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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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I Saw The Crow (Engine Management Light) And Died..Views : 2623 Replies : 30Users Viewing This Thread : |
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May 26th, 2021, 08:50 | #21 | |
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When reading fault codes, you need to retrieve all the codes that section is giving or you only get half the picture of what's happening.
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Jun 10th, 2021, 21:35 | #22 |
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So, the car totally died going round a slow corner a few days ago.
Pos clamp on the battery was sort of snug, but a couple of wires coming off it weren't. So far, since tightening things up, no more ABS, no more crow. Also noticed no battery clamp fitted. I know - I KNOW - you mustn't ever expect a used car to be perfect, but seriously, a flappy around barely hooked up battery!? Best guess, the battery/ wiring moving under braking, exacerbated by the warped brake disc making everything shake, was causing an electrical dropout that coupled to the box/ torque convertor basically going freewheel at lost speeds led to stalling. Of course, the problem could come back, but 100 miles and counting without any signs of it. |
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Jun 10th, 2021, 21:48 | #23 |
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Glad you've found the problem and fixed it! Yes, that will cause those sort of problems but it shouldn't have passed an MoT with an insecure battery. That said, because the battery sits in a well and can't really go anywhere they tend to overlook it on the 7/9xx cars, if in fact they can actually see the clamp is missing.
The big problem there was the loose terminal/leads from it though.
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Jun 11th, 2021, 11:44 | #24 |
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Has anyone asked what engine/car we are dealing with here?
Stalling problem - does it happen only after acceleration? |
Jun 11th, 2021, 12:27 | #25 | |||
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If the engine is turning, so is the torque converter (TC), if the TC is turning, so is the gearbox input shaft and the hydraulic pump within the gearbox. However at low speed, there's not enough speed on the output shaft to keep the momentum of the engine going. It's why you should never tow an auto! Certainly can't tow/bump start them! Quote:
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Jun 11th, 2021, 15:04 | #26 | |
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And no problems on acceleration (other than it being tedious getting up to 30) or steady speed, it was only happening during braking/ low speed coasting. |
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Jun 11th, 2021, 15:10 | #27 | ||
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Jun 11th, 2021, 16:59 | #28 | |
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A specific problem is if the dump valve isn't working. The ECU won't read any airflow until the inlet depressurises, and that can take a few seconds (like 5 or 10s), during that time the engine will stall if you close the throttle and try to leave it with the normal idle mixture, which will be too weak to run. If you keep the throttle pressed a little, or clutch in and rev it up a bit, you can keep it running while it depressurises with the open loop rich mixture. It is actually the closed loop lean idle mode that kills it (usually initiated by the closed throttle switch). I experienced this recently after my dump valve control pipe had rotted out. I had also seen it before in a family members car, who had the turbo reconditioned, but the conditioner damaged the diaphragm. Last edited by TonyS9; Jun 11th, 2021 at 17:04. |
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Jun 11th, 2021, 19:00 | #29 | |
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So far, since nipping up the "But why are they even loose, dear gods was there anything good about this car when I bought it?" terminals, it's been fault free. But if it does it again, I'll start poking around the turbo then. Thanks! |
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Jun 12th, 2021, 08:46 | #30 | |
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