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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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slightly higher than normal idleViews : 904 Replies : 21Users Viewing This Thread : |
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Mar 25th, 2020, 09:49 | #1 |
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slightly higher than normal idle
Noticed this morning that my idle seems slightly higher than normal. Its closer t 900 than 750
When stopping at a junction it goes a little higher then settles to 900 ish Any initial idea what could cause this ? Only started this morning
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
Mar 25th, 2020, 09:50 | #2 |
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Just to clarify car is 1996 940 Engine is B230FK
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
Mar 25th, 2020, 11:06 | #3 |
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Was the air-con running Mark? Also is it a while since you've used it? Got a couple of ideas but not sure which is the more likely without the answers to those two questions.
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Mar 25th, 2020, 11:09 | #4 | |
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Car has been used daily and doesn't have air-con
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V70 D5 SE Geartronic 215bhp Saville Grey 2012MY 940 LPT Manual 1996 740 SE 1990 |
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Mar 25th, 2020, 11:38 | #5 |
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Restart
Does it persist after a restart?
For correct idle speed setting the engine has to be warm and being allowed to run a few seconds with closed throttle and stationary car. Sometimes, if the ECU did not have a chance to set idle speed for a long time, my idle speed remains too high as well. If that happens, I can only force it to re-adjust by slightly choking the engine with the clutch to 500 rpm or so. |
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Mar 25th, 2020, 11:44 | #6 | |
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Mar 25th, 2020, 13:02 | #7 |
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My engine is a B200F. No AC. The indicated idle is usually about 600rpm but when I checked with a handheld tach. whilst doing something else it indicated 750rpm. I checked TPS etc. and all was correct so I did not investigate further. Starting quite some time ago the car’s tach. would occasionally indicate about 900rpm at idle but after a few minutes of normal motoring would return to the normal 600rpm indication. I have attributed this to a minor intermittent fault in the tach. or it’s signal and as there does not appear to be any other problems I have not investigated any further.
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Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse. |
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Mar 25th, 2020, 13:43 | #8 |
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RPM indicator
Same here, the RPM indicator sometimes jumps a few hunderd rpm down to indicate a lower speed than the engine is actually running. It is just the tacho and not the ignition, as you do not notice any difference in the actual engine speed. It has been doing this every now and then for many years now, so I am not too bothered about it.
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Mar 25th, 2020, 13:45 | #9 |
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Might be idle control valve needs a clean Mark, I really should do the one on my 940 while it is off the road. In mine if I set of after starting very quickly when coming to a standstill in drive the revs would be that high the car was being pulled along by the engine. If I dropped it in to N it would idle about 1200-1500rpm until I came to a complete standstill for about 5 seconds, then it would slowly come down. However if I start the car up and let it idle for about a minute before setting off it very rarely happens.
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Mar 25th, 2020, 14:00 | #10 | |
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I'll update after drive home
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