Question about Subaru Impreza WRX STi

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2nd gear makes knocking noise while moving and gets louder and faster while eccelerating

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Hi sounds like the second gear synchro is buggered

Posted on Apr 08, 2011

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1997 cutlass supreme started making a knocking noise could it be oil pan


constant heavy knock that gets louder and faster with increased rpm
possible big end bearing failure
if it just happened as you drove over the gutter and it knocked could be a suspension part loose

Oct 01, 2016 | 1997 Oldsmobile Cutlass Supreme

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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

Clicking noise , what is it , and how do i fix it?


I had this noise and found that the fan shroud was being hit by the fan. Renoved the fan shroud and the noise stopped. The shroud had broken into two pieces.

Oct 12, 2012 | 1995 Jeep Cherokee

1 Answer

Knocking sound from the front of my manual 1999 nissian altima


need to determine if its engine or drive train see if the noise stays when you coast or is it in the transmission could be anything from a gear issue to clutch issue may be a driveline issue noise coming from your wheels you need to find the general location of the noise then you can center the issue

Sep 18, 2012 | 1999 Nissan Altima

1 Answer

I HAVE 02 TRAILBLAZER LTZ, AND IT JUST STARTED MAKING A KNOCKING SOUND THAT SEEMS TO COME FROM ENGINE. THERS IS NO CHECK ENGINE LITE, IT IS NOT LOW ON OIL. YOU CAN HERE KNOCKING SOUND AT IDEL SPEED AND...


Hello, I see you have a trailblaber with a knocking noise. It sounds like you have an electric fan clutch issue. Believe it or not your vehicle has an electric fan clutch. It looks just like the older non-electric but if you look on the driver side of the fan shroud that is the wire connector you see. It is an exspensive part just for the clutch but thats exactly what you are describing. It doesn't get louder just fast with rpms. Please rate my answer, Thank you

Mar 06, 2009 | 2002 Chevrolet TrailBlazer

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