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  #1  
Old 13th December 2019
rzirasch rzirasch is offline
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Sportster/Buell Model: 883 l
Sportster/Buell Year: 2012
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Default 2012 883 miss that comes and goes

Hello all,
Have a 2012 883 super low with 4000 miles on it.
the bike seems to have a miss on the rear cylinder that will go away and come back again. You can feel the miss when you place your hand against the end of the muffler and feel the output. It will run like crap going to work then be fine for a day or so and start running bad again.
The bike is throwing no error codes.
Here is what i have done so far..
Installed new plugs
Checked ohm readings on the wires they were in the middle of the ranges listed
Emptied tank and put in fresh gas. (Figured it was cheap and easy)
Load tested battery and checked battery connections, ground connections, connections to injectors seem good and tight.
Tank vent tube is not kinked
Checked for an intake leak using starting fluid (No RPM change)
Was going to pull off the tank and check ohm readings of the coil. did not see any ohm reading specifications. this is the newer 4 pin connection. Have to pull tank to get to the connection. (Do not have another coil laying around and do not believe in just swapping out parts)
Do not see it being a clogged fuel filter since a clog would not go away and come back.

If anyone has any suggestions on something I overlooked or can point me towards ohm readings for the coil it would be appreciated.
Thanks
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  #2  
Old 16th December 2019
tussuck tussuck is offline
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Default

Also check...
- Throttle position sensor as these wear so if your in cruise mode then you get an intermittany miss. I have not seen this error throw any codes either.
- AIC valve could be worth cleaning, easy to do with the air filter off and bike running
- Crank position sensor might be going...
- Worth at a minimum unplugging the connectors to the above and clean them with something like Contact Cleaner spray.
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  #3  
Old 16th December 2019
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NLXL NLXL is offline
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A sticky valve from carbon deposits? Try a compression test and compare it to the front cylinder.
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  #4  
Old 17th December 2019
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Default

Here's the Sportsterpedia seaction on the CKP sensor & it's importance in engine operation:
http://sportsterpedia.com/doku.php/t...shaft_position

Make sure to remove & clean the under-frame connector & fully reconnect it - Also make sure the CKP sensor itself is not deformed from heat or other damage - Remove & clean.


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  #5  
Old 18th December 2019
XLtimes XLtimes is offline
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Default

I also had an intermittent miss, drove me nuts especially when trying to Autotone with the Powervision on my 13 Iron. Checked plugs, wires, O2 sensors, CKP, IAC etc. While looking at the IAC I noticed the yellow clip on the TMAP sensor (right behind the IAC) didn’t look quite right. Come to find out the connectors weren’t plugged in together 100%, and the retaining clip wasn’t latched. Long story short, I reconnected the ends, secured the clip and the issue I had been chasing for weeks was miraculously solved in thirty seconds. I was in shock that the cure for my bike was so simple.

Hope your story has a happy ending and you get it resolved, hang in there!
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  #6  
Old 18th December 2019
rzirasch rzirasch is offline
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Hello all,
Thank you for the replies. Have been in the hospital the last week so i will update when i am back on my feet. Appreciate the input! Ride safe
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  #7  
Old 18th December 2019
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How about the oil?
This bike still have the original oil?
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