on me at a light or intersection. It goes dead, almost as if it's the alternator. But it's not. I lose steering, brakes, etc. All the dash lights go back on. But here's the weird part, it starts right back up like it's nothing. My mechanics can't figure it out unless it happens when they're in the car. Of course it never happens when they're in the car. Has this ever happened to anyone? It isn't the battery, just changed that. HELP ME! It's annoying and potentially very unsafe. I can't afford a new car. The car is great otherwise only 100K and looks super.
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oldsrider
post Jan 3 2010, 10:32 PM
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The fuel pump circuit in the ECM/ECU might be going bad. There is a long serial number on it, you need to get that number off the box and find one with the same number. I found a few on EBAY when I was searching. Swap them out and see if the problem goes away. A problem like yours is near impossible to find unless the car dies and then stays dead LOL. that circuit needs to stay closed to track it down.
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jlsmedes
post Jan 3 2010, 10:59 PM
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Thank you! That would make it an electrical problem them? That makes sense. Very helpful. Thanks!!
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oldsrider
post Jan 4 2010, 12:05 AM
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I cant say for certain that the ECU is going bad, your symptoms are the same as ones I had in the past. It would be the first part that I swapped out......
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cerbie
post Jan 11 2010, 04:37 PM
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Drives: 93 940



Check your Throttle Position Sensor (TPS) (the home-base shaped black box on the rear of the throttle body). With the car off, you should hear a click as you move the throttle from closed to any open position, then another once fully open.

I can't say it's the same cause, but I just fixed the exact same symptoms in my new [to me] '93 NA. All it was was that switch not closing to tell it that it should run in idle, in which case it operates the Idle Air Control valve (IAC). Removing it and checking should take no more than ten minutes, mainly from fussing with the throttle tie-rod ball sockets, and, if you have cruise control, the top bolt on the throttle body.

Likewise, it could be the IAC itself, if it's not that or the ECU.
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docmot
post Jan 26 2010, 08:41 PM
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I had the exact same problem last summer and it turned out to be the power stage unit. There is a great reference floating around, "Diagnosing no starts for the 940" that pointed me right to it. You will need a multimeter to do the checks. If I can find the link or the file, I will post it up here for you.
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SykO
post Jan 27 2010, 05:10 AM
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the power stage also known as ignition amplifier ... its a bosch part, relatively cheap and really easy to change. fails between 100k and 175k miles usually. i have mentioned it before, do a search on the site here as i have mentioned it a fair few times.

M
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SongBird12
post Jan 27 2010, 10:02 AM
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Drives: 1993 Volvo 940 Turbo



The same thing happened to me - I replaced the fuel pump relay located behind the ash tray - runs like a charm now. Hope this helps!
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