2008 Super Glide Custom Undiagnosed Misfire
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Novice
Joined: Sep 2020
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From: Illinois
2008 Super Glide Custom Undiagnosed Misfire
13000 miles on it. This bike ran OK when I got it, but it went downhill early in the year. Can't run at 25 to 35 MHP without a constant misfire, and jerking.
My local dealer put it on the computer and diagnosed it as bad oxygen sensors. Replaced those and plugs, but no improvement. Took it back and was then diagnosed with likely bad fuel injectors. Replaced injectors and it runs about 90% better. Still having the misfire though when cruising in town at 25 to 35 MHP, but significantly less. Thinking about trying a new temperature sensor, but no codes for that. Fuel pressure is OK at 58 PSI with no leaks.
Anyone had a similar problem and figured out how to fix it? Not having an enjoyable experience yet with my first Harley.
My local dealer put it on the computer and diagnosed it as bad oxygen sensors. Replaced those and plugs, but no improvement. Took it back and was then diagnosed with likely bad fuel injectors. Replaced injectors and it runs about 90% better. Still having the misfire though when cruising in town at 25 to 35 MHP, but significantly less. Thinking about trying a new temperature sensor, but no codes for that. Fuel pressure is OK at 58 PSI with no leaks.
Anyone had a similar problem and figured out how to fix it? Not having an enjoyable experience yet with my first Harley.
Tourer
Joined: May 2016
Posts: 318
Likes: 124
From: Alberta
I've seen a pin hole in a fuel line inside the tank do that , yes it will still show proper fuel pressure on a guage , the problem shows itself as a drivability issue . The fix is to carefully remove the top cover from the fuel tank , start it and using caution , look inside at the fuel lines for a pin hole which will have pressurized fuel spraying out . Not a good time to be lighting a cigarette while doing this .
I've fixed more than one stumbling piece of **** this way.
I've fixed more than one stumbling piece of **** this way.
Last edited by Gearhead88; Sep 12, 2020 at 10:02 PM.
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Novice
Joined: Sep 2020
Posts: 20
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From: Illinois
There is some backfiring when letting off throttle and downshifting. Don't know how much of that is normal?
Thread Starter
|
Novice
Joined: Sep 2020
Posts: 20
Likes: 2
From: Illinois
I've seen a pin hole in a fuel line inside the tank do that , yes it will still show proper fuel pressure on a guage , the problem shows itself as a drivability issue . The fix is to carefully remove the top cover from the fuel tank , start it and using caution , look inside at the fuel lines for a pin hole which will have pressurized fuel spraying out . Not a good time to be lighting a cigarette while doing this .
I've fixed more than one stumbling piece of **** this way.
I've fixed more than one stumbling piece of **** this way.
I do hear a fuel trickling sound when the fuel level is low, but was told there is an overflow that causes that sound, so I haven't checked into that anymore. Also, the fuel pump makes an occasional strange grunting sound when the switch is turned on. I wouldn't think that is normal.
Tourer
Joined: May 2016
Posts: 318
Likes: 124
From: Alberta
I did a lot of research and came to that conclusion earlier in the year. Took the top of the tank off to check for leaks or a blown oring, and found out that mine is made different than any of the videos I saw online. I couldn't figure out how to get the pump, etc. out. That was before I bought the service manual. Everything looked clean and like new from what I could see. Not old and brown.
I do hear a fuel trickling sound when the fuel level is low, but was told there is an overflow that causes that sound, so I haven't checked into that anymore. Also, the fuel pump makes an occasional strange grunting sound when the switch is turned on. I wouldn't think that is normal.
I do hear a fuel trickling sound when the fuel level is low, but was told there is an overflow that causes that sound, so I haven't checked into that anymore. Also, the fuel pump makes an occasional strange grunting sound when the switch is turned on. I wouldn't think that is normal.
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