Question about 1998 Mazda Millenia

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I have a knocking sound,buy my valves,it dont knock at idle,

Some one told me it could be my timing belt tensioner,

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I HAD THE SAME PROBLEM. I HAVE A 98 MAZDA MILLENIA AND I TOOK IT TO A MECHANIC AND IT WAS THE TIMING BELT TENSIONER. IT COST ME ABOUT $250

Posted on Dec 26, 2008

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2001 crown vic leaks oil and makes knocking sound when i accelerate, what can this be and please dont say rod knock


Can be several things. I want to say spark knock. Don't remember if your engine came with a Knock sensor.

Also stretched timing chain or weak timing chain tensioner. Another term to look at is "valve rattle". This would give you closer to a machine gun sound than other things.

Mar 29, 2014 | 2001 Ford Crown Victoria

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Kia sorento 2012 produce sound look like power steering problem and it gets louder when ever I acceleration gear, so I took belt out and start the engin with no belt I found that sound was in engin!!


If its a knocking sound:

A KNOCKING SOUND IN THE ENGINE IS MOST LIKELY CAUSED BY ONE OF THE FOLLOWING
1. PISTON SLAP: Makes a sharp metallic noise. Idle engine and short out each cylinder plug. The noise will disappear when plug with bad piston is shorted. Noise will also disappear at acceleration. This can be caused by worn or out of round cylinder, or broken piston ring. Correct problem by re-boring cylinder and/or replacing piston.
2. VALVE NOISE: Makes clicking or rattle noise. Caused by excessive wear on valve stem or lifter, out of adjustment, or stuck valve. Correct by adjusting valve clearance, replace worn valve or lifter, regrind cam, replace valve guide and /or valve. A stuck valve can sometimes be loosened by passing oil through the carburetor while engine is running.

3. ROD BEARING KNOCK: Makes sharp metallic noise similar to a piston slap. Detection is opposite of piston slap. Rod knock is not heard at idle. Knock becomes louder as engine speed is increased. Caused by excessive rod bearing clearance. Correct by adjusting rod bearing clearance to .0015 inches by removing shims. May require re-pouring rod bearing.
4. REAR MAIN BEARING KNOCK: Makes dull knocking or thud noise. Detected at speeds between 20 and 50 MPH. Knock will normally decrease or disappear while pulling or decelerating. Noise will be detected the loudest at normal driving speed, when not pulling or decelerating. Correct by adjusting bearing clearance to .001 to .0015 inches. If knock is excessive, crank should be checked for out of roundness. May need to re-pour all main bearings to correct.
5. TIMING GEAR KNOCK: usually the most difficult to diagnose. If gear is loose or badly worn it will knock in all ranges. Run engine slightly above idle speed. Slowly open and close throttle. Knock will continue to be present, but just as engine slows down knock will become a slight rattle. Remove timing pin and reinsert into timing hole on timing gear cover. Press timing pin tightly against timing gear and accelerate slightly above idle. Knock will significantly be reduced or disappear. Correct by replacing both timing gear and crank gear as a matched set. The two gears should have a backlash clearance of .003 to .004. If more than .009 inch backlash, an oversize (.005) timing gear should be installed.
6. WRIST PIN SLAP: This can not be detected by shorting out the cylinder plugs. Rapidly accelerate and decelerate the engine speed. The engine will pass through a certain speed range when the wrist pin will rattle at about the same pitch as a valve tappet noise. This can be corrected by installing a new wrist pin bushing in the rod or new wrist pin f badly worn. Wrist pin should fit the piston and connecting rod with a tight metal to metal fit. The pin can be pushed into the piston and rod with a slight pressure of the hand. Pin to rod clearance is .0003 to .0005 inches.

Dec 15, 2013 | Kia Sorento Cars & Trucks

1 Answer

2000 Estima, 6 cylinder, makes a short whining noise on start up, also when placed into gear both forward and reverse - mainly when cold - makes a slight knocking sound that fades when you pick up speed,...


