Question about 1996 Jeep Grand Cherokee

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Knocking noise when ideing and accelerating - 1996 Jeep Grand Cherokee

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A deep sounding knock is a main or rod bearing that is worn

Posted on May 11, 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

Knocking noise when accelerating


Very possible that the timing is out. Could be too advanced. If ok, possible bearing noise, low oil or exh. manifold gasket.

Sep 04, 2013 | Peugeot Cars & Trucks

1 Answer

2003 Merc ML 350 Knock Noise On Take Off


think it could be the gearbox mounting ,best advice is to ask a local mechanic and see what they say after a drive .

Nov 26, 2017 | Mercedes-Benz Cars & Trucks

1 Answer

Knocking noise car


Hello,

Sounds like your engine mounts need to be replaced. Thats a common issue on ML's hope that helps.

Jul 27, 2013 | Mercedes-Benz ML Cars & Trucks

1 Answer

Knocking noise start up and driving?


Sounds like a rod bearing knock.

Jun 12, 2013 | GMC Safari Cars & Trucks

1 Answer

Knocking noise from tires when accelerating


The noise may be your driveshaft ujoint going bad making the noise when you speed up,turn your driveshaft back and fourth by hand and see if it makes any noise. Jim Riley said that.

May 26, 2012 | 1994 Toyota Tercel

2 Answers

The engine has a nkockig sound..could this be caused by a bad knock sensor?


No it isnt a knock sensor the knock sensor job is to detect a knock noise and ****** timing. The knock that it is looking for is from octane or fuel or pinging that creates N0X s. A pollution gas. The knocking noise that you are hearing is different. If it is a multiple noise ar a rattling sound that will be the valves. There are other noises like a piston knock this knock is a sharp metallic noise, If the knock occurs only on acceleration that noise is a crankshaft noise. You need to check you oil level and make sure it is corrects. Look at the oil condition do you see silverish or whitish condition,is the oil deep black.

Apr 24, 2011 | 2004 Nissan Maxima

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

1 Answer

Accelerated clicking/knocking noise when i start driving


sounds like your CV joints are worn out. If the clicking noise gets worse when turning then its a definite possibility. Also check the CV joint boots for splits as this can quickly wear them out. The dust mixes with the grease to form a grinding paste.

Apr 07, 2009 | 2000 Hyundai Elantra

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