Question about 1995 Chevrolet Lumina

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Knocking and pinging noise

After fixing trailing arm on vehicle, the motor starting knocking or pinging. the oil was milk colored and I replaced it with new oil. If it's still making the same noise do I have to put new lifters or pistons

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You might have a blown head gasket. The milky oil is an indication of water getting into it, which would point toward your head gasket. You should have a compression test done.

Posted on Jun 21, 2009

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2 Answers

I hear a knocking sound when ever I start my engine


check oil level if low add oil ---if oil milky in color like chocolate milk possible internal damage from --blown head gasket-damaged head --the knock from engine usually means that damage to a piston rod has occurred [rod knock] and knock usually doesnt throw an engine code and usually fatal to engine will need a mechanic to diagnose how bad or what extent the noise is with engine

Aug 09, 2016 | Cars & Trucks

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2005 Nissan Altima knocking noise when engine starts.


By chance did you check your oil level. That would be ideal before your engine blows out. If that is fine, more in likely it maybe normal. Some GM vehicles do that also due to the cold weather. After sitting for a long period of time the oil will settle in the oil pan til you crank up. The knocking noise may last for 5-10 sec then it stops because the oil is lubricating the pistons again. But if it is constant and oil level is good, get a mechanic to check it out. Hope this helps.

Nov 18, 2015 | 2005 Nissan Altima

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Engine knock when first starting


Hi there:
Firs t suggest to check this information about "engine noses"...
ENGINE CLICKING NOISES
A clicking or tapping noise that gets louder when you rev the engine is probably "tappet" or upper valvetrain noise caused by one of several things: low oil pressure, excessive valve lash, or worn or damaged parts.

First, check the engine dipstick to see if the oil level is low. If low, add oil to bring it back up to the full mark. Is the engine still noisy? Check your oil pressure. A low gauge reading (or oil warning light) would indicate a serious internal engine problem that is preventing normal oil pressure from reaching the upper valvetrain components. The cause might be a worn or damaged oil pump, a clogged oil pump pickup screen or a plugged up oil filter. Using too thick a viscosity of motor oil during cold weather can also slow down the flow of oil to the upper valvetrain, causing noise and wear.

COLLAPSED LIFTER NOISE
Worn, leaky or dirty lifters can also cause valvetrain noise. If oil delivery is restricted to the lifters (plugged oil galley or low oil pressure), the lifters won't "pump up" to take up the normal slack in the valvetrain. A "collapsed" lifter will then allow excessive valve lash and noise.

VALVE LASH NOISE
If you can rule out lubrication-related problems as a cause, the next step would be to remove the valve cover(s) and check valve lash. On older import engines, mechanical lifters require periodic valve lash adjustments (typically every 30,000 miles). Too much space between the tips of the rocker arms and valve stems can make the valvetrain noisy -- and possibly cause accelerated wear of both parts.

To measure (and adjust) valve lash, you need a feeler gauge. The gauge is slid between the tip of the valve stem and rocker arm (or the cam follower or the cam itself on overhead cam engines) when the piston is at top dead center (valve fully closed). Refer to a manual for the specified lash and adjustment procedure. Also, note whether the lash spec is for a hot or cold engine (this makes a big difference!).

On engines with hydraulic lifters, oil pressure pumps up the lifters when the engine is running to maintain zero lash in the valvetrain. This results in quiet operation. So if the rocker arms are clattering, it tells you something is amiss (bad lifter or worn or damaged parts) or the rocker arms need adjusting.

DAMAGED ENGINE PARTS NOISE
Inspect the valvetrain components. Excessive wear on the ends of the rocker arms, cam followers (overhead cam engines) and/or valve stems can open up the valve lash and cause noise. So too can a bent pushrod or a broken valve spring.

