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30% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

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30% Off All Online Orders of Select Hard Parts
Receive 30% Off Your Online Parts Purchase. Use promotional code MMJ30 at checkout to receive discount. Not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included will be displayed in product search results and product detail pages. INCLUDES the following categories: Batteries, Brake Rotors, Ignition, Starters, Alternators, Radiators, Fuel Pumps, Shocks and Struts and EXCLUDES the following brands: Powerstop, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Thule, Thule Karrite, , Flowmaster, Hurst, B&M, MSD, Moog, Wagner and BBK Performance. Valid online until 2:59 am EST on 3/27/17.

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Haynes Tech Tips - Spark Plugs

 

Are your spark plugs trying to tell you something?

They can tell you a lot about the condition of your engine. If one or more of your spark plugs have sooty black deposits, that cylinder is probably using too much fuel or misfiring. Oily black deposits are often a sign that oil is getting into the cylinder, usually either past the piston rings or the valve guides.

There’s more spark-plug detective work you can do using the color spark plug chart that’s included in each Haynes model-specific repair manual.