Is there a recall on the 2000 5.3 engine due to piston slap?
Look into piston slap Read More
Do you mean piston slap? Noise like piston slap are repairable only by an engine rebuild. Read More
They do seem to have a tendency toward "piston slap" until the engine is warm. That's where the bottom skirt of the piston wears a little and becomes small enough to rock a couple thousandths of an inch at the bottom of the stroke. When the piston rocks quickly it makes a sound that is characteristic of piston slap. That's the bad news. The good news is, the engine can run several hundred thousand miles… Read More
Bad engine bearing? Piston "slap" Fuel Octane rating too low Read More
Why is there low oil pressure and a rapping noise inside the motor of my 1997 Yukon with 134 000 miles?
Engine internals worn Piston "slap" Rod "rap" Engine internals worn Piston "slap" Rod "rap" Read More
Yes Read More
Worn engine parts. Most likely a rod bearing is worn. Read More
Can a piston skirt slap noise be mis-diagnosed as a timing chain tensioner or cassette guide noise on a 1998 Ford Explorer anf if so what do you advise other than replace pistons?
Piston slap and timing chain related noises can be very similar. If it is a piston slap noise the noise may be louder during power braking and may quiet down as the engine warms up. Read More
What is wrong with 2000 Camry which now has knocking at 86000 miles wo spark plugs it is free of knocking and has equil compression wo visual damage to pistons walls motor dot Camry at yahoo dot com?
A knocking engine can mean any of a number of things, main bearings, rod bearings, wrist pinsw or piston slap. If it's just piston slap, you probably have a lot of miles left in the engine. Anything else means trouble. Does it have an oil pressure switch or an oil pressure gauge? If you have a gauge watch the oil pressure. If it's up at an idle you probably have piston slap or wrist pins… Read More
Gm used a short piston skirt on this year. The knock is piston slap that normally goes away when engine warms up. Sounds bad, but should not cause any problems. Read More
Typically.... Connecting rod bearing / crank bearing. But it could also be piston slap, or flywheel. Read More
Most likely you are hearing piston slap. Probably time for a new top end. Read More
Most probably the noise is piston slap, this noise is heard when the engine is cold and disappears when the engine is hot. if the slap is very strong when the engine is cold and the noise becomes less when hot but still the noise can be heard. Read More
The only way to fix piston slap is to replace them. Some oil additives will quiet them down some, there are several brands available. Read More
Will your engine knock if your try to drive it and you have a blown piston ring on a 1988 Chevy Silverado?
A bad ring would probably chatter in the cylinder and cause serious oil consumption. Knocking would most likely be either bearings (typically rod) or piston slap which is a common trait of a 350. Piston slap isn't serious as long as it clears up within a few seconds of starting the engine. Rod knocking means you get to rebuild/replace the engine or wait for a rod to go through the side. Read More
It's a 2.5 litre single overhead cam engine. 165 hp if I recall correctly. Watch out for excessive piston slap, head gasket failure, and fuel leak smells in cold weather, with the 2002 Subaru Outback. I got rid of mine. Read More
My 97 Chevy cavalier engines rattles until fully warmed up will going too 5w30 oil help or oil treatments?
Typically bearing rattle goes away in a second or two if that's what it is. Often piston slap will make noise until the engine warms up a little and it can sound a little like bad bearings. Typically, piston slap doesn't cause that much of a problem but changing the weight of the oil won't help. Piston slap occurs when the bottom skirt of the piston is worn a little and the piston can move… Read More
Often a knock when cold is caused by piston slap, which is pistons rocking in the cylinders until they expand in size when the engine warms up. Read More
It all depends on what KIND of knocking sound. Some people call it a knocking sound when the engine pings from pre-ignition. If that's what you have, check the knock sensor. A classic knocking sound is typically either worn bearings or piston slap. Piston slap is when there the skirt of the piston is a little small and it "pops" at the bottom of the stroke. Typically that sound goes away once the engine warms… Read More
piston slap is when the piston inside the cylinder is somewhat smaller than the cylinder bore. when the piston moves up and down, it ends up moving side to side too. this causes a knocking/slapping sound as the piston slams into the cylinder walls. this can cause harm if the play between the piston and bore are significant, otherwise it's nothing to worry about. if the car is hammering you might want to take it… Read More
No, a ticking noise could be lifters, rods, piston slap or who knows what else without hearing it. Read More
If it is a true engine knock then it is likely oil starvation or piston slap. Some folks hear "pinging" as engine knock but this is actually mistimed detonation in the cylinder caused by low octane or bad timing or other related tune factors. There is a theory out there that the 3.0 Nissan motors had some piston slap but I have not seen validation in my little world yet. My 3.3 is extremely quiet… Read More
1997 Chevy lumina 3.1 and it makes knocking noise coming from the engine when I start it It goes away after about 2 minutes what could this be?
The condition may possibly be piston slap. Read More
What could be the reason for the valves knocking on the initial starting of a 1995 Nissan Pathfinder?
