'07 FXDB Sometimes Won't Start When Hot.

[Tom H]

Thank you for that info. I did look at the manual to see where the temp sensor was. I didn't notice anything about testing it, just replacing. I'll have too look again, must be in there somewhere.

Thanks again!
Tom

[Coyote]

Thank you for that info. I did look at the manual to see where the temp sensor was. I didn't notice anything about testing it, just replacing. I'll have too look again, must be in there somewhere.

Thanks again!
Tom

It's in the EDM

[Hossamania]

Throttle wide open at start puts it in flood mode and shuts off fuel, theoretically.

[kd]

The ETS tells the ECM that the engine is getting hot.  The ECM then fattens out the fuel mixture to remove any lean conditions and that typically cools the engine.  It also can cause fuel smell and carbon in the exhaust tip(s).   If the ETS is failing but not to the extreme yet you may get the type of symptom that you are describing (or worse).  The risk is that once started, it can tip over completely at any time and leave you stranded so your quick attention to it is a good thing. 

Because it doesn't throw a code, many just change it.   If you can, do the test procedure as Coyote suggested. If you decide to just change it and it works, all is good.   If it doesn't help, you have a spare to take with you.   Either way, it's  a high probability fairly common item with your symptoms.   Waiting too long may confirm it for you when you're down the road somewhere. 

[Tom H]

If the EDM is the electronics manual. don't have one. Maybe I can search for the specs online.

I decided to order the ETS. As I mentioned. kinda ruling out crank sensor since I was getting spark. Should be here in a day or two.

Unfortunately, this issue does not seem to come up on demand. So it will be just riding it and do some freeway and then stops to see what happens. If it does or does not help, I will update this thread in case someone else has my symptoms and this helps them.

Thank you very much!!!!
Tom

PS: might just be hanging around here a bit. Lots of great info!

[Hossamania]

Good luck, hope that solves your problem.

[Coyote]

If the EDM is the electronics manual. don't have one. Maybe I can search for the specs online.

I decided to order the ETS. As I mentioned. kinda ruling out crank sensor since I was getting spark. Should be here in a day or two.

Unfortunately, this issue does not seem to come up on demand. So it will be just riding it and do some freeway and then stops to see what happens. If it does or does not help, I will update this thread in case someone else has my symptoms and this helps them.

Thank you very much!!!!
Tom

PS: might just be hanging around here a bit. Lots of great info!

[Tom H]

Thank you for the table!!

Tom

[Tom H]

After replacing the engine temp sensor and taking the bike out for a ride that "may" have made it have the issue, so far so good.

"Seemed" to start a bit easier when hot after about a 1/2 hour freeway ride. Tried it twice right away, then about 20 minutes latter twice again. Both times it fired up right away.

Also, when I got home after another 1/2 hour ride, the engine "seemed" to be a bit cooler (with about the same air temps) than it has been. Could just be wishful thinking and my imagination. I didn't seem to feel as much heat off of it at traffic lights. Normally chestnuts seemed to be roasting over an open fire .  Cool down time after the ride seemed to have less pings and pops that it normally has been since I've owned it.

Still...Time will tell if the issue comes up again.

If it does, maybe a sticky injector. Though, the bike runs just fine in all air temps. Except for a tad bit of ping in 6th at about 65mph when I want to make a quick pass in traffic, bit of pinging. Probably should have grabbed 5th. Could also be a lean factory map in the ECU?

I'll update again latter.

Thank you all!!!!!!
Tom

[Hossamania]

Were it an automatic transmission at 65mph in 6th gear and you hammered it a bit, it would have gone to 5th gear and probably 4th right away. The little bit of ping you had was not abnormal.
Good luck, hopefully you got the problem sorted with the new sensor.
Go ride and have fun! (I'm jealous, as it is -2°F right now with 6" of snow today, more tomorrow.)

[Hossamania]

.

[Tom H]

That's what I figured on gear selection, should have grabbed 5th.

Brrrr. Sorry. Glad I'm in So Cal. 40 at night and "I" think "it's" cold.

Thanks again!!
Tom

[Tom H]

I haven't gotten out much due to rain. But I've had it out a coupla times. So far it's been good until today.

Started fine a few times even after a freeway ride that gave it trouble before. Then I headed home with just a city street drive. Shut it down to for a bit to get my gear off and open the garage, maybe 10 minutes. Had the no start issue for a short crank and stinky exhaust. Then the next crank it sounded like it was on one cylinder and stalled. Next did the same. Then it started on the 4th after a short crank. Got in the garage and 5 times in a row it fired up in a turn over or two like it should.

More riding time needed to see what happens. Any thoughts??

Thanks again!
Tom

[Tom H]

An update.

I ended up changing my injectors. Bought a set on fleabay that claimed OEM spec. The originals looked a bit dirty, even though they have maybe 20K miles on them.

Again, not enough test time yet to know it that solved my issue. So far so good though. But the weather has been on the cool side. When the weather warms up, it may get the issue?

I'll update as this latter.

Tom

[tdrglide]

I hate intermittent problems. In my limited experience they have been wiring issue. Weak connection or break in wire inside insulation. Would loose continuity when temps were hot. Found problem with ohm meter and wiggling wires

[Tom H]

Your right. Intermittent issues are a pain. That's why this one is taking so long to be sure the temp sensor or the injectors has solved it.

Could have been as simple as an injector would intermittently get stuck open.

Thank you!
Tom

[Tom H]

Well it appears that new injectors has fixed my issue.

So far it has been fine since I changed the injectors. Even in the heat we have had lately where it would have had it's issue, it's been fine. Only 1 minor hiccup when I shut down, started it right away and then shut down again about 20' latter. Withing about a minute I started it again and it acted like it was missing? Then it quickly cleared up.

Thanks again!
Tom