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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Electrical problem 940Views : 15006 Replies : 314Users Viewing This Thread : |
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Mar 26th, 2020, 08:28 | #41 |
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I can see where you're going with that Ash, certainly a possibility. You forgot to mention to disconnect the field wire from the D terminal though while testing to prevent the alternator trying to charge thin air. For a couple of minutes test, it won't be a problem though, or at least shouldn't be.
Amorack - do you have a NOID light for testing injectors? If not, try and get one, they're fairly cheap and may reveal a fault if it takes that route.
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Mar 26th, 2020, 14:46 | #42 |
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Mar 26th, 2020, 15:36 | #43 | |
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I disconnected lead negative from battery. And tried to fire it. Same problem is still there. And 3k rpm problem. I then disconnected 12+ to alternator and charging lead and fired it. No difference The battery solution with another battery didn’t solve it. But I went through some fuses in the engine bay. I have no idea what this fuse is for. I just checked it. I do follow you guys especially instructions. But I traced down a blown fuse where the battery positive side is. I found out that cable goes to nothing. It’s cut off behind the dashboard. There’s many cables cut right off. No idea why. Same behind the ashtray. Bunch of cables cut off and lies on top of the relays. Last edited by Ammorack; Mar 26th, 2020 at 16:47. |
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Mar 26th, 2020, 16:54 | #44 | |
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As for the NOID light, yes, it would be a worthwhile investment. Fit it (to any injector, it's a batch-fire/full group system so all injectors fire at the same time) and start up, observe the light and bring the revs up slowly to 3000rpm and observe again. Now try to increase the revs while watching the NOID light.
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Mar 26th, 2020, 17:12 | #45 | |
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Mar 26th, 2020, 17:47 | #46 | |
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Mar 26th, 2020, 20:33 | #47 | |
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https://www.ebay.co.uk/itm/Noid-Ligh...I/232393448868 Best price i could find on ebay ^^^^^
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Mar 26th, 2020, 20:56 | #48 | |
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Mar 26th, 2020, 21:07 | #49 |
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Dave is playing with a safe pair of hands here.
Just so everyone understands, we have now eliminated the battery and the alternator as the cause of the problem. The symptoms strongly suggest a fuel cut-out problem and that is what Dave is now chasing. We are starting at one end of the fuel system (the injectors) and will be working backward into the system, step by step. Its important that we do not guess, and that we follow a logical process. Take time, be precise. |
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Mar 27th, 2020, 18:17 | #50 | |
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Smart solution to work from the injector and fuel system. I have ordered that noid light kit. But In the meantime. What else is there to check? It takes a while for my noid light to arrive. So it can be other components to check for? I removed that random cables with those two fuses on positive terminal. |
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