(12-10-2020, 04:08 PM)iamheero_imp Wrote: Hello all,

It's with a heavy heart I write this comment but I'm at my wit's end trying to tackle this solo so far! I believe my 2017 has been afflicted by this nasty IACV issue and it's a real bummer, but it's taken a long time to diagnose because of how intermittent it is. I had put about 22,000 miles on the bike before I had the valves adjusted (not that I noticed any issues, but I felt like it was overdue). While I had that done, I also got my bike professionally tuned by a local shop with a good reputation. Although it rode fine for a while after, things have gotten progressively worse and I think I'm going to have to take the bike in soon.

First, I had very intermittently had issues with high idle as I started the bike (~1800rpm) until it was warmed up, and those were solved with a kill-switch reset. I paid it no mind, really, since it happened like 3 times over the year I was riding it and solved itself generally.

Then I started noticing it would stay above ~1100 rpm even after it should have warmed up and this happened frequently.

THEN I noticed that the RPM would drop to 5-600rpm at idle, rolling up to stop signs and in traffic, and unless I rolled on the throttle immediately, it would die. It would start right up on me, but would die at the next stop sign.

At this point, I tried to remedy the issue myself. I changed the oil and filter early (usually at 5,000mi), spark plugs, cleaned the air filter, cleaned the TPS sensor and checked for kinks, reset the TPS, and while I was at it changed the brake and clutch fluids and replaced the chain and sprockets. I also tried to give it the ol' Italian tune-up, riding with very high RPMs and redlining it for a bit. I tried to seafoam the oil and gas and emptied and refilled the gas tank as well. I tried a tank of 93 instead of the usual regular I use. I would test after each of those fixes and was still having trouble, but eventually it just sorta stopped happening.

The idle at start was high, 14-1500 until warm, but after about 10 minutes of riding it would settle at around 9500 and was *fairly* stable. Less stable than I was used to before all this, and not reading where it should, but it got me around town and felt great when I was in motion. And for about 1000 miles it didn't die on me again, but the weather was getting cooler too at this point and I hear ambient temperature could affect the IACV issues.

So yesterday it was a warm LA day and I went for a ride, it died on me a few times in traffic. Same 600rpm to stall pattern as before.

So the question I have is this: does this sound like IACV troubles? Anything else I can do? Money isn't exactly flowing like water with COVID so if I could avoid giving a shop several thousand dollars to fix a highly intermittent and difficult-to-diagnose problem that'd be great.

(12-11-2020, 11:51 AM)iamheero_imp Wrote: Hi Pdedse,

1) The valves were adjusted! I asked for the actual measurements but when I turned up they just handed over the bike and I was so excited to ride I forgot to get them.

2) The shop that did the valves did the tuning.

3) The tuning was on a dyno and adjusting a Power Commander 5

4) There was SOME hint of it, but it never died before that happened. I had a couple instances where the idle was higher than normal, but nothing lower until after this service.



@Max: I would be interested in bypassing the IACV by disconnecting it after it's warmed up, I have a general idea of where the IACV is but thought it was inaccessible without removing a lot of plastic behind the throttle body assembly? My first instinct was to take it back to the same shop and have them check for vacuum issues. The problem with my setup is it's a very dark apartment garage, no place to actually remove the tank or get any serious work done unfortunately! The previous maintenance I mentioned was all done on the side of the road in front of my building.