'07 Idle Issues
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
I hate saying this but try to do a search on the issue. Tons of threads and you might find something. I got nothing right now.
Intermediate
Joined: Jun 2010
Posts: 36
Likes: 0
Yeah, I replaced the IAC last week after cleaning it didn't help. After that didn't fix it, I started scouring the interwebs for more info. Then I ordered the Throttle position sensor and put it in today. The problem is still there.
Thread Starter
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Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
You've covered the IAC, TP, and checked the items suggested in the SB (idle screw position, etc.). The only thing that I can think of that remains is a fuel-pressure loss. The internal fuel hoses are known to leak and produce a pressure loss, and if bad enough can affect performance. Sometimes it's so bad you can hear it (hissing noise) and see the swirling gas in the tank as it is ejected from the fuel lines. Check that next, which may involve a connecting a fuel-pressure gauge to the line.
When I was having my idle and misfiring issues, which ended two years ago when I changed the TPS, I checked the fuel system thoroughly. The hoses weren't leaking, but the juncture between the FPR and pump had warped and fuel pressure was leaking there. I replaced the FPR and hoses, but although that wasn't causing the symptoms it would've caused trouble eventually.
When I was having my idle and misfiring issues, which ended two years ago when I changed the TPS, I checked the fuel system thoroughly. The hoses weren't leaking, but the juncture between the FPR and pump had warped and fuel pressure was leaking there. I replaced the FPR and hoses, but although that wasn't causing the symptoms it would've caused trouble eventually.
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
https://www.hdforums.com/forum/dyna-...fuel-line.html
Intermediate
Joined: Jun 2010
Posts: 36
Likes: 0
Gents, thanks for the responses.
I did notice that when turning the ignition on and the system primes by drawing fuel, it sounds a lot louder than normal. Also, the bike is hissing and spitting when it dies. I'm assuming that I can rev it because the suction at higher RPM's is stronger than the leak. As far as I can tell, the problem is only getting worse.
Now off to buy a fuel pressure gauge.........any suggestions?
I did notice that when turning the ignition on and the system primes by drawing fuel, it sounds a lot louder than normal. Also, the bike is hissing and spitting when it dies. I'm assuming that I can rev it because the suction at higher RPM's is stronger than the leak. As far as I can tell, the problem is only getting worse.
Now off to buy a fuel pressure gauge.........any suggestions?
Seasoned HDF Member
Joined: Mar 2007
Posts: 66,948
Likes: 4,573
From: TOAK western branch
I would pull the pump out and take a look. The correct gauge is pricy. You should be able to see if some think isn't correct. First remove the fuel cap with the bike off and look in the tank as you turn the ignition switch on. If you see a lot of fluid splashing chances are you have a pin hole in the line or a bad o ring on the regulated. Filter service interval is 20k.
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Road Warrior
Joined: Mar 2010
Posts: 1,441
Likes: 48
From: Eastern N.C.
don't know if this is your problem and I did not read all of the post. this is what fixed mine with high and low idle spit back and such. pressure regulator in the tank. mine is 07 sg. $93.81 and no more problem. labor was 52.50 this was done 8/16/12 and I'm a happy fellow. hope this helps and good luck.
kroozeabout.
kroozeabout.
Intermediate
Joined: Jun 2010
Posts: 36
Likes: 0
Right on. I'm going to peek in the tank when I turn the ignition on - see what I can see.
The bike is at 18K so I might as well change the fuel filter while I'm in there along with submersible hoses.
Sawyer, thanks for the input. My only question is how can I diagnose it myself if it is the regulator?
The bike is at 18K so I might as well change the fuel filter while I'm in there along with submersible hoses.
Sawyer, thanks for the input. My only question is how can I diagnose it myself if it is the regulator?