Question about 2004 Harley Davidson FLHTC - FLHTCI Electra Glide classic

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Crossed thread on sparkplug

Tried to install new plugs that didn't want to go in I took it out and couldn't get old one in either.

Posted by Anonymous on


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Hi Anonymous, this one should be left to a professional, your local dealer or reputable shop. Good luck

Posted on Apr 29, 2015


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1 Answer

How to remove sparkplug. And replace back new ones

Use the correct size spark plug socket, ratchet wrench, extensions and possible a universal or swivel adapter. Remove the plug wire, remove plug with socket/wrench, insert and snug down new socket and firmly seat plug wire. Do one at a time so as not to cross wires uo. Be careful inserting new plug so as not to cross the threads uo and make sure the gap of the plug is correct for you engine.

Oct 17, 2016 | Toyota Cars & Trucks

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What causes air to seep around the spark plugs on a 2002 Chrysler voyager

Loose sparkplug
cross threaded sparkplug
over compressed washer on sparkplug
worn threads in the head

Just put new ones in. Start them by hand and turn using a sparkplug socket and extension bar until tight. Add the ratchet bar or T-Bar and tighten a further one eighth turn.

Jan 10, 2016 | Chrysler Cars & Trucks

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Are the heatsheild on sparkplug wires attached to sparkplug wireboot or attached to head some how I dont want to mess up wires

They usually aren't attached per se, they fit in a socket that is snug enough to hold them. But the spark plug wires trap them into position. So you can go ahead and pull the spark plug wire off.

One thing to remember, when you go to replace the spark plugs you won't be able to see if they are cross thread in their hole, so DO NOT use a socket until you are sure the are properly seated and not cross threaded.

Jun 28, 2011 | 1999 Dodge Dakota

1 Answer


Just had the same problem..............

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Jun 09, 2011 | Tomtom GO 710 Car GPS Receiver

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How to change spark plugs

Those are as easy as they come these days. Mark each spark plug wire with a piece of tape with the cylinder # written on it, so as not to mix up the wires. Remove each spark plug wire by firmly grasping the wire by the boot (do not pull on the wire) and twist it back and forth a few times while pulling slowly. It should pop off without a great deal of effort. If it is seized and it breaks, you will have to replace the wire, or at the very least replace the terminals (if you can get some). Use an air hose and blow around the base of each spark plug to dislodge any loose dirt that could fall into the cylinders (not absolutely necessary, but a good idea). Remove each spark plug with a spark plug socket and extension and ratchet (I forget which size socket, it's either 5/8 or 13/16). Check the gaps of each new spark plug (typically around 0.035 in). re-install each new spark plug by hand (do not cross-thread them) and once you have ensured that the plug is threaded in properly, tighten the plug until it seats, and then tighten an additional 1/16 of a turn. Repeat this for the remaining plugs. Re-install wires to the corresponding spark plugs. You're done!

Jan 10, 2011 | 1983 Ford Crown Victoria

1 Answer

We water logged the engine took out the sparkplugs and let the water drain out but now our only problem is where having alot of trouble getting the sparkplugs back on, it feels like were stripping the...

As a preamble when you have expelled all the water from the cylinders and you again add fresh oil. For this first bit you will only need a minimum of oil 2 litres (4 pints). Turn the engine on the starter again for a minute or two with the plugs out. This will allow the oil to help flush any water from the passageways. Remove and discard this flushing oil and now fill the engine wit he required amount of new oil. Put a tiny amount of grease (Copper based anti seize will do well) on the first few threads of each plug. Put a piece of cloth down each plug socket and turn the cloth counter clockwise, this will ensure the cloth is not drawn into the cylinder whilst it cleans out the threads. Hold the top of the plug in a length of rubber hose and then post the plug down into its socket. Turn the hose, again counter clockwise, and feel for the thread stepping; this process will help prevent cross threading. Just after a 'step' start to turn the rubber hose clockwise to engage the thread and then continue to twist it in. Holding the plug in length of rubber hose ensures that if the plug begins to become cross threaded no damage will occur as the plug either rotates in the hose or the hose twists on itself. Plugs are fitted in tight tolerance threads to prevent gas blow by or plug ejection when running; as a consequence they do not slide in as easily as a standard bolt and always a bit on the tight side. Once you are happy that a plug is engaged pull off the hose and inspect the top of the plug just to make a final check that the plug lies central to its socket (if cross threaded it will be off centre). Tighten down to the specific torque settings. Re attach the high tension plugs in the right order.

Oct 06, 2010 | 2006 Ford Ranger

1 Answer

I fitted a new sensor and my bike does not start at all after fitting. Before I fitted the new sensor, I took it to Truimph and they had it on the dianostics and they told me to fit a new sensor.It also...

Thanks for your feedback. When you say "It also smells madly fuel when I start the bike." does the bike start?
I'm going to assume not.
I don't know much about Fuel Injection but there is three things motors need to run - compression, fuel and spark. It sounds like you have compression and fuel, so we need to check for spark.
Chances are the plugs are simply fouled with gas. You can simply buy new plugs (esp if they're old) or check the existing ones for spark.
CHECK FOR SPARK The best way is to remove all of the sparkplugs, re-connect them to their wires, rest the threads against a good ground. Turn the motor over and look for a good fat white spark.
If no spark, make sure all 'safety' switches are in a start position (side stand up, neutral, kill switch on etc.)
Good lcuk & let us know!
Be sure to put a dab of neversieze on the sparkplug threads when re-installing.

Dec 11, 2009 | Triumph Daytona 955i Motorcycles

4 Answers

Bike: 1999 Xr 250r cross threaded spark plug poor compression

either buy a new head for it... or better yet this is a product that i've heard of that may fix your problem with limited effort

Apr 03, 2009 | 1999 Honda XR 250 R

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