Troubles w PCV & Water Pump – 2017 Audi Q7

2017 Audi Q7 white car parked outside of the shop | Euro Auto Tech & Smog

Project Name: Troubles w/ PCV & Water Pump 2017 Audi Q7


Project Type: Residential


Location: La Mesa, CA


Duration: 3 Days


Project Cost: $4,000


Primary Service(s) Provided:

  • PCV (Crankcase Vent Valve) replacement
  • Replacement of fuel injector o rings, temperature sensor, breather hose, and intake gaskets
  • Thermostat housing and water pump replacement to resolve coolant leak
  • Supercharger manifold coolant pipe gasket replacement
  • Full coolant system flush and refill
  • Oil change and spark plug replacement


Project Details

This 2017 Audi Q7 arrived with a loud whistling coming from the crankcase vent valve (PCV) and a noticeable coolant leak. Our team quickly diagnosed the PCV as the source of the whistle, while a cooling system pressure test pinpointed the thermostat housing and water pump as the culprits for the leak. We also discovered coolant leaking from the supercharger manifold pipe. To address both the original and related issues, we replaced the PCV and associated components including fuel injector o rings, breather hoses, and intake gaskets along with the thermostat housing, water pump, and manifold gaskets. The coolant system was fully flushed and refilled, and we performed a fresh oil change and spark plug replacement for added reliability.

August 28, 2026
Let’s talk shop. This 2014 Audi SQ5 came through the shop with what looked like a fairly routine oil leak. But once we got it on the lift and started digging deeper, we found a little surprise hiding behind the symptoms. Let’s dive in. Diagnosis On the 3.0 supercharged V6, timing chain system issues can become a serious concern as mileage adds up. Chain stretch, worn guides, tensioner problems, and related components can lead to timing faults, rattling noises, especially on cold starts, and, if ignored, potentially major engine damage. Another major issue is that the timing chain is located at the rear of the engine, which means that replacement is an intensive, labor-heavy service requiring partial or full engine removal. What Needs to Be Done When timing chain wear is confirmed, the repair needs to be approached as a complete system, not simply “replace the chain” and call it a day. Depending on what the inspection reveals, this can include timing chains, guides, tensioners, seals, and other related components. We also inspect the surrounding areas for oil leaks and signs of wear while everything is accessible. Pro Tip: If you start hearing noticeable rattling on startup, the car develops timing fault codes, or you’re seeing unexplained oil leaks, don’t wait until the check engine light comes on. By that time, you might be dealing with a bigger problem. Result: A smooth ride and a happy driver. The goal isn’t just to quiet a noise or clear a code. It’s proper diagnostics to know the root cause and a proper mechanic who knows the proper repairs. Catch us every Friday for more shop talk. And remember: Good work ain’t cheap. Cheap work ain’t good. Euro Auto Tech & Smog | European Specialist | 7633 El Cajon Blvd #217, La Mesa, CA 91942
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