Wednesday, March 5, 2014
How to Troubleshoot the Exhaust System in a VW Jetta
When problems plague your Jetta exhaust system, handle them by pinpointing the culprit. Examine devices from the engine to the tailpipe because exhaust system challenges could originate from various areas. Troubleshoot the exhaust system in a VW Jetta by dealing with system warning signs. Join a mechanic and apply these steps to most model years.
Instructions
- 1
Inspect your exhaust manifold and cylinder head for leakage. Thermal expansion and contraction could cause leaks to occur at the place where these devices join. Shear stress pressures the exhaust manifold gasket when you start up, drive or shut down your Jetta. This can cause leaks.
2Pay attention to popping or hissing noises when the engine is going. Check the exhaust ports on the cylinder head for signs of paint discoloration or burns. See if your spark plug wires and boots have burns.
3Examine the area connecting the exhaust manifold and head pipe. The back-and-forth motion of your engine caused by drive torque leads to movement at the joint where the head pipe joins the exhaust manifold. Look for discoloration caused by hot gases that escaped this area. This pertains to the 4-cylinder and 6-cylinder engines.
4Check the exhaust pipes for signs of damage. Use large pliers to exert pressure on pipes. Replace pipes that break or give way to your pressure. Make sure to keep the engine running while testing the system. It proves easier to detect leaks and other problems with the engine going.
5Listen for strange sounds coming from areas near your muffler. For instance, a buzzing noise that increases with acceleration could reveal exhaust system problems. A whistle sound or high-pitched hissing noise in the tailpipe could come from system restrictions. Get a mechanic to read your engine intake manifold vacuum. Low readings mean your system is blocked.
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