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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 : 14995 Replies : 314Users Viewing This Thread : |
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Mar 15th, 2020, 18:28 | #1 |
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Electrical problem 940
Lately my 1994 940 B230fd got problems with the electricity or something like that. When I turn off headlights, the engine starts to go rough and doesn't like it. So is the heater for rear window.
Whatever it is. It’s driving me crazy. |
Mar 15th, 2020, 18:55 | #2 |
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Do you mean when you turn the headlights on?
Sounds alternator related to me |
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Mar 24th, 2020, 18:04 | #3 |
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I mean when I turn my headlights ON. The rpm is more stable with load on. I had to drive with heater on rear window and heater fan on max to have stable rpm. But now my rpm is everywhere and it’s backfiring and too rich and lean mixture
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Mar 24th, 2020, 20:06 | #4 |
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You have a serious problem there that you're unlikely to find by yourself, even with our help.
Why did you mess about with the TPS? It's nothing to do with the charging system, neither is anything else you've changed but you don't seem to have changed the alternator? First of all, do you get the charge warning light when you first turn the ignition key to position 2 without starting it?
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Mar 24th, 2020, 20:30 | #5 | |
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I tested another alternator from a 940. It made the engine worse. It wouldn’t rev past a certain limit. I knew that answer would come. This nut is hard to crack. |
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Mar 24th, 2020, 20:47 | #6 |
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Is that certain limit about 3000rpm and when it gets there, does it die and then rev up again?
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Mar 15th, 2020, 19:37 | #7 | |
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good luck, Kay |
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Mar 17th, 2020, 11:24 | #8 |
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Mar 17th, 2020, 12:52 | #9 |
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Check the alternator earth strap, these often fail, even if it looks alright. You'll probably find the missing 0.15V between the alternator casing and the engine block with your voltmeter, indicating the earth strap is failed/failing.
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Mar 17th, 2020, 16:39 | #10 | |
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Quote:
The problem is that I don’t find the ground for engine. |
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electricity, issues |
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