Hydraulic lifters will rattle a little when the engine first starts if the oil has leaked out. Typically that doesn't take too long to go away. Often the knocking noise when an engine first starts is because of worn rod bearings or "piston slap". If there is too much gap in the rod bearings you'll have some knocking when you first start that will last until oil has filled the oil lines. Piston slap takes… Read More
Rings around one or more of the pistons have worn down to the point of letting the piston 'SLAP' around in the cylinder. So it is called 'piston slap'. It gets louder as the engine goes faster so you may not be able to hear it at idle. The only remedy I know if is a ring job. Otherwise you'll just have to drive slow and pour more and more oil into the engine between… Read More
Cold engine knock that goes away after warmup is usually piston slap. Worn pistons worn cylinder bores, wrong oil (too light) on a high mileage engine. Read More
are you sure is a valve noise?? or is a piston slap? Read More
If I understand your question, the noise that you hear is called "piston slap". It is not exactly a click, probably closer to a knock. This goes away on my 2000 Forester after just a few minutes of running even in the coldest weather. Turn the radio up a bit and enjoy your Subaru. --Ken Read More
depends on what kind of knocking you mean. lots of engines can have what we call "piston slap" when the engine is cold and goes away in a few minutes when the engine warms up. If the noise stays and is worse when revved up you have a more serious problem.Hope this helps Read More
Knocking is caused by preignition, where the heat in the cylinder causes the gas to ignite before the spark plug does. The noise could also be piston slap, which is caused by a worn cylinder wall. Try using a higher octane/grade gas and see if the noise goes away. In certain engines like the Malibu 3.1 liter and others, the knocking is caused by a piston rocking in the cylinder. This is called piston slap… Read More
1. It could be caused by the oil pump is worn. 2. It could be from worn rod bearings or piston slap in the bore from wear. 3. It could be oil is not getting to all parts of the engine at right pressure. Read More
If its gasoline it would be a problem in your head causing the piston to slap against the cylinder walls. If its a diesel engine then the knocking is caused by the .001 to .002 second delay between the fuel injector closing and the compression/combustion of the fuel Read More
If you have to ask,forget it, it`s cheaper to buy a used motor at a junk yard. Are you sure it`s not piston slap making the noise. I`ve had piston slap for the last 70,000 miles and still running strong. Read More
piston slap. very common Read More
i can answer that one the 3400 out of a 2000 grand am will slap right in. there are afew others including the 3400 out of the avalanche Read More
The only way to "check" a piston would be to remove it and visually inspect for damage and wear. Make certain that the piston is not cracked or otherwise damaged. check the ring grooves. Use a piston ring and a set of feeler gauges to determine the amount of wear. Excessive ring groove wear can result in piston failure and if the piston shatters, it can cause the engine to fail completely. Next, use a… Read More
9/10 it's timing. If in a combustion engine (assuming normal petroleum and not diesel) the spark plug ignites the petrol/air combination too soon or too late, the piston will slap against the cylinder head (commonly known as piston slap) as the crankshaft is not at top dead center (the absolute highest point that the piston will be within the cylinder before it starts downward) forcing the piston to have a lateral movement (side to side)… Read More
There is a real nice yet little known test for piston slap I'll pass along. Some test results can be mixed or ambiguous but this one is 100% and I've never seen it wrong after using it for the last 10 years. When the engine is cold, the aluminum piston is small in comparison to it's iron cylinder. Therefore the rather hollow slapping noise will be loudest first thing in the morning. After the engine… Read More
Lucas (oil additive) it and pray..if its a rod just drive it easy..if it is spark knock use better gas. answer the door sorry bout that, but if engine is knocking is it at idle, under load,etc knocking can be caused by piston slap,(worn out rings),bad bearings,or simply have engine tuned, all depends where knock is coming from Read More
It could be "piston slap" from worn pistons or partially collapsed hydraulic lifters. Those are the most common candidates but definitely not all possibilities. Read More
Not at all common, in fact very uncommon. Read More
most probably piston slap or little ends Read More
A great big YES!!! The cylinders must be bored-out to the next size. Read More
Could be many reasons, High mileage (worn out bearings), Poor or no maintenance (oil & filter changes), Abuse, Could also be a spark knock (pinging), Excessive piston cleareance(worn, piston slap)/cracked piston skirt can cause a knock noise. All of which are signs of major damage/repairs needed or potential damage if left unchecked. Read More
I ask the same question to GM and they told me that it is a cold motor piston slap and should go away once the motor is warmed up. The garage told me that it is normal and not to worry. Read More
Engines can make many different noises and people will describe them as knocks, pings, rattles or thumps. A true "knock" is caused by rod or main bearings hitting against the crankshaft. The general cause of that is either too much space between the bearing and crankshaft or insufficient oil pressure to maintain the distance between the bearing and crankshaft. Sometimes you can use a heavier grade oil so that the oil doesn't leak out of… Read More
Aluminum expands much more than Cast Iron, so when the piston to cylinder wal clearance is measured at room temperature there must an allowance to allow for expansion when the piston heats up. The amount of clearance depends upon the design of the engine and the anticipated operating temperature. Air-cooled engines run very hot so they require more clearance than water-cooled engines. On a Cushman piston the reference point for more clearance than water-cooled engines… Read More
It could be a number of things, like a broken or worn ring, or a leaking head or base gasket. If it happened suddenly, I'd suspect a broken ring. If it happened gradually, I'd suspect it's a wear issue. If it's accompanied by a noisy piston, (sometimes called, "piston slap") then I would suggest it's time for a top-end job. Good Luck Read More
Any engine can tick or have a slight knock or ping to it when it is cold. It's pretty normal. As an engine warms up the metal expands. Most of the time it's the valves/valvetrain. Some times it could be a bit of piston slap. Basically, as the valves expand when the engine gets up to temperature, the slack is taken out of it. I would suggest letting your car warm up before you drive… Read More
Either valve lifters or piston slap. Either way it should not be a huge problem if the problem goes away after the vehicle heats up. Use a high mileage oil, or an oil additive. If you are concerned have it evaluated by a reputable mechanic or a knowledgable friend. Read More