Dyna dying at idle
#11
11-26-2016, 11:50 AM
To add my 2 cents I think maybe your Throttle Position Sensor may be at fault. The computer may not know when you close the throttle so it doesn't try to adjust the IAC that first time. When you start the engine the computer runs in an open loop and preset for cold start and fast idle. It bumps the IAC a bit and ignores the throttle. That's why your problem only shows up on the first stop light. Remember your TPS spends most of it's life at closed throttle and it's just a variable resistor. So just like your old stereo volume control, it can develop a dirty spot where the reading is unreliable. Remember the scratchy volume control on that stereo? Since the bike does go to fast idle then adjusts idle later I doubt the IAC is at fault or sticking.
One cheap and easy thing to try is to remove the air cleaner to expose the TPS electrical connector. Push the tab and pull it loose. Then use some Electrical Contact cleaner ONLY to clean both male and female contacts. Mate and unplug the connector a couple of times and finally plug it back in. That won't address the problem if the TPS is in fact bad but a common problem with HD FI are those electrical contacts get dirty and cause all kinds of problems.
CRC QD Electrical Contact cleaner at Home Depot works very well and is safe around plastic.
CRC QD Electrical Contact cleaner at Home Depot works very well and is safe around plastic.
#12
11-27-2016, 07:43 AM
#13
11-27-2016, 08:32 AM
Yeah there are a bunch of sensors and we haven't even touched on the O2 sensor in the exhaust!
But once you learn what each sensor does it becomes a lot easier. I had to learn them working on cars. I'm an old carburetor guy myself. But I love the modern FI because of how it works to constantly adjust fuel air ratio. Starts no matter what the outside temp is or how long it's been sitting, and whether I'm at Sea Level or up in a mountain it runs great.
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chief08 (11-27-2016)
#14
11-27-2016, 10:11 PM
been there
OP,
I've been down this road on my 07. I took the time to check the TPS and lots of other things. I wish I had listened to my first instinct from thirty years of working on cars and replaced the IAC first. It would have saved a lot of headaches.
It took me about 1.5 beers to replace the IAC after a couple of cases of ruling out all of the other suspects.
I've been down this road on my 07. I took the time to check the TPS and lots of other things. I wish I had listened to my first instinct from thirty years of working on cars and replaced the IAC first. It would have saved a lot of headaches.
It took me about 1.5 beers to replace the IAC after a couple of cases of ruling out all of the other suspects.
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fxdup (04-15-2019)
#17
11-28-2016, 05:52 PM
#18
11-29-2016, 07:02 AM
Outstanding HDF Member
One cheap and easy thing to try is to remove the air cleaner to expose the TPS electrical connector. Push the tab and pull it loose. Then use some Electrical Contact cleaner ONLY to clean both male and female contacts. Mate and unplug the connector a couple of times and finally plug it back in. That won't address the problem if the TPS is in fact bad but a common problem with HD FI are those electrical contacts get dirty and cause all kinds of problems.
CRC QD Electrical Contact cleaner at Home Depot works very well and is safe around plastic.
#19
11-30-2016, 06:56 AM
Road Captain
#20
12-03-2016, 01:15 PM