I have powercommander3 on my sportster it has 3 buttons low mid-high to increase or decrease fuel in rpm I adjusted these setting now I have backfire through the throttle body its fuel injected and it has sluggish idle and when I drive the bike jerks I don't know if it's to less of gas too much can
Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
9. Improper valve clearance (too tight).
10. Check for generated diagnostic codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below and for more specific information or questions at no charge please feel free to contact me at [email protected]. Good luck and have a wonderful day.
https://www.hdforums.com/forum/sportster-models/29968-how-do-i-get-it-to-stop-backfiring-thru-the-carb.html
https://www.mediafire.com/file/62dn289vwu580yn/2006_Harley_Sportster_Service_Manual.pdf/file
http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
https://ownersmanuals2.com/harley-davidson/sportster-1200-low-2006-owners-manual-66462
https://www.6ya.com/ to speak to me personally
SOURCE: GAS MILLAGE
wrong size jest eg main jet shoukld be .1xx, but the shop fitted the largest optional one, as that is what they had. A change from a .112 to a .108 makes a huge change. Don't know if the CB650 carbs had a needle that could have its position changed? Soft tires, dragging brake, even VERY slightly, bad wheel bearings, clogged air filter (wash and oil, or a new one)
SOURCE: High Idle on a 2007 Night train
The engine needs 950-1050 rpm's to properly charge the battery and supply enough oil pressure. Lowering it can effect both and is not advisable to do. There;s a small window to play with but it is better left at factory specs. As far as FI injection to carb, it can be done but at a cost and the same applies to idle speed there, just a bit more of a window because of no fuel pump drawing from the system.
SOURCE: 04 sportster 883 will turn over and back fire but will not start
Sounds like it jumped time.. Check your timing ..
SOURCE: when riding 2005 fuel injected harley road king,
Sounds like the intake manifold is leaking. The area where the leak usually happens, are those two rubber sleeves that go from the heads, (Cylinder heads) to the intake. Sometimes the clamp/s loosen up. Sometimes these rubber sleeves deteriorate, and cracks form.
This makes the engine backfire, pop, and idle fast.
The added air at the wrong time cause a backfire, when you let off the throttle. The added air causes the engine to pop, because the exhaust valve has sucked up some cold air.
The engine idles fast, because more air is being introduced, and not metered by the injection system.
(The exhaust valve thing. Exhaust valves are supposed to open, and let exhaust out right? Well there is a thing called Valve Overlap.
The Exhaust valve hasn't closed all the way yet, and the Intake valve is opening.
The 4 stroke engine, (Of which a Harley is), has these four strokes.
1.Intake Stroke. Fuel/air is sucked in.
2.Compression Stroke. The piston comes up and squeezes the fuel/air mixture.
3.Combustion Stroke. The spark plug lights the fuel/air mixture off.
4.Exhaust Stroke. The spent gases are expelled out.
Your Road King has one camshaft. There are four cam lobes on it.
Intake, Exhaust, Intake, Exhaust.
If you had the camshaft in your hand, and had the gear end facing you, look down the camshaft. You will see those egg shaped cam lobes. You will notice that No.1 cylinder Intake lobe is facing to the left.
No.1 Exhaust is facing to the right.
If you put a degree wheel on the gear end of the camshaft, and had the No.1 Exhaust lobe ramp nose facing straight up, you would see that it's about 110 degrees, before the Intake lobe ramp at .050 lift, comes into play. (The roller, of your roller lifter has raised the Exhaust valve up .050 inch) There is about 55 degrees before the Exhaust valve hasn't quite shut.
This is okay for normal running. Introduce a vacuum leak, and the surge of extra cold air, makes it pop.
Solution? I suggest checking to see if the clamps on those rubber sleeves are loose. You can also spray WD-40 towards the ends of each rubber sleeve, when the engine is idling, and see if it speeds up. Means, one or more, of those rubber sleeves has deteriorated.
SOURCE: Bike backfires and I can't get a smooth ride
I would say it is a faulty engine temp or Air temp sensor,
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