The whining noise at start up is either the power steering pump (possibly low fluid, or faulty pump bearing), or possibly a belt on the engine. As for the knocking sound, that is hard to diagnose without actually hearing it, but based on the fact that you are hearing a whining sound at start up, which is indicative of a loose belt, I would start at the belt tensioner and make sure that it is applying the correct amount of pressure on the belts. If the belt tensioner is faulty, it can make a knocking sound. If that is not the issue, then it could simply be the lifters. With engine run time/miles on the engine, internal engine components, such as lifters, valves, bearings and any moving part, deteriorate from friction wear and heat.They have a tendency to make a knocking/rattling sound when they are building up pressure. When they build sufficient pressure, or the engine reaches operating temperature, this sound/noise will dissipate and become nonexistent. This can be remedied by changing the oil, and possibly the weight of the oil (5w30, 10w40, 20w50) depending on your driving habits , or conditions (Highway v/s City/Stop&Go, or short trips under 30 miles)

I hope that you have found this information to be useful, and if I can be of any further assistance, please let me know. Thank you for using fixya!

Oct 01, 2013 | 1995 Toyota Previa

1 Answer

1998 eclipse 2.0 non-turbo i get this knocking wen i start the car but wen i drive it the knocking stops at 2000 rpm it sounds like its coming from the timing belt. i changed the water pump and timing belt...


Did you make sure the balance shaft belt was ok? Double check to make sure the timing belt is in time and tight. They have a two step tensioner that must be set in a certain order for correct timing.

May 19, 2010 | Mitsubishi Eclipse Cars & Trucks

1 Answer

I own a 2001 galant es 4cyl. automatic and started my car up 2 days ago and noticed a loud knocking noise coming from the engine. I opened the hood and the noise was coming from the area where the timing...


yoy could have a bad t belt tensioner or bad t belt pulley. get this looked into right away. you have what is known as an inteference engine. if you lose that belt for any reason, it WILL drop a valve, and your're looking at a lot of money for an job.

Sep 03, 2009 | Mitsubishi Galant Cars & Trucks

4 Answers

Knocking/pinging sound when stepping on the gas for power.


you will distroy the engine if you continue to let this noise happen.
the timing must be retarded to get the ping out if its that bad.
most of the time if its just a little bit though filling the tank with super unleaded will take out the noise.
the distributer must be loosend and turned in the correct way to ****** the timing and the idle must be put back up to compensate.
the distributer is the ignition timing.
the other thing that could have happend is the timing may have jumped time on the timing belt itself.this is a complely different timing.
this timing is valve timing.
the distributer is ignition timing.
when the distributer is turned you are changing the ignition timing .
you say in your text and i quote .

The service tech only adjusted the distributor fas far as he could to lower the idle.

a tech should never be turning the distributer to lower the idle nor should this be explained in any way to the customer.

if a tech says he dosent understand something stop them rightaway and get your car out of there or get someone else to talk to .
10 times out of 10 if the tech dosnet get it the car wont get it either.
have a competent service tech test and conferm the timing belt or chain timing .

keep me posted
joelmitchell1@hotmail.com

thank you
jm

Jul 29, 2009 | 1995 Nissan Pathfinder

1 Answer

TENSIONER bolt has broken off of the TENSIONER pulley


your daewoo does not have an interference engine which means that if timing belt slips or breaks there wont be any valve or piston damage

May 26, 2009 | 2000 Daewoo Nubira

5 Answers

1993 Isuzu Rodeo engine tick at idle and other


a very common problem with these engines is a clicking sound in the engine, it can be a slight annoying click, to a loud knocking sound. I end result is usually the same, replace your timing belt and tensioner. I researched this problem when i bought mine, and it was knocking. i replaced the timing belt, (which was loose) and actually took the tensioner apart and cleaned it (not recommended for the mechanically challenged). new tensioners may be tought to find. when i put it all back together, it ran smooth and quiet.

Jul 16, 2008 | 1992 Isuzu Rodeo

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