Engine & Internal Chat about beefing up your engine's insides here.

Knock in motor

  #1  
Old 01-17-2017, 02:05 PM
Junior Member
Thread Starter
Join Date: Dec 2015
Posts: 5
Default Knock in motor

2005 Camry w/4 cylinder and auto trans. About 2,000 miles ago I noticed a slight "rattling" at idle, when cold (45-50 degrees). After a couple "warm up " minutes the sound went away. It was an erratic rattle, not having a distinct cadence. Sounded a lot like other motors with a belt idler pulley going south. Just got a text from my wife stating that the rattle has evolved into a higher pitched continuous "knock" that she compared to spark knock (bad gas). She said there are no warning lights on dash and that the car still runs ok. I told her to get home and park it. I'm at work and am having no luck locating the service manual that I had downloaded. I vaguely remember reading that this motor has a timing chain, as opposed to a belt. Is it possible that I have a tensioner, or shoe, that has given up? The car has 165,000 miles on it and has had 5,000 mi oil changes since we bought it with 35,000 miles on it. Other than warping brake rotors, I have had no problems with it. Is there a recommended mileage interval for timing chain and/or tensioner replacement? Do my descriptions sound commonplace? Thanks in advance for any help.
 
  #2  
Old 01-17-2017, 11:10 PM
Super Moderator
Join Date: Jan 2008
Location: PTW
Posts: 11,739
Default

There is no recommended period replacing the timing chain or tensioner.

It is possible the guide on the tensioner wear out and the chain rattles.

The VVTi intake camshaft gear can also rattle.

Use a section of rubber hose as a stethoscope to narrow down the area of the noise.

Make sure noise is not a rod or bearing knock from inside the engine block.
 
  #3  
Old 01-18-2017, 07:30 PM
Junior Member
Thread Starter
Join Date: Dec 2015
Posts: 5
Default Update

Too busy to do the work, I took the car to a very trusted and previously visited independent shop. Within a few hours, a phone call revealed to me that two separate issues were at play. A bad water pump and a broken spring at the serpentine belt tensioner. 160,000+ miles and this is the first "slightly" major repair? I love my (wife's) Camry!
 
  #4  
Old 01-19-2017, 07:41 PM
Super Moderator
Join Date: Jan 2008
Location: PTW
Posts: 11,739
Default

Good job. Thanks for posting back with the fix.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
mirro79
Suspension, Brakes, Tires & Wheels
3
02-25-2009 04:22 PM
thecaveboy
General Tech
5
10-02-2008 01:13 PM
bfaidherbe
General Tech
0
07-07-2006 10:59 PM
jimb
General Tech
0
05-04-2006 12:35 PM
ajoan
General Tech
0
03-03-2006 01:25 PM


Thread Tools
Search this Thread
Quick Reply: Knock in motor


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.