Question about 2008 Harley Davidson FLHTC Electra Glide Classic

1 Answer

Intermittant spark on 2008 harley davidsonelectraglide

Wont start was running seemed to have a miss last 10 miles would idle went to restart following morning wont start spark sometime maybe one plug then no spark then some maybe jumps to the front cylinder

Posted by Anonymous on

1 Answer

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  • Harley Davidson Master
  • 3,506 Answers

What DTCs are set???

Posted on Oct 18, 2014

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

rselvy
  • 83 Answers

SOURCE: Rear cylinder not firing

The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Posted on Dec 08, 2008

  • 9 Answers

SOURCE: Harley Davidson will not start

you say at times its fireing. sounds like ignition problems. does it have points? if so they may me worn out. I have an 87 sportster evo that has points in it.

Posted on Jan 21, 2009

  • 2 Answers

SOURCE: HD 1200 Sportster 1997 model misfiring on rear cylinder

hi paul here,
the coil on my bike turned out to be the problem after checking wires, connections and plugs. brought a used single fire. tried it out after being told that coils usaully go all bad not just half. have not had the problem since and i was conteplating buying ignition and coil combo for hundreds. good luck

Posted on Mar 26, 2009

v2iper
  • 150 Answers

SOURCE: what size spark plug for a 2000 harley davidson road king carbed,

Your Twin Cam plug should be a 6R 12 Harley Plug. Often times the back fire is just the nature of the beast depending on what type of pipes you are running. Harleys do run lean, its an EPA thing thtas why they choke them down from the factory. Since you have a carb you could have an intake leak around the Intake. Also Under the carb is an adjustment screw. Harley plugs it up so people don't play with it. You have to just drill out the plug this will set your air fuel. Whenever I take a carb off I drill out that plug. Heat your bike up operating temp and ear tune that screw. Only other way is with air fuel analizer or a dyno. good luck.also that backfire is caused by fuel hitting your exhaust when you let off just to let you know.

Posted on Jun 15, 2009

v2iper
  • 150 Answers

SOURCE: harley engine wont idle

Your bike has an idle screw on the carb. looking at carb its on the right side turn to the right to bring up your idle.

Posted on Jun 27, 2009

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Hi Anonymous, and the usual suspects are:
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2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
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12. Loose or dirty ignition module connector at crankcase.
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Hi Anonymous, and the usual suspects are:
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2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
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Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
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Fuel injected 95 inch 03 road king lean misses a couple minutes after starting and then at low idle when hot


Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals especially the negative cable at "BOTH" ends, ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor or intake seals.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust valve.
For a prime suspect please visit website below.
Good luck and have nice day.
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My 2007 harley heritage softail stated missing, backfiring, and wont stay running. it has 25000 miles and the sparkplugs look to be in good shape.


Hi Edwardparisi, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
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It sounds like the engine is running a bit lean but it could be spark plugs or wires breaking down under a load. Try another set of spark plugs but don't throw the old ones away. If this does not correct the problem, you're going to have to take the bike to a dealer or someone that can "remap" the fuel system. The mechanic may want to see the old spark plugs to determine if the mixture is lean. Due to EPA emission standards requirements, Harley's come set up to run very lean and sometimes they are just too lean for some areas of the country. Good Luck.

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1 Answer

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Here is a list of things you can start with:

1. Spark plugs in poor condition or partially fouled.
2. Spark plug cables in poor condition and shorting or leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, ECM, or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connection at battery terminals,
ignition coil or ECM connector.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system.
9. Fuel tank vent system plugged.
10. Air leak at intake manifold or air cleaner.
11. Loose or dirty ECM connector.
12. Faulty Sensor(s): Manifold Absolute Pressure (MAP),
Crank Position (CKP) or Oxygen (O2).
13. Incorrect valve timing.
14. Weak or broken valve springs.
15. Damaged intake or exhaust valve.
16. Partially plugged fuel injector(s).

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3 Answers

New spark plugs last 10-15 minutes of riding


Hi and welcome to FixYa,

Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).

Good luck and Thank you for using FixYa. Happy Holidays.

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