Question about 1993 Pontiac LeMans

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There's a knocking sound when I turn and also when I accelerate. Just replaced timing belt and aferwards the noise began.

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Is it a clicking sound when turning? clunk sound on accelerate my be broken motor mount, if clicking sound when turning sounds more of cv shaft

Posted on Feb 04, 2010

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Sounds like your cv joint mat be bad, is there grease being slung by your drive shafts ?

Posted on Feb 04, 2010

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Posted on Jan 02, 2017

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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

My Renault megane 2003 began juddering on the motorway doing around 70mph then the engine management light kept flicking on and off. I pulled over stop the engine turned all electrics off and restarted it,...


Check the timing belt. It should have been changed at 60,000 miles. Sounds like you have lost some teeth on the synchronous belt resulting in lost timing. Damage to valves can occur. look under plastic cover on the end of the head for the belt

May 29, 2017 | 2003 Renault Megane

1 Answer

Strange noise when accelerator is pressed...


Look for cracked and gummy vacuum hoses. It's time to see if any are in this condition or disconnected entirely.

Jul 28, 2017 | 1997 Mercury Tracer

3 Answers

Knocking noise when i accelerate


CHECK ALL DRIVE BELT ACCESSORIES LIKE ALTERNATOR - AIR CONDITIONER COMPRESSOR AND CRANKSHAFT PULLEY.I HAVE SEEN A LOOSE OR BAD TRANSMISSION MOUNT CAUSE KNOCKING NOISE IF ENGINE ACCELERATED.

Mar 01, 2010 | 1997 Honda Civic

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

3 Answers

Knocking noise coming from belt area. when belt


Had the same issue and it turned out to be the balancer. Not too difficult to fix any questions or advice, I am happy to help you. Justlet me know. Good luck

Jul 11, 2009 | 1992 Buick Century

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