Question about 1995 Pontiac Grand Am

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Knocking or banging back side of engine some times top

Knocking or banging back side of engine some times in top, just off idle . problem is new, severe on rev, steady but not severe on steady rpm. erratic all ways

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Unfortunately, it sounds like you have a spun bearing. This is a severe engine problem that reqiures major engine work, if left unaddress it will destroy your engine.
Please note I underlined "sounds like", you need to have someone check the engine to make sure.

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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2007 Kia Optima with a 2.4L engine The engine started to knock when driving home. When I pulled over the noise was only apparent at the top of timing cover on the intake side.


yes this engine uses a hydraulic variable cam guide , it moves via oil pressure as engine moves faster ive seen this a few times that the actuator for this develops a oil leak (oil drains back down to pan not outside) and it no longer maintains a proper tension in cam drive chain , I suggest you have this further investigated to see if this is what has occurred , as it can develop into a very serious problem if let go too long , also your mention that there is slack in cam chain isn't a good sign either

Jan 06, 2017 | 2007 Kia Optima

1 Answer

Why is engine knocking?


the serpentine belt is an accessory drive belt --a/c --alternator--power steering--water pump--etc it does not have affect on timing ---if you have an engine knock while running that would more than likely be a "rod knock" "piston knock" from a burnt main bearing,piston wrist pin ,damaged rod --if your timing was off poor running ,misfire,no start ,banging in upper engine valves hitting piston,

Oct 06, 2015 | 2000 Pontiac Grand Prix GT

3 Answers

My acura is making loud banging noise from front when idling. sounds like a missing spark plug but all spark plugs are fine. what could it be?


Can be a lot of things.

Could be a bad rod or rod barring.

Could be a clearance issue in a rebuilt engine.

I wouldn't run it until you Take it to a shop for diagnostic.

Nov 03, 2014 | 1998 Acura CL

1 Answer

1998 Licoln Continental 4.6 liter VTech


The fact that you have indicated the knock is in a very specific area of the engine indicates to me that the knock is there while idling and with you listening with the hood open. Spark knock, the kind that is caused by using lower-than-recommended octane gasoline, usually only happens when the engine is under load, not at idle.
I think you have a mechanical problem - valves, lash adjusters, maybe the cam itself. Do a compression check. If you have valves not working properly or not closing properly, this should help you find the area to check for damage.

Mar 04, 2017 | 1998 Lincoln Continental

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Engine knocking noise


I currently own a 2003 isuzu rodeo that i purchased new in 2003 i recently changed the oil and was driving and heard a loud knocking / banging noise . I immediately pulled over and shut it off ,popped the hood and checked the oil only to find out i had plenty of oil. i asked a mechanic he told me to replace the oil pump and i did , but it still makes the same noise. it only has 80,000 miles what else could be wrong?

Jan 10, 2014 | Toyota 4Runner Cars & Trucks

1 Answer

Makes knocking noise that sound like something is loos banging only when jeep warms up and only in gear


TROUBLESHOOTING ENGINE NOISES
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 07, 2013 | Jeep Cars & Trucks

1 Answer

2008 oil leak and engine ticking


An engine used oil for lubrication and colling. If there is no oil then there is no lubrication. No lubrication means lots of heat and friction. Is it a ticking or banging noise? I do believe it is an ohc engine so it couldnt be a lifter ticking. It is probably a rod knocking. It so then it will more than likely need an engine

Mar 18, 2013 | 2008 Nissan Sentra 2.0

1 Answer

Have a 96 geo prizm that won't accelerate very well and is making a knocking sound any ideas?


knocking is a big thing, its a cry for help.
can be minor to horrific
knocking parked? or only driving.
in neutal or park?
knocking hot block, or cold block or both? at what RPM>/
only real oil pressure gauge works, not the idiot lamp
when the lamp comes on at 3-5psi, the war was lost.
my 96 makes 55psi cold just cranking, want a video of that?
find the knocking first.

if can ,be knocked , parked.?
id check oil pressure. real.
use a $5 stethoscope. find it.
drop all belts. to see if an accessory device knocks. (5min test max cold to start, yes, water pump dead)
PS/AC/ALT dead too.
still knock>
listen at valve cover. coming from there.
is the timing belt is old over 60k thy all shard and some knock load hitting that cover, it a for sure thing, skipping the 60k mile service point,
exhast header collerctor fange gasket , bad, allowing bang band bang as the 2 flanges pound themselves to death.
the top of the engine, see induction pips. (AIR) those mounts for sure can bang away, bolts missing.

knocking:
1 overheated the engine so bad its pinging? knocks up hills?
2: say exaclty when and not you get the knocks.

Dec 03, 2012 | 1996 Geo Prizm

2 Answers

Engine knocking.


Hi,my 92 prado started making a knocking sound recently,we couldn't pin it down to one spot in the engine.
The knocking was constant at low revs and then disapeared.
Turned out to be the tourque converter knob had bust of and eventually destroyed the fly wheel and the transmission pump.
Definatley check under top cover and also drop off the sump to check for loose nuts etc.
hope this helps.

Dec 27, 2008 | 1992 Toyota Land Cruiser

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