Question about 2003 Harley Davidson FLHRCI Road King Classic

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My road king started to run a little rough at low rpm. changed plugs ran a bit better then started rough again?

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I would suspect a coil issue. A KV test can be performed to see if its weak.

Posted on Jul 16, 2010

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Harley troubleshooting


Engine Runs but Misfires
1. Fouled or improperly gapped spark plugs.
2. Damaged spark plug cables.
3. Incorrect ignition timing.
4. Defective ignition components.
5. An obstructed fuel line or fuel shutoff valve
(carbureted models).
6. Obstructed fuel filter.
7. Clogged carburetor jets.
8. Malfunctioning fuel pump (fuel injected models).
9. Loose battery connection.
10. Wiring or connector damage.
11. Water or other contaminates in the fuel.
12. Weak or damaged valve springs.
13. Incorrect camshaft/valve timing.
14. A damaged valve(s).

Jul 11, 2014 | 2002 Harley Davidson FLHRCI Road King...

1 Answer

Car was running a little sluggish, changed plugs and car ran great for 45 minutes then started running rough. checked ignition module, coil packs. all ok. replaced wires, ran better then started running...


Make sure the HT leads are secure. They might be popping off, causing it to not fire on one cylinder. I always change the plugs and leads at the same time to keep them the same age. HT leads break down rapidly and need regular replacement.

Jun 23, 2010 | 1990 Oldsmobile Cutlass Ciera

1 Answer

Rough Idle and missing at low rpms on 2003 Ford Ka


make sure you put the right plugs in the fault is most likely the coil pack follow the plug leads from the spark plugs and you will reach the coil pack about £60

Oct 28, 2009 | 2003 Ford Escort

1 Answer

Runs bad


I had to replace ever frigging vacuum hose on mine, and that seemed to help...

Apr 04, 2009 | 1985 Nissan King Cab

1 Answer

Engine hesitation in gear.


put some plug wires on the car.

Feb 24, 2009 | 2002 Dodge Caravan

1 Answer

93 cavalier vibrating


your probably feeling a rough idle of the engine. need a tune up?

in park the engine is not loaded down, just idling at a low rpm=rough
in drive with brake on you have put some load on motor also at low rpm=rough
in drive on the road engine is at higher rpm, = smoother

generally 4 cylinder motors idle a bit rough, especially if one spark plug is not firing right or fouled or one bad spark plug wire. tune up may fix it. if it is not stumbling real bad or stalling then you can live with it.

Nov 22, 2008 | 1999 Chevrolet Cavalier

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