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Started by Berggreen, 08 February 2022, 04:53 AM
Quote from: rumb on 08 February 2022, 10:12 AMSounds like an issue with the WUR. It should start at a higher idle and then decrease as it warms up. Could also be air leaks somewhere. Good video on youtube and also older posts here about WUR.
Quote from: rumb on 08 February 2022, 12:03 PMIt seems to me the bigger issue is the WUR. That is easy enough to work through and eliminate as an issue. One step at a time.
Quote from: rumb on 08 February 2022, 02:27 PMSorry my brain wasn't engaging this morning. I meant to say the Auxiliary Air Valve. AAVhttps://forum.w116.org/mechanicals/is-my-aav-in-order/msg151637/#msg151637https://www.youtube.com/watch?v=aZBGpX9hETc
Quote from: Jan S on 08 February 2022, 05:58 PMThe drop from 1800 to 750 rpms when gear is shifted from P to D is strange ..... can't help you thereI'm also having high idle during warm-up. I have checked fuel system pressure, control pressure cold and during warm up (WUR). I have cleaned and tested the aux air valve, replaced the thermostat. All fine and good now. But idle is still high.Vacuum leaks are next on my list.
Quote from: ethanrmerc on 05 November 2023, 07:23 PMI am having the same exact issue with the difference in RPMs in park compared to drive... Were you ever able to pinpoint this issue?
Quote from: revilla on 26 December 2023, 11:59 PMHiLate reaction here. Maybe this is a closed exchange. But fwiw. I think the behavior described on your first post is absolutely normal for your car. AAV and WUR will promote those high RPMs for about 6-7 minutes especially during winter days when cold air temperature (0-10 deg C) is present. But reduce to about 800 gradually until engine's warm (80-90 deg C). When switching from P to D or R it's normal too the RPMs drop as the transmission is now engaged but breaks are applied so car is still static.I wouldn't worry about the behavior described.
QuoteIt starts perfectly cold, but during warm-up, the idle speed increases gradually and continues to increase until it reaches around 1800 rpm. But as soon as I move the gear selector from P to D, the idle drops to a normal 700-750 rpm.
QuoteI also experience, when the engine is warm, that the rpms drops to a too low level in R, but that I can avoid it by first reving the engine in P and then move to R.
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