Q: Changed timing chain guide and tensioner. Now car starts good sounds good until warm them starts to make loud knocking. 2004 Nissan Maxima

asked by on

Why would it knock only when warm. Any suggestions what it could be. Thanks

My car has 130000 miles.
My car has an automatic transmission.

Hello - the most common cause of engine knock when the engine is warm, is worn connecting rod or crankshaft bearings. Hot engine oil provides less "cushion" for these moving surfaces, which results in a hard knocking sound. If the engine knock is new following the timing chain tensioner, it is possible the tensioner repair was not done correctly. The tensioner use engine oil pressure as well, and if a tensioner was incorrectly installed and leaks oil pressure, bearing knock in other parts of the engine could result. I would recommend an inspection of the engine by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Changed timing chain guide and tensioner. Now car starts good sounds good until warm them starts to make loud knocking. 2004 Nissan Maxima

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Car won't start

No start situations are difficult to diagnose because of all the variable involved. Cranking but not starting can be caused by many things like a faulty fuel pump, bad crank or cam sensor, an active theft deterrent system, etc. With...

Q: muffler loud hole in can

If your muffler has a hole in it, this will cause an exhaust leak. Sometimes mufflers can be patched but most of the time they will require replacement in order to resolve the exhaust leak issue. Mufflers range in cost...

Q: Q: Car leaks oil after oil change

I recommend having a certified technician, such as one from YourMechanic, come out to your car's location to run a diagnostic inspection of your oil leak, and suggest the best path to repair.

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.