Help me. 99 Dyna Super Glide...Pig slow.
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Road Captain
Joined: Oct 2010
Posts: 521
Likes: 3
From: Colorado Springs, Co.
Just looked through Rene's list of wiring diagrams, he didn't have a 99 but he did have an 01. That diagram shows a MAP (Manifold Air Pressure Sensor in Harleynese) is used with a carbed bike. If it isn't reading properly it may not be telling the ignition to advance under load. Good luck, this **** sucks to figure out.
I wonder if this bike has VOES? I thought about this cause I had a similar problem with an old Ironhead I had.
Just to clarify, the bike is NOT misfiring, sputtering, backfiring, nothing. It's just incredibly weak under load.
IT's still way too damn cold to work in my garage. I need a heater damn it.
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Road Captain
Joined: Oct 2010
Posts: 521
Likes: 3
From: Colorado Springs, Co.
I fixed it!!!! Thank you to the last poster for giving me the idea to look at the MAP sensor. Back probed it, and took bike on a test drive with my Fluke attatched. Map voltage stayed at 4.5V throughout entire RPM range, so I knew right then that was an issue. Unplugged MAP sensor, and it was like night and ****in day.
The MAP was electrically stuck closed, telling the igntion module that the engine was at high vacuum all the time, thereby retarding the hell out of the igntion timing, hence the severe power loss.
Oddly, Harley uses GM MAP sensors. I had a few lying around in my tool box that I use to test cars with, and bike runs like a sexually assaulted primate now. (can no longer say Raped Ape, it's not PC).
If I could have carried my labscope on my lap, I would have gotten you guys before and after waveforms to show the difference.
The MAP was electrically stuck closed, telling the igntion module that the engine was at high vacuum all the time, thereby retarding the hell out of the igntion timing, hence the severe power loss.
Oddly, Harley uses GM MAP sensors. I had a few lying around in my tool box that I use to test cars with, and bike runs like a sexually assaulted primate now. (can no longer say Raped Ape, it's not PC).
If I could have carried my labscope on my lap, I would have gotten you guys before and after waveforms to show the difference.
Road Warrior
Joined: Jul 2009
Posts: 1,745
Likes: 1
From: A house.
Right on! Good job getting it repaired and I appreciate your run down on the specifics, this is good info to keep filed for future reference. That map sensor has been the culprit in more than a few puzzling issues.
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Road Captain
Joined: Oct 2010
Posts: 521
Likes: 3
From: Colorado Springs, Co.
BTW, Go Air Force!
Airman 1st class Reservist here, 310th Security Forces.
Road Warrior
Joined: Jul 2009
Posts: 1,745
Likes: 1
From: A house.
HAHA! Thank you for your service Bro, Stay safe!...and to all the Army, Navy, Marines and Coast Guardsmen, US and Allied Forces, I love and thank you all for your service too. Stay safe, everybody.
Cruiser
Joined: Nov 2010
Posts: 184
Likes: 2
From: Illinois
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Road Captain
Joined: Oct 2010
Posts: 521
Likes: 3
From: Colorado Springs, Co.
Me and carburetors don't get along lol. I cut my teeth on fuel injection and computers/electronics. That's what I know how to diagnose and how to get power from.
I guess that's cause I'm only 31.
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