- Difficulty starting the engine.
- Vibrations of the engine at idle and its stops.
- Jerks with increasing engine speed.
Leak test
1. Start the engine and cover the muffler with a rag.
2. Listen to the exhaust system. If necessary, spray the cylinder head/exhaust manifold and exhaust manifold/downpipe connections with a leak tester and inspect for bubbles.
3. Repair the leak.