In the past year I've acquired a 1994 Volvo 940 T sedan and I'm currently in the process of returning to stage zero before going nuts, the issue I was having was intermittently seeing all the dash lights turn on, total engine power loss, and the power steering and brakes would hardly work. There are a few steps I've seen online to why this is happening, but here is my process and how it was fixed! (In case anyone else is pulling hairs out with the same issue)
- Vacuum Hose, there was a well worn vacuum hose toward the back of the engine that was put back together and it seemed to allow the engine to run a bit smoother, you could definitely feel the boost kick in a bit smoother as well, but it would still end up dying.
- CPS/RPM Sensor, this swap from the old, tattered sensor made a huge difference, previously when I gave a bit more throttle during my trip, whether it be a 10 minute drive or a 4 hour drive, would end up killing it when I would slow back down or stop completely and idle. Changing the sensor allowed me to go a bit harder on the throttle, but would still intermittently die, just way less.
- Fuel Pump Relay, the car still had the original from 1993 with the white relay, but it appeared there were micro cracks and it would need to be re-soldered, so popped in a new one and so far zero issues, granted it's been 4 days of rather hard driving, not a single mishap so far, knock on wood.
Beyond this, I've heard the power stage could be the culprit, but it sounds like each case is different online. Hope this helps anyone else trying to keep the bricks going!
- Vacuum Hose, there was a well worn vacuum hose toward the back of the engine that was put back together and it seemed to allow the engine to run a bit smoother, you could definitely feel the boost kick in a bit smoother as well, but it would still end up dying.
- CPS/RPM Sensor, this swap from the old, tattered sensor made a huge difference, previously when I gave a bit more throttle during my trip, whether it be a 10 minute drive or a 4 hour drive, would end up killing it when I would slow back down or stop completely and idle. Changing the sensor allowed me to go a bit harder on the throttle, but would still intermittently die, just way less.
- Fuel Pump Relay, the car still had the original from 1993 with the white relay, but it appeared there were micro cracks and it would need to be re-soldered, so popped in a new one and so far zero issues, granted it's been 4 days of rather hard driving, not a single mishap so far, knock on wood.
Beyond this, I've heard the power stage could be the culprit, but it sounds like each case is different online. Hope this helps anyone else trying to keep the bricks going!
