As you do this take note if you feel some looseness at the connection (it may have been caused by engine vibration). Twist the boot if necessary to break the heat seal to the plug, then pull. They're not expensive, and having them could prove useful if you ever have to disconnect wires for other underhood service. There are special pliers of all sorts designed to reach in and grasp the boot. If it's in a recess or is difficult to access for some other reason, use a spark plug wire tool. Of course, if you're replacing a bad wire, it may not matter, but if any one of the old wires is still good, it's best to keep it as a spare.Grasp the plug wire by the boot at the plug end. The actual method of removing the old wire is not always "just pull it off." Pulling on the wire itself is sure to cause an internal separation. Some high-performance wires are not the resistance type, and although they may do well on racing cars, they can affect the operation of underhood electronics by not containing radio waves. For a late-model V8, be prepared to pay the dealer up to $200 or more, even for a popular car.Ī word of caution: You may not want "high-performance" wires, even if they fit your car (and they may be cheaper than a conventional type). Prices for 1980s models may be under $35 for a popular make at the parts store. Once you've found a bad wire, the solution should be simple: Replace the plug wires.įirst, you have to decide whether you want to buy from a car dealer at list price or get a quality aftermarket brand, if you have that choice. Inexpensive boot pliers allow you to remove stuck plug wires without damage. An absolutely failed wire will have a hairline break somewhere, and the resistance will be infinity. However, if they look bad but there are no arcs, do a resistance check.Ī conventional plug wire has a resistance of 10,000 to 15,000 ohms per foot of length-if it's measurably higher, the wire probably is bad. If they are damaged by abrasion, oil-soaked, cut, burned from contact with the exhaust, or have a dried-out look with heat cracks, it definitely shouldn't be a surprise if you see arcs in the dark under some conditions. Now look at the wires under good lighting. This will often produce an arc from the wire to the screwdriver. Then, run the tip of the screwdriver along the length of each wire and all around at the coil and plug boots. Of course, running the engine at idle doesn't exercise the ignition system very hard, so you can add something to the test by spraying the plug wire ends with clean water from a household spray bottle.Īnother test: With a jumper wire, ground the metal shank of a screwdriver that has a well-insulated handle. If you see little electrical arcs, or hear a snap-crack, there is high-voltage electrical leakage. Run the engine in near darkness, and then look and listen. The jackets may be damaged from the outside by abrasion caused by engine vibration (particularly at the plug-end boots), a hot engine compartment, spilled fluids or battery acid, multiple disconnections and reconnections for other service, or even a family of nesting rodents. Engine misfire often is caused by leaking spark plug wires, so visual inspection could reveal what's wrong. However, not everything calls for high-tech diagnostics and the latest scan tester. You've touched every sensor connection to see if it's on tight, you've even checked for trouble codes. Find out more about our advertising opportunities.A brief underhood inspection confirms that all the vacuum hoses are on and that none of them have been burned open by leaning against the exhaust manifold. Advertise Advertising on is well-targeted, has unique benefits, and is highly successful. Looking for something lighter? Read our funny complaints to see people who found humor in a bad situation. Vehicle Problems Find out what cars to avoid, view the latest problem trends, or keep up-to-date with the most recently reported problems. Contact us with any comments or concerns.
#How to install spark plugs 2000 chrysler 300m drivers
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