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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Expected alternator behaviour?Views : 882 Replies : 16Users Viewing This Thread : |
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Jan 25th, 2022, 12:26 | #11 | |
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Location: L/H side
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It Sounds like the constant idle valve isn't working at all to me . I always checked these and adjusted them on every service that I did , I must have done hundreds back in the 90's .. It only takes a couple of minutes .
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Jan 25th, 2022, 12:35 | #12 | |
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Location: Holywood
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I'm sure it can get gummed up, but I've seen cars with blocked oil pumps and totall cruded up engines with fine idle valves. It seems to be the component to blame for idle problems. Its actually a servo, its position is determined by the applied voltage, although it just pushes against a spring. In the auto and AC models it can compensate for sudden signaled loads, it responds immediately to the ECU control signal. They move from closed to fully open every start up and open when moving to closed throttle, its very unlikely for them to get gummed up, too much movement. Its the ECU that takes its time to decide the idle valve position when there are other problems. |
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Jan 25th, 2022, 12:38 | #13 | |
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As you rightly point out the load compensation mentioned is instant because of the reasons stated so should still work instantly. It is an LH2.4 if memory serves but even the LH2.2 compensates idle speed.
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Jan 25th, 2022, 12:44 | #14 | |
Go redblock or go home
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Location: UK
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I found that it had this idle issue once I had replaced the engine, I tried 3 different idle valves on it all of which were cleaned and it made no difference. I then went through the system checking for air leaks and found none, I noticed the TPS was adjusted all the way to one side, so I checked the multiple cars and throttle bodies I have on the shelf and found them all were in the middle. So I did a basic idle setting using the guide on turbo bricks. This massively improved the issue but it would still occur intermittently, unfortunately Alan needed the car back so I didn't have time to sort it once and for all, I personally suspect there is an issue with the throttle body or TPS as why was it adjusted so far out on the replacement engine? So I've said Alan should remove the throttle body off his original engine, clean it up and fit it to see how it goes. |
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Jan 25th, 2022, 14:27 | #15 |
Go redblock or go home
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I forgot to mention Alan said it had a high idle issue similar to this before I replaced the engine so this could be an existing issue that has altered behaviour slightly since the replacement engine.
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Jan 25th, 2022, 22:27 | #16 |
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Last Online: Aug 30th, 2023 18:22
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Yeah, it's just one of her quirks and foibles. Plenty of driving today, lots of stop-start in traffic etc. Idle absolutely fine, even with heated seats, fan, and full beam on. Old TB will go on once I have some time to do it - probably February half term.
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Jan 26th, 2022, 22:57 | #17 | |
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Last Online: Yesterday 17:50
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Location: Gloucester
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It displays the new EN50342-1/6 performance ratings. A genuine lead-antimony battery would most likely be C1,W1. C2,W3 suggests this uses some calcium technology although I suspect not silver-calcium which I believe is most sensitive to lower charging voltages. It begs the question why Halfords also sell a maintenance free “calcium” battery for £10 more. The triumph of marketing over technology I suspect. Anyway, this looks to be quite a solid battery and comes with a three year warranty so I don’t regret the purchase. |
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