[SIZE=2] Spark plug wires (also called "ignition cables") carry high voltage current from the ignition coil(s) to the spark plugs. On older engines with distributors, the wires run from the distributor cap to the plugs, and come in different lengths to reach the closest and furthest spark plugs. The wire set also includes an extra wire that connects the center terminal on the distributor cap to the ignition coil (unless the application is a GM HEI distributor where the coil mounted inside the top of the cap).[/SIZE][SIZE=2] On engines with distributorless ignition systems (DIS), plug wires are also used to connect the coils to their respective spark plugs. On some engines, there is one coil per spark plug, while on others with "waste spark" ignitions, two plugs share each coil.[/SIZE] [SIZE=2] On coil-on-plug (COP) ignition systems, there are no plug wires because the coils are mounted directly on top of the spark plugs. But in coil-near-plug (CNP) systems, there are short wires that connect the coils and plugs. On some applications, these wires are part of each coil assembly and cannot be replaced separately.[/SIZE]
[SIZE=2]SPARK PLUG WIRE PROBLEMS[/SIZE] [SIZE=2]Regardless of the type of ignition system or the type of spark plug wires used, good plug wires are absolutely essential for reliable ignition performance and trouble-free operation. A bad spark plug plug wire may create so much resistance that the voltage never reaches the plug, or a break in the insulation may allow the spark to arc to ground. Either way, a bad plug wire will cause a spark plug to misfire.[/SIZE] [SIZE=2] Bad spark plug plug wires can cause hard starting (particularly during wet weather), poor fuel economy, rough idle, hesitation when accelerating and increased hydrocarbon (HC) emissions. On 1995 and newer vehicles with OBD II Onboard Diagnostics, misfiring due to bad plug wires may also set a fault code and turn on the Check Engine light.[/SIZE] [SIZE=2] Spark plug wires should always be inspected if any of these symptoms are present, and when the spark plugs are changed. If wires show any obvious damage such as burned or cracked insulation, chaffing, loose plug boots or terminals, the wires should be replaced. Also, if visible arcing is present new wires are needed. Wires should also be replaced if their resistance measured end to end with an ohmmeter exceeds OEM specifications.[/SIZE] [SIZE=2] As a rule, if more than one spark plug wire has excessive resistance, the entire set should be replaced.[/SIZE] [SIZE=2]
SPARK PLUG WIRE REPLACEMENT TIPS[/SIZE] [SIZE=2]Spark plug wires come in different lengths, so match up the lengths with the original wires so the wires fit properly and do not droop or rub.[/SIZE] [SIZE=2] Replace ONE WIRE at a time to avoid mixing up the firing order (very important!). Start with the longest plug wire(s) and go to the shortest or vice versa. If you mix up the firing order, the engine may not start or it may pop and backfire. This may damage the engine so always double-check the firing order if you are unsure. Refer to the firing order in a service manual or markings on the intake manifold, plug wires or distributor cap (if used). Note: Different vehicle manufacturers number they cylinders differently so make sure you know which plug is number one and how the cylinder banks are numbered.[/SIZE] [SIZE=2] The replacement wires should be routed exactly the same as the originals, and supported by looms or clips so they do not contact the exhaust manifold(s).[/SIZE] [SIZE=2] Additional items you might need when replacing spark plug wires include spark plugs, a spark plug boot puller (makes removal and installation easier), replacement looms or wire supports for original parts that might be missing, and dielectric grease for tight-fitting boots (makes removal easier next time, and helps keep out water).[/SIZE]
ang unang mararamdaman mo dito ay parang patay ang isang spark plug mo kaya chumochope ang rev ng engine mo. ang pag-test dito ng mechanic, habang naka-idle ang engine ay isa-isa nyang hahatakin ito at itatapat sa ulo ng plugs para makita niya ang lakas ng pitik ng kuryente. kapag sobra na ang nipis/napaka-hina na ng pitik ng kuryente, advise ka na niya bumili ng bagong HTW.
pull out each high tension wire from the sparkplug, see if the engine's rpm changes. if it doesn't then you have found either a bad plug or a faulty high tension wire.
+ 1 ako dito.
iba lang sa cars with no rpm indicator/gauge. pero kung pakikinggan mong maigi ang tunog ng makina mahalata mong nagbabago once ma-pulledout mo yung htw. so kung halos walang nangyari sa ugong ng makina pag tanggal mo ng htw IYUN NA YUN sira either spark plug or plug wire. once identified mo kung alin ang may deprensya pwede mong test kung plug wire lang -itapat sa engine metal body(not to the spark plug) at obserbahan kung malakas ang pitik, dinig mo yung lagitik at makikita ang kislap. now kung wala nun, eh wire na sira nyan. then pag malakas ang lagitik ok pa htw then tapat mo sa spark plug pag walang lagitik sira yung spark plug na yan.