![]() Eliminate engine mechanical trouble before performing ignition service or fuel injector work.Ī compression check was once a part of every engine tune-up. ![]() Before “tuning” an engine, make certain that compression, manifold vacuum, valve timing (chain/sprocket wear on a 4.0L engine) and oil pressure are okay. Compression was normal and within the 10% high-to-low spread for reasonable cylinder balance.Įngine tuning always begins with evaluating the engine’s mechanical condition. ![]() Carbon, however, is present at the plug shell, a sign of carbon buildup in the combustion area and likely around the valves. Parts wear is deceptive, as the strong spark and controlled fuel management keep spark plug tips clean. No signs of oil burning, minor buildup of debris and little gap wear are typical for these EFI engines when in good operating condition. ![]() Spark plugs were still firing at close to 60,000 miles since the last major tune-up and 30,000 miles since the last spark plug and air filter change. ![]()
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