how do you clean the Idle Air Control 06 SG
#21
I have a fully stock 2006 efi Heritage softail. The backfiring only occurs intermittently. Hot or cold. Only does it when starting the motor, about once out of ten times. The IAC was not dirty and moving freely. The IAC does not move when I turn on the key. It only moves up and down a couple of times when I shut off the motor, and appears to stay in the open position when off. If this is not the source of the backfiring, what could be doing it? The bike idles fine and never backfires at any other time.
Any way I checked the injector for any drip at shut off and there is non. My compression is perfect so I know no valves are leaking. My plugs look great even after 10K on them pulling them after a 20+ mile run on the interstate. What I think and why it only happens randomly is dependent on how the engine position of the pistons ended on the last turn off. If mine stops on the start of a compression stroke I always get a slight grunt almost like a bad battery and I know it's good since I keep a close eye on it checking and a maintenance charger it my rids get more then a week apart. However if it on the down stroke and it cranks freely and it does not catch on the first firing cylinder I think this fuel injection dumps into the header pipe and the next firing cylinder ignites it with the pop. Basically its just the perfect air to fuel ratio to explode. I do not think anything is wrong personally.
#22
Thanks, but the comment I made on the butterfly is not correct for the throttle bodies now, I removed it from the post above were you grabbed it. Was in the past and some cars I have worked on. However Harleys' throttle body has a area open when at the factor set stop that allows a calibrate amount of air to flow beside what the IAC does. Probably to ease tolerance in production and prevent butterfly sticking even at high mileage.
#23
#24
2006 Model Big Twins had a Service Bulletin M-1185.
This related to a driveability problem for what is generally known as a "cough". This may be what you are experiencing and describing as a backfire, which it is close to.
Anyway back then the fix, on Harley's dime was to replace your 8 degree injectors with 25 degree injectors and it fixed the problem. Look into the bulletin and see how to identify the injectors that you currently have. If you have the older ones then replace them.
This related to a driveability problem for what is generally known as a "cough". This may be what you are experiencing and describing as a backfire, which it is close to.
Anyway back then the fix, on Harley's dime was to replace your 8 degree injectors with 25 degree injectors and it fixed the problem. Look into the bulletin and see how to identify the injectors that you currently have. If you have the older ones then replace them.
#25
UPDATE--I cleaned the carb; added SeaFoam -- same thing happens this evening.
on the highway doing 75 - 80 for 10/15 minutes off the highway idle 400 -- 900 rpms wants to cut off -- I give gas to keep it going -- had I not given it gas it would have cut off. this is becoming a more frequent occurence.
Any other suggestions?
thanks is advance
on the highway doing 75 - 80 for 10/15 minutes off the highway idle 400 -- 900 rpms wants to cut off -- I give gas to keep it going -- had I not given it gas it would have cut off. this is becoming a more frequent occurence.
Any other suggestions?
thanks is advance
#26
ripsaw, your're dead-on about the sense of having a low battery every now and then. I felt the same thing, even though I always keep by bike on a trickle charger. I thought it was me, but you are right. I will keep my ear open to see if it also does it at the same time it backfires. And yes, it is a loud back fire, not merely a cough. I could tolerate a backfire on a 61 Volkswagen, but I don't think any reasonable running motor, especially one made this century, should be doing this. Over time, I think it can lead to problems.
#27
ripsaw, your're dead-on about the sense of having a low battery every now and then. I felt the same thing, even though I always keep by bike on a trickle charger. I thought it was me, but you are right. I will keep my ear open to see if it also does it at the same time it backfires. And yes, it is a loud back fire, not merely a cough. I could tolerate a backfire on a 61 Volkswagen, but I don't think any reasonable running motor, especially one made this century, should be doing this. Over time, I think it can lead to problems.
REMEMBER CGMARTIN IS TALKING ABOUT A LOW BACKFIRE POP AT THE START OF THE CRANKING OF THE MOTOR AND BEFORE IT STARTS. NINE TIMES IT WILL CRANK FOR SAY COUPLE THREE OR FOUR CRANKS AND START WITH IN THERE WILL BE ONE WITH A CRANK ONE CRANK OR SO AND POP LOUD AND CRANK TWO OR SO MORE AND START JUST LIKE THE OTHER 8
Last edited by Jackie Paper; 02-01-2013 at 08:13 PM.
#29
Ok. I've taken a look at my bike, and it still has the 8 degree injectors. it is a 2006 Heritage classic. other than the occassional back firing at start up, it runs fine. Would there be a major improvement in going to the 25 degree? Can it be done without the re-mapping? Any idea on cost?
#30
Ask this specific backfire problem with hopeful better title in another thread.
https://www.hdforums.com/forum/gener...y-do-that.html
also some 8 ver 25 threads
https://www.hdforums.com/forum/touri...-question.html
https://www.hdforums.com/forum/elect...injectors.html
https://www.hdforums.com/forum/dyna-...injectors.html
https://www.hdforums.com/forum/dyna-...-my-06-wg.html
how to identify
http://www.mastertune.net/downloads/...isting-v37.pdf
https://www.hdforums.com/forum/gener...y-do-that.html
also some 8 ver 25 threads
https://www.hdforums.com/forum/touri...-question.html
https://www.hdforums.com/forum/elect...injectors.html
https://www.hdforums.com/forum/dyna-...injectors.html
https://www.hdforums.com/forum/dyna-...-my-06-wg.html
how to identify
http://www.mastertune.net/downloads/...isting-v37.pdf
Last edited by Jackie Paper; 02-05-2013 at 12:44 PM.
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