Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • 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: Hello ben my car is making like a crack noise or some kind of noise everytime i turn and or accelerate. rattling coming from back

Hi Alex. Cracking noises are typically caused by metal to metal contact or a bushing that is pinching between metal components. On the front suspension, there are a few possible sources including steering stabilizer bar bushings, tie rod bushings, lower...

Q: How do I turn on or off the GPS clock?

When the GPS clock is turned on, the clock will automatically be updated via the GPS system. To turn on or turn off this feature, follow these easy steps: 1. Press the Setup button. 2. Press the System button. 3....

Q: Timing chain problem?

It could very well be a timing chain problem. The P0016 and 17 indicate that the camshaft sensors are sensing the camshaft in a position that does not logically correspond with the crankshaft. The P0302 and P0355 codes are misfire...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...