» Site Navigation | | » Recent Threads | 1999 M3 Swap 09-07-2023 10:10 PM 06-01-2024 03:04 PM 7 Replies, 409,541 Views | | My 318ti build 05-21-2024 04:48 PM 05-28-2024 06:42 PM 1 Replies, 3,295 Views | | OMG!OMG! 05-28-2024 08:53 AM 05-28-2024 08:53 AM 0 Replies, 1,266 Views | | | | | 10-28-2018, 02:43 AM | #1 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | Slow rpm drop to idle Having an issue where rpm takes several seconds to fall back down to idle. It takes rough 3-5 seconds to fall from 3-4k back down to idle. I just replaced the ICV with a brand new unit today, was hoping that was the culprit since i had an icv blocked code. That was the only code i had too. Any ideas? Sent from my iPhone using Tapatalk | | | 10-28-2018, 04:48 AM | #2 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | https://youtu.be/NcGEHIMrErw Heres a video to help depict the issue Sent from my iPhone using Tapatalk | | | 10-28-2018, 04:54 AM | #3 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | https://youtu.be/NcGEHIMrErw And heres another issue. Not sure if the two are related Sent from my iPhone using Tapatalk | | | 10-28-2018, 04:55 AM | #4 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | https://youtu.be/c1Lb9B3c9vc Sent from my iPhone using Tapatalk | | | 10-28-2018, 09:21 AM | #5 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | https://youtu.be/I0TXGySg3YY Sent from my iPhone using Tapatalk | | | 10-28-2018, 08:52 PM | #6 | Senior Member Join Date: Aug 2008 Location: San antonio, tx Posts: 135 | You might try cleaning the connections to the throttle position sensor. I had an issue with a fluctuating idle, which dropped too low, and that cured it. Not the same, but could be a common cause. | | | 10-28-2018, 08:57 PM | #7 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | I can give it a try. I pulled codes again this morning and found: P0170- fuel trim bank 1 P0335- crankshaft position sensor A circuit I also read that a bad MAF may cause these issues. But im open to any and all suggestions. Sent from my iPhone using Tapatalk | | | 10-29-2018, 08:49 PM | #8 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | Update: last night after the car had been sitting for a good 7 hours. I decided to start it, and while at idle i unplugged the MAF. As expected the car idled terrible, and nearly stalled. But when i reconnected the MAF, idle was perfect, rpm was dropping perfect, and it drove perfect. Still today, even after sitting all night its driving perfect. I have no idea what this means. Its as if by unplugging the MAF And reconnecting it, it somehow reset somthing and the car drives great now. Dont know how long it will last or what parts need to be replaced to maintain this result. Sent from my iPhone using Tapatalk | | | 10-30-2018, 06:40 PM | #9 | Senior Member Join Date: Nov 2014 Location: California Posts: 215 | Another whole day with everything running perfect. Only problem im still having is the hard starting. Sent from my iPhone using Tapatalk | | | 11-09-2018, 08:34 AM | #10 | Junior Member Join Date: Nov 2018 Location: Perth Western Australia Posts: 21 | It could be you have improved the MAF connections by the unplug-replug process. A trick that works with the E32 is to disconnect the battery and then join the cables (not the terminals)n together. This erases the learnt part of the ECU programming. Sometimes it works, sometimes no difference but it is a cost free process. Let the wires shorted out for an hour or so. Sorry - you will have to reset the clock and radio. | | | | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |
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