Question about 2004 Chevrolet TrailBlazer

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My fan is wobbly and it makes a knocking sound when I drive. When I'm stopped or idling it's louder and the engine seems like it's going to shut off. What can be wrong?

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Sound like your water pump is going bad..when the bearings go out it will wobble,,the next thing is it will start leaking..replace it

Posted on May 27, 2010

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If the fan is wobbling, even if the engine was running well, you should fix that. Either the fan clutch has failed or the water pump bearing is bad.
If it comes apart, it will do more damage and cost way more $ to repair.
Other running problem may or may not be related but do that first!!

Posted on May 27, 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

97 ford thunderbird 3.8 v6 has a very loud knock. any ideas?


First of all, stop driving it. Second of all, it may be that your oil pump may be going out, however unless you are a mechanic, I wouldn't go any further.

Jul 22, 2017 | 1997 Ford Thunderbird LX

1 Answer

Hi, recently after my last oil change i noticed that the engine on my 1999 ford escort has a knocking or pinging sound when i start or if idle for a few minutes it seems to stop while driving any...


First---Make sure your oil level is where it needs to be. If your car is driving fine and has no loss of power, then you probably have a defective knock sensor. It's hard to determine without more info on your vehicle, like mileage, compression, and oil pressure if your engine is "going bad"

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Ok. Last night my car started making a knocking noise. Its not loud and only happens when im in idle. Also it seems to come from the bottom of the engine. Help?


if it gets louder and faster as the engine speed increases then a piston is knocking...if it is just at idle like you said then it could be a bad oil pump if oil light is on at idle or it could be the connecting rod knocking on the crankshaft because it is loose.

Oct 23, 2010 | 1999 Pontiac Sunfire

1 Answer

The winning sound that gets louder with the acceleration could that be coming from a wobbly fan clutch, fan does not wobble when truck is off


If it's an engine related sound....it should be there when the truck is stopped...(running....not moving).
If it starts when the truck starts moving it's a 90% chance it is a bearing.
60% wheel bearing........20% rear end bearing....10% other.

Aug 17, 2009 | 2005 Chevrolet Trailblazer Ext

1 Answer

Loud clanking noises


It could be a loose heat shield on the exhaust system.They can sometimes come loose and rattle like crazy while idling.

Aug 04, 2009 | 2005 Saturn VUE

1 Answer

1997 mustang cobra engine ping


you have a rod knocking this is a serious problem the more you drive it the worse it will get
it could also be a warped push rod but thats a slim chance

May 01, 2009 | 1997 Ford Mustang Cobra

1 Answer

1979 cad fleetwood brougham knocking sound from,engine


Sometimes collapsed lifters or loose rocker arms can cause knocking sounds in an engine. However, the fact that there was a possible loss of oil pressure and that the knocking gets louder as the rpm's increase, would indicate that there is damage to a connecting rod bearing and possibly the crankshaft. If the latter is the case you are looking at a fairly substantial repair bill.

Apr 14, 2009 | 1990 Cadillac Fleetwood

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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