![]() ![]() Speaking of check engine lights, in TSB #PIP3423M Buick recommends technicians inspect for loose timing chain or tensioners when trouble codes P0016, P0017, P0018, P0019, P0008 or P0009 pop up. In the worst case scenario, pistons smash into the valves, bending them resulting in catastrophic engine failure.Mechanics might tell you the timing chain "jumped a tooth” as it was improperly tensioned.You might find metal shavings in the oil as small bits of the timing chain fall off or shavings accumulate as your camshaft gets scored by the chain.The engine will start to misfire as combustion timing is thrown off.You’ll start to notice a rattle, especially at idle as the loose timing chain vibrates around the engine.A check engine light should come on once sensors in the engine realize the timing is thrown off.Symptoms of a stretched timing chain include: Timing chain slack can be due to a defective chain tensioner, or the result of a worn out and stretched chain. But eventually pistons start misfiring, valve timing is thrown off, a trumpet player goes off key, and before you know it your engine is destroyed. It sorta works at first … you know, in an artsy way. When the timing chain has slack it can throw the pistons and valves into more of an interpretive jazz dance. The timing chain is the conductor, controlling the timing of all those moving parts. In order to achieve those stages over and over again, pistons and cylinders have to move in unison with the precision of a classical ballet. Intake, compression, combustion, and exhaust are the four stages of the internal combustion engine. What Happens When There’s Slack in the Timing Chain? ∞ Owners of vehicles with these engines, like the Buick Enclave, have experienced issue due a stretched timing chain as early as 40,000 miles. Įven with proper maintenance, the timing chains in many of GM’s 2007-2010 2.8L and 3.6L V6 engines are susceptible to stretching. But if you regularly maintain your oil, a lubricated timing chain shouldn’t give you much trouble for 120,000+ miles and can last for upwards of 300,000+ miles. Like any component in your car a timing chain will eventually need maintenance of replacement. Timing chains have made a recent resurgence over timing belts because the chains have a longer life expectancy. There is also usually a chain tensioner that has the critical job of keeping the chain tightened within a specific specification.Ī properly tightened timing chain is critical to keeping your engine’s well, … timing in check. Located in the front of the motor, the chain is run through a series of guides, gears, and pulleys. A timing chain is the critical connection between your engine’s camshaft and crankshaft. ![]()
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