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Adjust idle RPM
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10-29-2018, 11:28 AM | #1 |
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Adjust idle RPM
Hi, I have E92 328i which idles around ~590 and at this idle RPM it shakes slightly. I beleave it started doing that after valve cover and gasket change. When not idling engine stops shaking, even when AC is on it shaks less, because RPM is at ~700. No error codes nothing. So mechanics do not see anything wrong and suggests to adjust idle RPM.
What do you think? How could I adjust idle RPM? |
10-30-2018, 12:36 AM | #4 | |
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Rather than try to increase idle speed through coding of some type, I would try to identify any air leak and fix that. One method of locating a cracked hose that is not capable of easy visual inspection is (with a COLD engine) spray ether/starting fluid on all hoses/connections to the manifold downstream of the MAF and if the idle speed increases when a certain area is sprayed, you have found the leak. George |
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10-30-2018, 10:20 AM | #6 | |
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How could I do it with ISTA D? I was going through it and could not find where to set the value. ISTA D seems more like a manual than the tool where I could set values. Could you tell me where I could set the value? |
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10-30-2018, 04:44 PM | #7 | ||
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Connect your car first of course. |
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11-06-2018, 04:14 PM | #8 | |
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What do you think about DDE software upgrade? Could I do it my self? Or its too risky to do? I have DCAN cable. Done few time coding with NCSexpert, but did not tried updating any ECU firmware with WinKFP before. How do I find correct ECU family for my DDE (MSV80)? |
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11-07-2018, 02:50 AM | #9 | ||
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I personally have never heard of an BMW software update that corrects a rough idle. This all points to a mechanical problem. |
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11-07-2018, 09:11 AM | #10 | ||
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"If your only tool is a hammer, everything looks like a nail."George |
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11-07-2018, 01:35 PM | #11 | |
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https://www.e90post.com/forums/showp...09&postcount=7 I think updating software should be positive thing improve over all performance or reset adaptations which could be causing rough idle... But yes, I also believe that its most likely air leak or other hardware issue... Also its a bit scary to update it myself, I dont want to brick ECU. |
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11-07-2018, 03:16 PM | #12 |
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INPA can program a higher idle speed as well and it is retained. I did this on my car after noticing a slight increase in NVH with new motor mounts.
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11-07-2018, 10:08 PM | #13 |
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Confirm INPA can do it. If I recall correctly it only can be done with car running.
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11-07-2018, 10:12 PM | #14 |
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11-07-2018, 10:17 PM | #15 | |
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In INPA, load up MSV80. F9 System F8 LLABG Add the # of RPMs you want to increase/decrease your idle speed by in all parameters. F9 Program to save the changes. Hope this helps.
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11-11-2018, 03:35 AM | #17 | |
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I noticed that when vibrating on tachometer RPM is showing ~550 and at the same time on INPA it shows ~650, does INPA and tachometer use the same source to get RPM or maybe that indicate the problem? |
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11-12-2018, 10:52 AM | #18 |
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When idling and vibrating on tachometer RPM is showing ~580 and at the same time on INPA it shows ~660, here is a photo:
Does INPA and tachometer use the same source to get RPM measurement? Could this indicate the problem? Am I onto something? Aslo I viewed "Systemtest smooth-running check". It seems that "overall DFT 0.5 motor reference" is sometimes outside of green zone: What does "DFT" stand for? What does this "overall DFT 0.5 motor reference" mean? Could this indicate where is my problem? Last edited by Hotter; 11-12-2018 at 10:58 AM.. |
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11-12-2018, 10:59 AM | #19 |
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yes, but the kombi module has it's own graduations for the needle, and it also smoothes the input so the needle doesn't jump around.
it means your engine is running roughly. find the vacuum leak and stop dicking with your DME. either smoke test the manifold or wave an unlit propane torch around all the intake/lines until you here the idle drop. |
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11-12-2018, 12:11 PM | #20 | |
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I will bring car on Wednesday to mechanic, I will tell to check for vacuum leak. |
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11-12-2018, 12:16 PM | #21 |
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no, it's telling you exactly what you already know, that the motor runs roughly at idle, which is why you wanted to raise the idle, which happened coincidentally to doing the valve cover, which involves removing a bunch of vacuum lines, that are probably now leaking and causing your rough idle.
Does that adequately surmise your situation? The root cause of all of this is something that happened when the valve cover was serviced. Your car most likely has a vacuum leak. Everything that you've seen, felt or heard since that point is likely related to the exact same issue. There is no software or coding solution. Your car has a mechanical issue. |
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