Strange Idle Issue

[quixitoc]

I've been having some issues with my 2004 FZ6 idling. When I turn it on cold, it idles around 1600-1800 (I set it there, more on that in a bit). I ride it for a bit and the idle stays the same. However, after about 10-20 minutes of riding, it idles around 2500-3000 RPM. After riding for about an hour or so, the bike begins to idle so low that it's at risk of dying out, around 600 RPM. I've raised the idle to offset this, and now it would do the same thing, except at 1000 rpm where I can keep it alive. The thing is, I turn the key off, let it sit for a minute, then turn it back on and it idles back at 1600-1800 again normally, and the cycle repeats. I've checked TPS values using diag mode during every "phase" of this and it consistently shows 16 with throttle closed and 101 with it open, so I don't think its an issue with that. Any ideas? Ive ran a tank with injector cleaner a few times, and throttle bodies have not been synced recently.

 

[Gary in NJ]

Have you seen this thread?

Faulty IACV

Good day! What are the symptoms of a faulty IACV 2005 FZ6N My bike idles at 1600-1700rpm coldstart Then idles 1200-1300 when warm But when i reached 3-4 bars of temp gauge My idle jumps around 1300-1600 rpm and runs a bit hot sometimes rpm hangs around 2k rpm Ive checked for vacuum leak, by...

www.600riders.com

 

[quixitoc]

Have you seen this thread?

Faulty IACV

Good day! What are the symptoms of a faulty IACV 2005 FZ6N My bike idles at 1600-1700rpm coldstart Then idles 1200-1300 when warm But when i reached 3-4 bars of temp gauge My idle jumps around 1300-1600 rpm and runs a bit hot sometimes rpm hangs around 2k rpm Ive checked for vacuum leak, by...

www.600riders.com

Yeah, just looked at that, I'll try to check out that system sometime and sync up the TBs. However, it doesn't address the really low idle after an hour. I'm thinking it could be something with fueling, though, because turning the key off and then on (priming the fuel pump) the idle returns to acceptable levels

 

[Gary in NJ]

Another known problem with the FZ6 that can cause all sorts of problems is a clogged screen on the fuel pump. It might be well worth your time to inspect the fuel pump assembly before going down the “ throwing parts at it” rabbit hole.

 

[trepetti]

Yeah, just looked at that, I'll try to check out that system sometime and sync up the

Have you seen this thread?

Faulty IACV

Good day! What are the symptoms of a faulty IACV 2005 FZ6N My bike idles at 1600-1700rpm coldstart Then idles 1200-1300 when warm But when i reached 3-4 bars of temp gauge My idle jumps around 1300-1600 rpm and runs a bit hot sometimes rpm hangs around 2k rpm Ive checked for vacuum leak, by...

www.600riders.com

Does anyone remember an old thread where someone tore down the IACV? I thought it was @FinalImpact (whatever happened to him?) but I did some searching and came up empty. I am interested in seeing the inside of it, as long as it's someone else's

 

[TownsendsFJR1300]

It wasn't Final impact and was 2-3 years ago.. I don't remember who it was but (I think mentioned/believe), coolant goes thru there. Cold coolant lets the ECU know and raise the idle till warm.

A through cleaning wouldn't hurt.

Checking the rest of the system, as noted, fuel pump, fuel filter, fuel pressure, etc should be done before throwing parts at it..