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How do I tell if I have a bad fuel injector on a 2008 Harley Davidson sportster 1200 xl c.

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  • Harley Davidson Master
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If its runnin too lean or tu rich. Or if the cylinders not firing but has spark. A data stream run w factory scanner. A bad computer can mimic bad injector.Bad igntion can b mistaken for worn injector. Both considerd misfires

Posted on May 03, 2015

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  • Harley Davidson Master
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Hi Drew, both Guy and Bill gave excellent answers, the only thing I could add is if you have the fuel tank off drain the gas and shine a flashlight inside and inspect for water, dirt, rust, and my personal favorite, evil ethanol sludge. Please visit the websites below for additional clues:
Harley Diagnostic Trouble Codes
Running rough idle and popping Page 2 The Sportster and Buell Motorcycle...
Good luck

Posted on May 03, 2015

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You can remove the injectors and roll the bike over watch for spray our of both injectors you can try putting injector cleaner in the fuel to see if it will help clear it out also check that they both are getting power it will be a lower voltage than 12 volts i believe it will be 4.8 v or so use a volt meter to see if they both are getting a pulse of voltage by rolling bike over with meter hooked up

Posted on May 03, 2015

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  • Harley Davidson Master
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Poor performance , flooding, low fuel pressure, misfiring and hard starting
all would indicate an injector problem but all are not necessary an injector fault
have the fault codes read as the problem may be electronic

Posted on May 03, 2015

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Posted on Jan 02, 2017

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SOURCE: spark plug

The proper air gap is .032 to .036 depending on spark plug brand.

Posted on Nov 10, 2008

  • 2712 Answers

SOURCE: spark plug

The proper air gap is .032 to .036 depending on spark plug brand.

Posted on Nov 20, 2008

  • 218 Answers

SOURCE: 2003 Harley Davidson Sportster 1200 Custom Tachometer kit

The only idea that i can come up with is that you dont have a good ground..or the guage was bad when you bought it..i hope this..Keith

Posted on Jul 02, 2009

wayneman01
  • 301 Answers

SOURCE: 2003 Harley Davidson XL 1200 C Sportster

That's a strange one. The only things I can think of suggesting are:

  • Clogged gas cap vent. The next time is starts running poorly, remove the gas cap briefly and see if things improve. If so, then the cap is not venting as it should.
  • Moisture trapped in float bowl. Drain the contents on the carburetor float bowl into a clean container and check for dirt, rust, water, or anything else that doesn't belong there.
  • Dirty fuel filter. If there is one, replace it.
  • Air leak between carb and engine. Check tightness of clamps and manifolds for cracking. WD-40 sprayed around those areas with the engine idling will help detect any leaks.
That's all I can think of. Please let me know if any of my suggestions fixed it.

Posted on Dec 09, 2009

wd4ity
  • 4565 Answers

SOURCE: 2003 Harley Davidson XL 1200 C Sportster Custom

I would guess stale gasoline or fuel. Try fresh fuel in the tank. If this doesn't clear the problem, you could need to have your carburetor or fuel injection system cleaned. I'm not even sure if they put fuel injection on Sportsters since I don't work on fuel injected bikes. I mostly work on the older bikes like Panheads, Shovelheads, Evos. Not too many Sportsters but have worked on a lot of Ironhead Sportsters. Try the fuel first. It's a cheap fix. Hope it works for you. Good luck with the knee replacement. My wife had one knee replaced and it works great.

Posted on Dec 15, 2009

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8. Fuel tank vent system plugged or gas cap not venting.
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10. Fuel valve vacuum line broken or carburator vent line closed off.
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The only idea that i can come up with is that you dont have a good ground..or the guage was bad when you bought it..i hope this..Keith

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