RAPPING OR DEEP KNOCKING ENGINE SOUND
Usually bad news. A deep rapping noise from the engine is usually "rod knock," a condition brought on by extreme bearing wear or damage. If the rod bearings are worn or loose enough to make a dull, hammering noise, you're driving on borrowed time. Sooner or later one of the bearings will fail, and when it does one of two things will happen: the bearing will seize and lock up the engine, or it will attempt to seize and break a rod. Either way your engine will suffer major damage and have to be rebuilt or replaced.

Bearing noise is not unusual in high mileage engines as well as those that have been neglected and have not had the oil and filter changed regularly. It can also be caused by low oil pressure, using too light a viscosity oil, oil breakdown, dirty oil or dirt in the crankcase, excessive blowby from worn rings and/or cylinders (gasoline dilutes and thins the oil), incorrect engine assembly (bearings too loose), loose or broken connecting rod bolts, or abusive driving.

Bearing wear can be checked by dropping the oil pan and inspecting the rod and main bearings. If the bearings are badly worn, damaged or loose, replacing the bearings may buy you some time. But if the bearings are badly worn or damaged, the crankshaft will probably have to be resurfaced - which means a complete engine overhaul or replacing the engine is the vehicle is worth the expense.

ENGINE PINGS OR KNOCKS WHEN ACCELERATING
The cause here may be Spark Knock (Detonation) caused by an inoperative EGR valve, overadvanced ignition timing, engine overheating, carbon buildup in the combustion chambers, or low octane fuel.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Nov 06, 2012 | Cars & Trucks

1 Answer

05 ford ranger started knocking then blew of radiator hose now it wont start


The knocking (as opposed to pinging) could indicate lack of oil or a bad oil pump. If it was the lack of oil then that, in turn, could cause overheating and a subsequent blown radiator hose. In addition, depending on how long you ran the engiine while it was knocking, you could have driven off a pistion rod cap while the pistion seized up in the cylinder. If the engine won't crank or cranks with some undesirable metal on metal noise you may have an engine job (or a new short block)in your future. My arm wave analysis may be modified by some additional information.

Aug 02, 2012 | 2005 Ford Ranger

1 Answer

Got very bad nock in motor all fluids and gages are good. Engine light is on


Did changing the oil cause your light to go on? You didn't say if the noise started all at once or if it has gotten louder over time.

Typically a knock not related to predetonation ("pinging") will typically come from the connection at the crankshaft to the piston connecting rod. A slapping sound may occur if the connecting rod pin is sloppy or part of a piston skirt is damaged. I had a 98 Durango but can't remember if you have hydraulic lifters. A bad lifter can also emit a knock. If you have more of a clatter check the rocker arms. It's also possible a pushrod is bent. Use a mechanics stethescope or metal rod and try to isolate the noise source. The precise location of the knocking will improve you odds of solving the problem.

Jan 08, 2012 | 1998 Dodge Dakota

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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.

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My 2000 dodge intrepid had a slight knock in the engine, and I'm getting a lot of white smoke from the tail pipe, what could be causing this problem?


CHECK THE OIL DIP STICK AND SEE IF IT LOOKS LIKE CHOCOLATE MILK IF SO THEN THE NOISE WOULD BE A BAD ROD BEARING THE WHITE SMOKE IS COOLANT GETTING IS A CYLINDER AND IT BURNING IT IFTHE OIL LOOKS LIKE MILK THAT IS FROM THE COOLANT IN THE OIL FROM THE HEAD GASKET DONT TRY TO FIX THAT MOTOR FIND ANOTHER ONE

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Knocking (Pinging) noise heard when car is in drive


check the vehicle knock sendor, are u using the right grade of gas, and oil for u temp zone

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90 Toyota 4Runner pinging noise


hi the pinging you here is ignition firing before it should but if you have a knocking noise i would suspect the worse but try doing a compression test first see if everything is in order then if this seems ok have you put fuel in it just before it started if so change your fuel if not see if the electrical system has a knock sensor if so run the engine and tap the block close to it see if engine revs drop if not replace but the knock is a piston best of luck yates210456

Oct 12, 2008 | 1990 Toyota 4Runner

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